1-5 July 2019

The University of Manchester

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- pascos2019@manchester.ac.uk
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Displaying 135
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135

Presented by Prof. Vincenzo BRANCHINA
on
4 Jul 2019
at
11:20

Type: oral presentation
Session:
Parallel: Collider Probes of New Physics
Track: Collider Probes of New Physics

Motivated by possible theoretical extensions to the standard model, hidden photons (HP) are a candidate for the cold dark matter. Their possible masses cover a broad range, from 10^-12 to 10^6 eV/c^2[1]. Large scale direct detection experiments such as LUX-ZEPLIN (LZ), built primarily to detect WIMPs, are also sensitive to HP dark matter via the so-called hidden photoelectric effect in the keV/c^2
... More

Presented by Mrs. Athoy NILIMA
on
4 Jul 2019
at
15:30

Type: oral presentation
Session:
Parallel: String Theory and Alternatives
Track: String Theory and Alternatives

Quantum decay of false vacuum states via the nucleation of bubbles may have played an important role in the early history of our Universe. For example, in multiverse models that utilize false vacuum eternal inflation, the Big Bang of our observable Universe corresponds to one of these bubble nucleation events. Further, our observable Universe may have undergone a series of symmetry-breaking firs
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Presented by Dr. Jonathan BRADEN
on
2 Jul 2019
at
14:50

Presented by Prof. Cumrun VAFA
on
5 Jul 2019
at
09:35

Type: oral presentation
Session:
Parallel: Neutrinos and Non-Accelerator Probes of New Physics
Track: Neutrinos and Non-Accelerator Probes of New Physics

The implications of the Dark-LMA solution to the solar neutrino problem for neutrino-less double beta decay will be discussed. It will be shown that while the predictions for the effective mass governing neutrino-less double beta decay remains unchanged for the inverted mass scheme, that for normal ordering becomes higher for the Dark-LMA parameter space and hits into the ``desert region'' bet
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Presented by Prof. Srubabati GOSWAMI
on
1 Jul 2019
at
14:50

Type: oral presentation
Session:
Parallel: Particle Physics Models of New Physics
Track: Particle Physics Models of New Physics

We investigate the baryon asymmetry in the supersymmetry Dine-Fischler-Srednicki-Zhitnitsky axion model without R-parity. It turns out that the R-parity violating terms economically explain the atmospheric mass-squared difference of neutrinos and the appropriate amount of baryon asymmetry through the Affleck-Dine mechanism. In this model, the axion is a promising candidate for the dark matter and
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Presented by Mr. Kensuke AKITA
on
2 Jul 2019
at
14:50

Type: oral presentation
Session:
Parallel: Collider Probes of New Physics
Track: Collider Probes of New Physics

Precision electroweak data, a light higgs and LHC searches for new spin one particles are all very constraining on technicolor models. We use a holographic model of walking techicolor (WTC) gauge dynamics, tuned to produce a light higgs and low S parameter, to estimate the range of possible vector(ρ) and pseudo-vector(A) resonance masses and couplings as a function of the number of colours and th
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Presented by Prof. Nicholas EVANS
on
2 Jul 2019
at
14:50

Presented by Prof. Daniel LITIM
on
1 Jul 2019
at
11:55

Type: oral presentation
Session:
Parallel: Particle Physics Models of New Physics
Track: Particle Physics Models of New Physics

We discuss how the Standard Model becomes scale invariant at the quantum level above a certain value of the Higgs field value without addition of new degrees of freedom.
We see some cosmological consequences of this setup, especially, absolute stability of the electroweak vacuum can be realized even with the current central experimental value of the top quark mass.

Presented by Dr. Kengo SHIMADA
on
1 Jul 2019
at
14:50

Type: oral presentation
Session:
Parallel: Particle Physics Models of New Physics
Track: Particle Physics Models of New Physics

I discuss asymptotically safe extensions of the Standard Model with new matter fields at the TeV scale. The BSM sector contains singlet scalars and vector-like fermions in representations which permit Yukawa interactions with the Standard Model leptons and a Higgs portal coupling. Phenomenological implications are explored including production and decay mechanisms, charged lepton flavour violation
... More

Presented by Mr. Tom STEUDTNER
on
1 Jul 2019
at
15:30

Type: oral presentation
Session:
Parallel: String Theory and Alternatives
Track: Cosmological Probes

We offer a geometric interpretation of attractor theories with singular kinetic terms as a union of
multiple canonical models. We demonstrate that different domains (separated by poles) can drastically
differ in their phenomenology. We illustrate this with the help of a "master model'' that leads to
distinct predictions depending on which side of the pole the field evolves before examining the
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Presented by Dr. Sotirios KARAMITSOS
on
1 Jul 2019
at
15:50

Presented by Dr. Byeong Rok KO
on
3 Jul 2019
at
11:55

Presented by Prof. Pran NATH
on
4 Jul 2019
at
10:45

It is a well-known fact that compact gravitating objects admit bound state configurations for massive bosonic fields. In this work we describe a new class of superradiant instabilities of axion bound states in neutron star magnetospheres. The instability arises from the mixing of axion and photon modes in the magnetic field of the neutron star which extract energy from the rotating magnetosphere.
... More

Presented by Dr. Francesca DAY
on
2 Jul 2019
at
16:40

Type: oral presentation
Session:
Parallel: Collider Probes of New Physics
Track: Collider Probes of New Physics

I discuss findings from my recent comparison of Bayesian and frequentist approaches to resonance searches (1902.03243). I introduce a counting experiment based on a search for the Higgs boson from which I generate pseudo-data. With that pseudo-data, I contrast the evolution of the $p$-value and posterior as we accumulate data and directly compare global $p$-values and the posterior of the backgrou
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Presented by Dr. Andrew FOWLIE
on
2 Jul 2019
at
15:30

We study the relation between the supersymmetry breaking patterns and the gauge couplings, prepotential of four-dimensional $\mathcal{N}=2$ gauged supergravity. The model contains multiple (Abelian)
vector multiplets and a single hypermultiplet which parametrizes SO$(4,1)/{\rm{SO}}(4)$ coset. We derive the expressions of two gravitino masses under the general gauging based on the embedding tensor
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Presented by Dr. Shuntaro AOKI
on
1 Jul 2019
at
18:00

The Belle II experiment at the SuperKEKB energy-asymmetric $e^+ e^-$ collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is $8\times 10^{35}$ cm$^{-2}$s$^{-1}$ and the Belle II experiment aims to record 50 ab$^{-1}$ of data, a factor of 50 more than its predecessor. With this data set, Belle II will be able to measure the
... More

Presented by Alberto MARTINI
on
2 Jul 2019
at
16:40

Bouncing cosmological solutions are found in a simple model of Einstein gravity coupled non-minimally to a self-interacting real scalar field. The characteristics of the solutions are presented and analyzed with an effective potential as a central tool. Bouncing solutions exist for the Higgs-like self interaction which is bounded from below, contrary to previous claims in favor of unbounded potent
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Presented by Prof. Yosef VERBIN
on
1 Jul 2019
at
15:50

We find a class of solutions for a homogeneous and isotropic universe in which the initially expanding universe stops expanding, experiences contraction, and then expands again (the "bounce"), in the framework of Einstein gravity with a real scalar field without violating the null energy condition nor encountering any singularities. Two essential ingredients for the bouncing universe are the posi
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Presented by Dr. Takahiro TERADA
on
1 Jul 2019
at
17:20

Presented by Prof. George EFSTATHIOU
on
5 Jul 2019
at
11:55

Deviations of the CMB spectrum from a black-body are a powerful probe of the three-point function of curvature perturbations. Dissipation of acoustic waves in the photon-electron-baryon fluid heats the plasma: the heating is not balanced by an appropriate change in photon number, and a Bose-Einstein spectrum is formed. A non-zero three-point function of curvature perturbations makes the heating ra
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Presented by Mr. Giovanni CABASS
on
1 Jul 2019
at
16:40

I will introduce our recent proposal that the state of the universe does *not* spontaneously violate CPT. Instead, the universe after the big bang is the CPT image of the universe before it, both classically and quantum mechanically. The pre- and post-bang epochs comprise a universe/anti-universe pair, emerging from nothing directly into a hot, radiation-dominated era. CPT symmetry selects the
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Presented by Latham BOYLE
on
1 Jul 2019
at
14:30

I will briefly explore the definition and limitations of the Cold Dark Matter (CDM) paradigm before introducing Generalised Dark Matter (GDM), an approach that subsumes the CDM paradigm. GDM facilitates well-defined model-independent observational constraints on the cosmological dark matter, including null tests of CDM. I will present some constraints that have been obtained using a combination of
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Presented by Dr. Daniel THOMAS
on
2 Jul 2019
at
17:40

The Belle II experiment at the SuperKEKB energy-asymmetric $e^+ e^-$ collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is $8\times 10^{35}$ cm$^{-2}$s$^{-1}$ and the Belle II experiment aims to record 50 ab$^{-1}$ of data, a factor of 50 more than its predecessor. From February to July 2018, the machine has completed a
... More

Presented by Alberto MARTINI
on
1 Jul 2019
at
17:40

We explore an extension to the Standard Model which incorporates a vector field in the fundamental representation of SU(2)L as the only nonstandard degree of freedom. We study the model in which a Z2 symmetry is manifest, making the neutral CP-even component of the new
vector field a vectorial dark matter candidate. We constraint the parameter space through LEP and LHC data, as well as from curre
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Presented by Dr. Felipe ROJAS ABATTE
on
1 Jul 2019
at
14:50

Type: oral presentation
Session:
Parallel: Neutrinos and Non-Accelerator Probes of New Physics
Track: Neutrinos and Non-Accelerator Probes of New Physics

In this talk, we introduce a new mechanism of direct baryogenesis by baryon number violating effective operator which is analogous to neutron-antineutron oscillation after electroweak symmetry breaking. Sufficient amount of the baryon asymmetry can be produced through the flavor oscillation after inflaton/moduli decay by the operator during the energy loss processes. We also suggest the mechanism
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Presented by Dr. Hiroyuki ISHIDA
on
1 Jul 2019
at
17:20

The Two Higgs Doublet Model (2HDM) is an extension of the Standard Model (SM) of particle physics in which one additional complex scalar doublet is introduced into the theory. The extension to a non-minimal Higgs sector produces several new features beyond the SM. One such feature is that the 2HDM can have non-trivial vacuum topology predicting 3 distinct domain wall solutions from the breaking of
... More

Presented by Mr. Dominic VIATIC
on
2 Jul 2019
at
14:30

Type: oral presentation
Session:
Parallel: Neutrinos and Non-Accelerator Probes of New Physics
Track: Neutrinos and Non-Accelerator Probes of New Physics

Neutrinoless double beta decay can significantly help to shed light on the issue of non-zero neutrino mass, as observation of this lepton number violating process would imply neutrinos are Majorana particles. However, the underlying interaction does not have to be as simple as the standard neutrino mass mechanism. The entire variety of neutrinoless double beta decay mechanisms can be approached ef
... More

Presented by Dr. Frank DEPPISCH
on
2 Jul 2019
at
15:10

Several modern theories hypothesize that dark matter condenses to a superfluid phase around galaxies. If true, one key distinction from particle dark matter is dynamical friction, a process by which a massive perturber moving through a cloud of matter is slowed by the gravitational attraction to its own wake. I will describe the steady-state dynamical friction of a perturber moving through a sup
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Presented by Dr. Benjamin ELDER
on
2 Jul 2019
at
17:40

We revisit the effects of an early matter dominated era on gravitational waves induced by scalar perturbations. An early matter dominated era is a period during which the energy density of a massive field dominates the Universe before the reheating. We carefully take into account the evolution of the gravitational potential, source of the gravitational waves, around the transition from an early ma
... More

Presented by Mr. Keisuke INOMATA
on
2 Jul 2019
at
14:50

Presented by Prof. Masahito YAMAZAKI
on
1 Jul 2019
at
11:20

The observation of neutral long-lived particles at the LHC would reveal physics beyond the Standard Model and could account for the many open issues in our understanding of our universe. Long-lived particle signatures are well motivated and can appear in many theoretical constructs that address the Hierarchy Problem, Dark Matter, Neutrino Masses and the Baryon Asymmetry of the Universe.
With th
... More

Presented by Audrey KVAM
on
4 Jul 2019
at
14:50

Galactic-scale structures can play an important role in pinning down dark matter properties. While weakly interacting massive particles (WIMPs) behave as cold dark matter on galactic scales, it is known that many beyond-WIMP candidates suppress the linear matter power spectrum. Though the suppression has been traditionally parametrized by a single parameter, thermal warm dark matter mass, the actu
... More

Presented by Dr. Ryusuke JINNO
on
1 Jul 2019
at
15:30

We study in detail simple extension of the freeze-in mechanism based on kinematically forbidden production of dark matter through plasma effects. Focusing on Higgs portal model, where the dark matter is produced via forbidden decays of a scalar coupled to the Higgs, current and future collider, cosmological, and astrophysical probes are considered.

Presented by Dimitrios KARAMITROS
on
2 Jul 2019
at
15:50

In this talk, we will discuss the current status and future prospects of a recently approved experiment to search for light new physics particles produced in the far-forward region of the LHC, namely FASER, the ForwArd Search ExpeRiment. FASER has been proposed to supplement traditional experimental programmes searching for heavy new physics particles in the high-pT region and, therefore, to incre
... More

Presented by Dr. Sebastian TROJANOWSKI
on
4 Jul 2019
at
15:10

We discuss the question of frame equivalence of scalar-tensor theories in the path integral approach. We find that due to diffeomorphism invariance of the background geometry, the path integral measure must depend non-trivially on the metric. Under a change of frames, this induces new finite pieces in the Quantum Effective Action that must be taken into account to preserve frame equivalence at the
... More

Presented by Dr. Mario HERRERO-VALEA
on
2 Jul 2019
at
18:00

Motivated by an alternative description of the Higgs sector, we present an non-Hermitian but PT-symmetric extension of scalar-QED. This extenion involves an imaginary mixing mass term for scalars, but keeps real energies.
Fundamental concepts of field theory must be questioned in this approach, like the derivation of the equations of motion, Noether's theorem, gauge invariance, the definition of
... More

Presented by Dr. Jean ALEXANDRE
on
1 Jul 2019
at
15:50

Presented by Prof. Qaisar SHAFI
on
4 Jul 2019
at
11:55

In scale-invariant theories of gravity the Planck mass, which appears due to spontaneous symmetry breaking, can represent the only energy scale at the classical level. We discuss the possibility for the second scale, associated with the Higgs vacuum expectation value, to be generated by a quantum non-perturbative gravitational effect. The new scale can be orders of magnitude below the Planck scale
... More

Presented by Dr. Andrey SHKERIN
on
1 Jul 2019
at
15:10

Heavy neutrinos appear in many models of neutrino masses and mixing. In this talk, I will present a new search
strategy at hadron colliders based on dynamical jet vetoes. This increases the sensitivity of the trilepton + missing
transverse energy search by an order of magnitude and allows future colliders to search for heavy neutrinos with a mass of 10 TeV and above.

Presented by Dr. Cedric WEILAND
on
2 Jul 2019
at
18:00

We study the monopole dark matter (MDM) emerging from a spontaneous breakdown of non-abelian gauge symmetry in the hidden sector. We assume that this hidden MDM was produced as a topological defect during a second-order phase transition in the early universe, and its stability is guaranteed by the topological nature. In particular, we introduce an axion-like particle (ALP), which mediates the inte
... More

Presented by Mr. Shu-Yu HO
on
2 Jul 2019
at
17:40

Presented by Prof. Marcela CARENA
on
4 Jul 2019
at
09:00

Session:
Parallel: Particle Physics Models of New Physics
Track: Particle Physics Models of New Physics

Light dark matter coupled to quarks must be treated through the effective couplings to mesons, which is implemented through the chiral lagrangian. We find the expected photon spectrum from the decay of the hadrons.
We compare to current and future observations, and show
that there is a significant discovery reach for such models of light dark matter.

Presented by Prof. Arvind RAJARAMAN
on
2 Jul 2019
at
17:20

Several recent proposals to embed inﬂation into high-energy physics rely on inﬂationary dynamics characterized by a strongly non-geodesic motion. This in turn relaxes the conditions of slow-roll to allow for potentials that are steep in Planck units, a welcome feature in view of the eta problem and the recently much discussed swampland conjectures.
In this talk I will present a general fram
... More

Presented by Dr. Jacopo FUMAGALLI
on
1 Jul 2019
at
14:50

Presented by Prof. Andrei LINDE
on
2 Jul 2019
at
09:00

Could gravitational waves open the door to observe quantum gravity? In this talk I provide an initial answer, and show that results are quite promising. Recent developments in the effective field theory of quantum gravity uncovered the low-energy structure of the effective action in curved space. The long-distance portion of quantum loops manifests in a set of parameter-free non-local operators, w
... More

Presented by Dr. Basem ELMENOUFI
on
2 Jul 2019
at
15:50

In this talk I will discuss how different inflationary models are sensitive to inhomogeneities in the initial scalar field profile. In particular I will demonstrate that convex potentials always support large inhomogeneities and are more robust than concave ones. We developed a prescription to predict when a concave inflationary potential fails and I will show how it can be used to infer the initi
... More

Presented by Josu C. AURREKOETXEA
on
1 Jul 2019
at
15:30

I discuss the possibility of exponentially large cross-sections in field theories. Such effects were recently suggested to be present in theories with higgs mechanism, leading to exciting effects both for experimental observation and theoretical properties of the QFT. I will comment on the problems arising if this effect is really present, and discuss why it is hard to expect any exponential cro
... More

Presented by Dr. Fedor BEZRUKOV
on
2 Jul 2019
at
15:50

Observations have offered strong support for the theory of inflation, but many details of the physics of the early Universe are still unknown. An observation of primordial isocurvature modes would change our view of the early Universe and point towards multi-field inflation. In this talk, I will describe some recent work towards the calculation of second-order effects from isocurvature modes,focus
... More

Presented by Pedro CARRILHO
on
1 Jul 2019
at
18:00

Based on numerical lattice simulations, I discuss the impact of the geometrical destabilization of inflation on the inflationary trajectory and show, that it can significantly change the inflationary predictions. Geometrical destabilization is a phenomenon in which the non-inflationary degrees of freedom are destabilized due to negative curvature of the fields space manifold affecting the evolutio
... More

Presented by Michal WIECZOREK
on
1 Jul 2019
at
17:00

Lepton number violation is notoriously difficult to observe with left-handed sneutrinos as sneutrino-antisneutrino oscillation requires the sneutrinos to be nearly degenerate. This situation is alleviated with right-handed sneutrinos. We discuss the possibility of observing lepton number violating sneutrino decays in the NMSSM extended with right-handed neutrinos. If higgsinos are lighter than sne
... More

Presented by Dr. Harri WALTARI
on
1 Jul 2019
at
17:00

We investigate the performance of T2HK in the presence of a light eV scale sterile neutrino. We study in detail its influence in resolving fundamental issues like mass hierarchy, CP-violation (CPV) induced by the standard CP-phase delta13 and new CP-phase delta14, and the octant ambiguity of theta23. We show for the first time in detail that due to the impressive energy reconstruction capabilities
... More

Presented by Dr. Sabya Sachi CHATTERJEE
on
4 Jul 2019
at
14:50

The possibility of a light charged Higgs boson H± that decays predominantly to quarks (cs and/or cb) and with a mass in the range 80 GeV ≤mH±≤90 GeV is studied in the context of Three-Higgs-Doublet Models (3HDMs). At present the Large Hadron Collider (LHC) has little sensitivity to this scenario, and currently the best constraints are from LEP2 and Tevatron searches. The branching ratio of H
... More

Presented by Mr. Muyuan SONG
on
2 Jul 2019
at
17:00

We present limits on several Dark Sector models obtained by BaBar.
Primarily designed for the study of CP violation in B mesons, this experiment is also, thanks to the high luminosity delivered and its powerful particle identification, sensitive to many other interesting physics processes.
These include production of visible and invisible dark photons, for which. our limits rule out the param
... More

Presented by Prof. Roger BARLOW
on
1 Jul 2019
at
15:50

In this talk we present the comprehensive numerical analyses and the analytic
one-loop results for the low-energy observables, $(g-2) _\mu$, $\mu \to e \gamma$, and $\mu \to e$ conversion in the Minimal R-symmetric Supersymmetric Standard Model (MRSSM).
The interplay between the three observables is investigated
as well as the parameter regions with large $(g−2) _\mu$.
A striking diffe
... More

Presented by Dr. Hyejung STOECKINGER-KIM
on
1 Jul 2019
at
17:20

The magnetic monopoles are, among other theoretical arguments, motivated by the electric-magnetic symmetry of the Maxwell equations and the quantisation of the electric charge. The Large Hadron Collider offers an ideal opportunity to produce and detect these hypothetical particles in the low-mass regime. General-purpose experiments, such as ATLAS, as well as ones dedicated to the search for (meta-
... More

Presented by Dr. Vasiliki MITSOU
on
4 Jul 2019
at
09:35

Classification of Dark Matter (DM) models is the key for the consistent exploration of DM model space and comprehensive probe of DM nature at current and future experiments. We perform systematic classification of Minimal Consistent DM (MCDM) models -- gauge invariant, renormalisable and anomaly free models -- in terms of DM and mediator weak multiplets. MCDM represents a natural building block
... More

Presented by Mr. Daniel LOCKE
on
2 Jul 2019
at
15:30

We present a simple extension of the Standard Model that contains, as the only new physics component, a massive spin-one matter field in the adjoint representation of SU(2)L. In order to be consistent with perturbative unitarity, the vector field must be odd under a Z2 symmetry. Radiative corrections make the neutral component of the triplet (V0) slightly lighter than the charged ones. We show tha
... More

Presented by Prof. Alexander BELYAEV
on
1 Jul 2019
at
14:30

The mirror dark matter model accommodates dark matter in a hidden sector which is isomorphic to the Standard Model, containing mirror partners of Standard Model particles. A weak kinetic mixing interaction allowed by the symmetry between the two sectors gives interactions between charged ordinary and mirror particles. The LUX dark matter direct detection experiment would be sensitive to electron r
... More

Presented by Ms. Elizabeth LEASON
on
1 Jul 2019
at
17:00

Sterile neutrinos is one of the possible physics beyond the Standard
Model motivated by neutrino oscillations. Stable at cosmological
time-scale sterile neutrinos may serve as dark matter. Typically, with
mass in keV range, the sterile neutrinos form Warm dark matter and
radiatively decay in galaxies providing X-ray telescopes with a
prominent signature. Extensive searches for the sterile neu
... More

Presented by Prof. Dmitry GORBUNOV
on
2 Jul 2019
at
17:20

We revisit the simplest model of Higgs portal fermionic dark matter. The dark matter in this scenario is thermally produced in the early universe due to the interactions with the Higgs boson which is described by a non-renormalisable dimension-5 operator. The dark matter-Higgs scattering amplitude grows as ∝s√, signalling a breakdown of the effective description of the Higgs-dark matter intera
... More

Presented by Mr. Shyam BALAJI
on
1 Jul 2019
at
15:10

Presented by Dr. Joseph PRICE
on
3 Jul 2019
at
11:20

Presented by Prof. Jose W. F. VALLE
on
3 Jul 2019
at
10:45

We explore the possibility that dark matter interactions with Standard Model particles are dominated by interactions with neutrinos. We examine whether it is possible to construct such a scenario in a gauge-invariant manner. We first study the coupling of dark matter to the full lepton doublet and confirm that this generally leads to the dark matter phenomenology being dominated by interactions wi
... More

Presented by Dr. Arsenii TITOV
on
1 Jul 2019
at
15:50

Presented by Prof. Alexei SMIRNOV
on
3 Jul 2019
at
09:00

A non-relativistic theory effective field theory (NREFT) offers a bottom-up framework to classify Dark Matter (DM) - nucleon interactions relevant for scattering at direct detection experiments by organising the interactions in powers of the momentum transfer $ \vec{q} $. This approach generates a number of operators including P-odd and T-odd operators, which require that the relativistic theory g
... More

Presented by Mr. Rahul MEHRA
on
1 Jul 2019
at
14:30

If a component of dark matter is millicharged, dark matter-baryon scattering can induce large effects in the 21-cm global signal by cooling the baryons. This can be achieved without being excluded by other cosmological, astrophysical or terrestrial constraints. We point out two important effects which have been overlooked in previous analyses. First, introducing a dark interaction between the mill
... More

Presented by Dr. Hongwan LIU
on
2 Jul 2019
at
17:00

In this talk, we present whether the new ekpyrotic scenario can be embedded into ten-dimensional supergravity. We use that the scalar potential obtained from flux compactifications of type II supergravity with sources has a universal scaling with respect to the dilaton and the volume mode. Similar to the investigation of inflationary models, we find very strong constraints ruling out ekpyrosis fro
... More

Presented by Dr. Kunihito UZAWA
on
2 Jul 2019
at
15:10

Type: oral presentation
Session:
Parallel: String Theory and Alternatives
Track: String Theory and Alternatives

Matrix Inflation, or M-flation in brevity, is a string theory motivated model of inflation that uses the matrix degrees of freedom of a stack of D3 branes in appropriate fluxes to realize inflation. In its minimal format, inflatons are minimally coupled to gravity. In order to match M-flation with observation, one needs a large number of D3-branes that can backreact on the background geometry. Pa
... More

Presented by Dr. Amjad ASHOORIOON
on
2 Jul 2019
at
14:30

Dynamic relaxation provides an interesting framework which intends to solve the hierarchy problem by postulating, that the observed value of the electroweak scale was determined dynamically in the early Universe. Values of the electroweak scale were scanned during an evolution of axion-like field (a relaxion), with a stopping mechanism responsible for fixing the scale at a small value.
The ori
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Presented by Mr. Adam MARKIEWICZ
on
4 Jul 2019
at
15:10

Type: oral presentation
Session:
Parallel: String Theory and Alternatives
Track: String Theory and Alternatives

While most particle physics models from string theory have been constructed in settings with some amount of supersymmetry, there has not been any experimental evidence, that it is actually realized in nature. We show that by starting from non-supersymmetric heterotic strings it is possible to construct models which have particle spectra surprisingly close to that of the Standard Model of particle
... More

Presented by Dr. Stefan GROOT NIBBELINK
on
1 Jul 2019
at
15:30

In arXiv:1904.12783, we showed through numerical simulations of a minimally coupled massive Klein-Gordon scalar field that it is possible to grow "hair" on a Schwarzschild black hole if one assumes a periodically time-varying (but spatially homogeneous) background. We saw a non-trivial profile emerge on a timescale related to the mass of the black hole, both with and without backreaction of the fi
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Presented by Dr. Katy CLOUGH
on
1 Jul 2019
at
18:00

The decay K+→π+vv , with a very precisely predicted branching ratio of less than 10exp[-10], is one of the best candidates to reveal indirect effects of new physics at the highest mass scales. The NA62 experiment at the CERN SPS is designed to measure the branching ratio of the K+→π+vv ̅ with a decay-in-flight technique. NA62 took data so far in 2016-2018. Statistics collected in 2016 allow
... More

Presented by Dr. Jacopo PINZINO
on
2 Jul 2019
at
17:20

The next generation detectors will verify, or at least constraint high energy phenomena, predicted by the vast variety of inflationary scenarios [1]. If a circularly polarized gravitational wave signal is detected, would point to the existence of parity breaking physics [2]. Here we consider, possible realizations of the effective field theory (EFT) of scalar-tensor gravity [3], which could offer
... More

Presented by Maria MYLOVA
on
2 Jul 2019
at
15:10

Solving non-perturbative, real-time dynamics of quantum field theory is big challenge. In this presentation we shall describe how Cauchy's theorem, and a sojourn into complex field-space, allows for the solution of the real-time path integral. This is achieved by showing that the Schwinger-Keldysh calculation may be split into two pieces, which ultimately guarantees a single saddle point in the Mo
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Presented by Dr. Paul SAFFIN
on
1 Jul 2019
at
14:30

The Wilsonian renormalization group (RG) requires Euclidean signature. The conformal factor of the metric then has a wrong-sign kinetic term, which has a profound effect on its RG properties. In particular around the Gaussian fixed point, it supports a Hilbert space of renormalizable interactions involving arbitrarily high powers of the gravitational fluctuations. These interactions are characteri
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Presented by Prof. Tim MORRIS
on
4 Jul 2019
at
14:30

I argue for the existence of topologically stable, finite mass monopoles within Born-Infeld extension of the standard model and discuss some phenomenological and cosmological implications.

Presented by Mr. Suntharan ARUNASALAM
on
1 Jul 2019
at
17:00

At low energies, the world around us can be described very accurately using the Standard Model and \Lambda CDM. However, these are at best only ``effective'' descriptions: valid at low energies but destined to break down as experiments in particle physics and cosmology probe increasingly higher energies, ultimately requiring a new (UV complete) theory to take over.
In this talk, I will review t
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Presented by Scott MELVILLE
on
1 Jul 2019
at
16:40

Primordial Black Holes (PBHs) are appealing candidates for dark matter in the universe but are severely constrained by theoretical and observational constraints. I will focus on the Hawking evaporation limits extended to Kerr Black Holes. These results have been obtained with a new code entitled BlackHawk that I will briefly present. In particular, I will review the isotropic extragalactic gamma r
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Presented by Dr. Alexandre ARBEY
on
4 Jul 2019
at
15:10

Primordial black holes have had a recent surge in popularity due to the LIGO/VIRGO detections and the possibility that they could make up all or part of the dark matter. However, even if you only want to produce one primordial black hole, there are tough requirements for the inflationary potential which can be translated into constraints on the primordial power spectrum. I will show that there is
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Presented by Philippa COLE
on
4 Jul 2019
at
14:50

We discuss lepton number violating processes in the context of long-baseline neutrino oscillations. We summarise and compare neutrino flavour oscillations in quantum mechanics and quantum field theory, both for standard oscillations and those that violate lepton number. When the active neutrinos are Majorana in nature, the required helicity-reversal gives a strong suppression by the neutrino mass
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Presented by Mr. Patrick BOLTON
on
1 Jul 2019
at
15:10

Since the early 1980s, Feynman and others discussed how quantum systems could be efficiently simulated through tools of quantum computation. Such quantum simulations may in fact turn out to be the only way certain phenomena experimentally difficult to realise can be studied, one such phenomena being neutrino oscillations.
Though neutrinos are predicted by the standard model to be massless and
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Presented by Mr. Farhan CHOWDHURY
on
2 Jul 2019
at
14:30

Session:
Parallel: Particle Physics Models of New Physics
Track: Particle Physics Models of New Physics

We consider the Maximally Symmetric Two-Higgs Doublet Model (MS-2HDM)
in which the so-called Standard Model (SM) alignment can be naturally
realised as a consequence of an accidental SO(5) symmetry in the Higgs
sector. This symmetry is broken (i) explicitly by
renormalization-group (RG) effects and (ii) softly by the bilinear
scalar mass term $m^2_{12}$. We find that in the MS-2HDM all quar
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Presented by Dr. Neda DARVISHI
on
1 Jul 2019
at
17:00

I summarise constraints on new forces in the dark sector, originating from interactions with a dark energy scalar field. For standard constant couplings, cosmological observations constrain any new forces between dark matter particles to be very small, which is a challenge for quintessence model building in string theory. Instead, I propose to consider coupling functions with possess a minimum at
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Presented by Prof. Carsten VAN DE BRUCK
on
2 Jul 2019
at
17:20

Inflation and dark energy share many essential properties. I will show that these two eras can be easily unified into a common framework based on scale invariance. I will present the associated cosmological history and discuss how the inclusion of non-minimally coupled spectator fields may lead to the spontaneous symmetry breaking of internal symmetries and its eventual restoration at the onset of
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Presented by Dr. Rubio JAVIER
on
1 Jul 2019
at
17:40

T2K is a long baseline neutrino experiment producing a beam of muon neutrinos at the Japan Particle Accelerator Research Centre on the East coast of Japan and measuring their oscillated state 295 km away at the Super Kamiokande detector. Since 2016 T2K has doubled its data in both neutrino and antineutrino beam modes. Coupled with improvements in analysis techniques this has enabled the experiment
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Presented by Dr. Laura Lee KORMOS
on
4 Jul 2019
at
14:30

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Presented by Dr. Nazila MAHMOUDI
on
4 Jul 2019
at
14:30

In the development of atomic clocks, some atomic transition frequencies are measured with remarkable precision. These measured spectra may include effects of a new force mediated by a weakly interacting boson. Such effects might be distilled out from possible violation of a linear relation in isotope shifts between two transitions, as known as King's linearity, with relatively suppressed theoretic
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Presented by Dr. Yasuhiro YAMAMOTO
on
1 Jul 2019
at
15:30

4-dimensional Starobinsky model, whose action has a curvature squared R^2 term, is one of the most promising inflation models. However the origin of the higher curvature term is still unknown. From the viewpoint of high energy physics, higher curvature terms should appear as a series of curvature, i.e. there must exist R^m (2<m) terms. In previous research, the authors added a R^m (2<m) term to 4-
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Presented by Mr. Yu ASAI
on
2 Jul 2019
at
15:50

Transition amplitudes describing dark-matter annihilation processes through a resonance may become highly inaccurate close to a production threshold if a Breit-Wigner propagator with a constant width is used. To partially overcome this problem, the BW propagator needs to be modified by including a momentum dependent decay width. However, such an approach to resonant transition amplitudes generical
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Presented by Mateusz DUCH
on
2 Jul 2019
at
15:10

The features of the NA62 experiment at the CERN SPS – high-intensity setup, trigger-system flexibility, high-frequency tracking of beam particles, redundant particle identification, and high-efficiency photon vetoes – make NA62 particularly suitable to search for long-lived, weakly-coupled particles within Beyond the Standard Model (BSM) physics, using kaon and pion decays as well as operating
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Presented by Dr. Monica PEPE
on
2 Jul 2019
at
17:40

Presence of nonholomorphic soft SUSY breaking terms is known to be a possibility in the popular setup of the Minimal Supersymmetric Standard Model (MSSM). It has been shown that such a scenario known as NonHolomorphic Supersymmetric Standard Model (NHSSM) could remain `natural' ( i.e., not fine-tuned) even in the presence of a rather heavy higgsino-like LSP. However, it turns out that distinguishi
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Presented by Prof. Utpal CHATTOPADHYAY
on
1 Jul 2019
at
17:20

Session:
Parallel: Particle Physics Models of New Physics
Track: Particle Physics Models of New Physics

The minimal standard model, viewed as an effective theory with spontaneously broken scale invariance, predicts light, feebly coupled dilaton. Although, the microscopic physics is almost indistinguishable from the standard model, the cosmological evolution is entirely different due to the presence of nearly flat direction in the Higgs-dilaton potential. Most notably, the electroweak phase transitio
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Presented by Prof. Archil KOBAKHIDZE
on
1 Jul 2019
at
14:30

As the lepton number and lepton flavor are conserved quantities in Standard Model, observation of charged lepton flavor violation (cLFV) process will provide clues on beyond-Standard model theories. COMET is an experiment at J-PARC, Japan, which will search for neutrinoless conversion of muons into electrons in the field of a nucleus (μ− + N → e− + N); a lepton flavor violating process. The
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Presented by Prof. Yoshi UCHIDA
on
4 Jul 2019
at
15:30

Presented by Prof. Un-ki YANG
on
3 Jul 2019
at
09:35

The origin of the neutrino mass is still an open problem in physics and many efforts are being made to solve it.
Among the possible solutions, the simplest ones involve an extension of the Standard Model, where new singlet fermions are added. Symmetry-protected variants of the seesaw mechanism, like the Inverse Seesaw, could explain the existence of light-neutrino masses while also providing obse
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Presented by Mr. Tommaso BOSCHI
on
2 Jul 2019
at
14:50

Presented is a proposed search for ultra light dark matter with the Atomic Interferometric Observatory and Network (AION)- a UK led initiative to design and build a multipurpose atom interferometer with the goal of probing the properties of dark matter and paving the way to detecting gravitational waves in the largely unexplored mid-band frequency range. The plan is to build a set of atom interfe
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Presented by Dr. Sarah MALIK
on
1 Jul 2019
at
16:40

Strong coupling in Higgs inflation at high energies hinders a joint description of inflation, reheating and low-energy dynamics. The situation may be improved with a proper UV completion of the model. A well-defined self-consistent way is to introduce an R^2-term into the action. In this modified model the strong coupling scale returns back to the Planck scale, which justifies the use of the pertu
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Presented by Mr. Chris SHEPHERD
on
1 Jul 2019
at
17:20

We review scenarios of baryogenesis through leptogenesis at early epochs of the universe, in string-inspired minimal extensions of the Standard Model (SM), involving heavy right-handed Majorana neutrinos. Spontaneous violation of CPT symmetry is induced by appropriate (in general, temperature-dependent) backgrounds of the Kalb-Ramond (KR) axion field, which has its origins in the (bosonic) massle
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Presented by Prof. Sarben SARKAR
on
4 Jul 2019
at
14:50

We construct type I string models where supersymmetry is spontaneously broken, which have exponentially small cosmological constant and are tachyon free at 1-loop. These theories have rigid Wilson lines associated with stacked branes. Models with positive effective potentials of runaway type are also presented.

Presented by Dr. Hervé PARTOUCHE
on
1 Jul 2019
at
14:50

The MEG experiment took data at the Paul Scherrer Institute in the years 2009-2013 and published the most stringent limit on the charged lepton flavor violating decay mu->egamma: BR(mu->egamma) <4.2 x 10^(-13) @90% C.L.
The MEG detector has been upgraded in order to reach a sensitivity of 5 x 10^(-14), which corresponds to an improvement of one order of magnitude.
The basic idea of MEG-II is to
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Presented by Dr. Cecilia VOENA
on
4 Jul 2019
at
15:10

The SHiP Collaboration has proposed a general-purpose experimental facility operating in beam dump mode at the CERN SPS accelerator with the aim of searching for light, long-lived exotic particles of Hidden Sector models. The SHiP experiment incorporates a muon shield based on magnetic sweeping and two complementary apparatuses. The detector immediately downstream of the muon shield is optimised b
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Presented by Dr. Oliver LANTWIN
on
2 Jul 2019
at
16:40

Recently the MiniBooNE Collaboration has reported an anomalous excess in muon to electron (anti-)neutrino oscillation data. Combined with long-standing results from the LSND experiment this amounts to a 6.1 sigma evidence for new physics beyond the Standard Model. In this talk I discuss a framework with 3 active and 3 sterile neutrinos with altered dispersion relations that can explain these anoma
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Presented by Prof. Heinrich PäS
on
2 Jul 2019
at
17:40

Presented by Prof. Ignatios ANTONIADIS
on
2 Jul 2019
at
09:35

The effective field theory of cosmic inflation has been highly constrained by the swampland conditions recently. In brane inflation the Friedmann equation is modified to include an additional parameter λ called brane tension that modifies the slow-roll parameters such that the restrictive swampland conditions can be naturally evaded. We discuss superconformal α-attractor E-models that are consis
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Presented by Mr. Mudassar SABIR
on
2 Jul 2019
at
15:30

I will introduce the innovative HI intensity mapping technique, which can turn the SKA and its MeerkAT precursor into precision cosmology machines. My talk will then focus on synergies between radio intensity mapping and optical galaxy surveys (e.g. GBT and SDSS, Euclid and SKA).

Presented by Dr. Alkistis POURTSIDOU
on
2 Jul 2019
at
16:40

I am going to compare two simple models of dark matter (DM): a vector
and a scalar DM model. Both models require the presence of two physical Higgs bosons h_1 and h_2 which come from mixed components of the standard Higgs doublet H and a complex singlet S. In the vector model, the extra U(1) symmetry is spontaneously broken by the vacuum of the complex field S. This leads to a massive gauge boson
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Presented by Prof. Bohdan GRZADKOWSKI
on
2 Jul 2019
at
18:00

MicroBooNE, the Micro Booster Neutrino Experiment at Fermilab, is an 85-ton active mass liquid argon time projection chamber (LArTPC) located in the Booster Neutrino Beam at Fermilab. MicroBooNE is the first of three LArTPC detectors that form the Short-Baseline Neutrino (SBN) program at Fermilab, which has three main aims: to search for new physics, particularly eV-scale sterile neutrinos, to stu
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Presented by Dr. Stephen DENNIS
on
2 Jul 2019
at
16:40

Super-Kamiokande (SK) is a large-scale water Cherenkov neutrino detector located 1km underground in Gifu prefecture, Japan. Credited, alongside the SNO experiment, for the discovery of neutrino oscillation, SK has a rich history of neutrino physics. Refurbishment work was recently completed to prepare SK for its next phase: SK-Gd. This upgrade consists of doping SK with gadolinium, which allows fo
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Presented by Mr. Alexander GOLDSACK
on
2 Jul 2019
at
15:30

Geometry has long been an important tool in physics, finding it's place in everything from Einstein's theory of General Relativity to the structure of Lie groups in Quantum Field Theory. In this talk I will extend the reach of geometry even further by presenting the Eisenhart lift. This formalism allows the classical dynamics of any scalar field theory to be re-expressed as a consequence of the ge
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Presented by Mr. Kieran FINN
on
1 Jul 2019
at
15:10

The Inert Doublet Model is an intriguing extension of the SM scalar sector. It is a two Higgs doublet model with a discrete Z_2 symmetry, that renders the lightest particle from the second doublet stable and therefore provides a good dark matter candidate. Current constraints on the model as well as discovery prospects at current and future searches will be discussed, with a special emphasis on fu
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Presented by Jan KALINOWSKI
on
1 Jul 2019
at
16:40

LUX-ZEPLIN (LZ) is a xenon-based direct detection dark matter experiment, currently under construction about one mile below ground at the Sanford Underground Research Facility in the USA. The experiment's 5.6 tonnes of fiducial volume will be a 22-fold increase over its predecessor, LUX. This will allow the experiment to be sensitive to 40 GeV WIMPs with spin-independent cross-sections as low as
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Presented by Mr. Benjamin KRIKLER
on
1 Jul 2019
at
16:40

We consider a scalar field with a bottom-less linear potential, finding that cosmologies unavoidably end up with a crunch, even in scenarios compatible with the observed positive cosmological constant. Assuming that rebounces avoid singularities, this generates a new kind of multiverse: the universe undergoes cycles with different cosmological constants, all with finite lifetime regardless of the
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Presented by Mr. Daniele TERESI
on
2 Jul 2019
at
17:00

The Pierre Auger Observatory is the largest detector for cosmic rays
with energies above EeV. The Observatory has established a clear
suppression of the fluxes of the highest energy particles, charged nuclei, which are expected to come from extragalactic sources. The contribution of photons and neutrinos from more exotic sources is strongly limited. Cosmic rays are detected through the extensiv
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Presented by Sofia ANDRINGA
on
2 Jul 2019
at
17:10

The possibility of a light stop mass less then 800 GeV is conflicted with the stability of electroweak vacuum in the context of restricted models such as CMMC. In this work, we consider the most general class possible of soft super symmetry breaking terms that can be added to the MSSM. We discuss the impact of non-standard soft breaking terms on the light stop sector. We show these terms lead to l
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Presented by Dr. Ahmad FARZANEH KORD
on
1 Jul 2019
at
17:40

In the standard picture of cosmology, the Universe began at the Big Bang; the Big Bang itself is a singularity where the laws of physics break down. A quantum theory of gravity should resolve this singularity and help in understanding the initial state of the Universe needed to account for present observations. I will present some progress towards this goal in the group field theory approach to qu
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Presented by Dr. Steffen GIELEN
on
2 Jul 2019
at
14:30

TBA

Presented by Dr. Florian KUHNEL
on
4 Jul 2019
at
14:30

We consider string theory compactifications where the effective four-dimensional space-time, the internal space and the background fluxes are all time-dependent. For these cases we analyse the existence of four-dimensional effective field theories.

Presented by Dr. Tatar RADU
on
4 Jul 2019
at
15:10

Some physics scenarios beyond the Standard Model of particle physics restore right-handed weak currents, which would manifest themselves in the polarization of the photon produced in $b\to s\gamma$ transitions. Due to the $V-A$ structure of the quark-$W$ coupling in the Standard Model, this polarization is strongly correlated with the flavour of the b-quark and suppresses interference responsible
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Presented by Dr. Olga VERBITSKAJA
on
2 Jul 2019
at
17:00

We study the consequences of (beyond) positivity of scattering amplitudes in the effective field theory description of the Higgs-Dilaton inflationary model. By requiring the EFT to be compatible with a unitary, causal, local and Lorentz invariant UV completion, we derive constraints on the Wilson coefficients of the first higher order derivative operators. We show that the values allowed by the co
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Presented by Dr. Inar TIMIRYASOV
on
1 Jul 2019
at
17:40

Flavor symmetry plays a crucial role in the standard model of particle physics but its origin is still unknown. A new method is presented to determine flavor symmetries within compactified string theory. This method is based on the outer automorphisms of the Narain space group of an orbifold. The resulting flavor symmetries are hence closely related to modular symmetries (i.e. T-duality). By apply
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Presented by Mr. Alexander BAUR
on
1 Jul 2019
at
15:10

The XENON collaboration has an experimental program consisting of a series of liquid-xenon time-projection chambers to directly detect our galactic dark matter halo. The most recent detector XENON1T is currently the most sensitive direct detection experiment to date at the electroweak scale, while still being sensitive to new physics processes such as the double-electron capture process that we r
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Presented by Prof. Christopher TUNNELL
on
1 Jul 2019
at
17:40

We study a class of models in which the Standard Model (SM) is augmented by vector-like leptons:one doublet and a singlet, which are odd under an unbroken discrete Z_2 symmetry. As a result, the neutral component of these additional vector-like leptons are stable and behave as dark matter. We study the phenomenological constraints on the model parameters and elucidate the parameter space for rel
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Presented by Dr. Narendra SAHU
on
4 Jul 2019
at
14:50

In the Standard Model, electroweak symmetry breaking is a crossover. In many extensions, the phase transition can be of first order – even strongly so. The resulting phase transition can then be a substantial source of gravitational waves. For a phase transition at or around the electroweak scale, these gravitational waves may be detectable by future or planned missions, such as LISA. This can i
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Presented by David WEIR
on
2 Jul 2019
at
15:30

We investigate the potential of the Large Hadron Collider (LHC) to probe one of the most compelling Beyond the Standard Model (BSM) frameworks --- Walking Technicolor (WTC), involving strong dynamics and having a slowly running (walking) new strong coupling. For this purpose we use recent LHC Run2 data to explore the full parameter space of the minimal WTC model using dilepton signatures from heav
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Presented by Ms. Azaria COUPE
on
2 Jul 2019
at
14:30

Type: oral presentation
Session:
Parallel: Cosmological Probes
Track: Neutrinos and Non-Accelerator Probes of New Physics

We present a first overview of aSuperIso_DM, a platform based on Mathematica and C++ that is dedicated to the computation of various dark matter observables in the framework of a quantum field theory that can be cast under a Lagrangian form and that features a dark matter particle. aSuperIso_DM generalizes the supersymmetry-specific program SuperIso Relic by relying on an interface to FeynRules to
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Presented by Dr. Glenn ROBBINS
on
4 Jul 2019
at
15:30

In $\mu$-hybrid inflation a nonzero inflaton vacuum expectation value induced by supersymmetry breaking is proportional to the gravitino mass $m_{3/2}$, which can be exploited to resolve the minimal supersymmetric standard model $\mu$ problem. We show how this scenario can be successfully implemented with $m_{3/2} \sim 1-100$~TeV and reheat temperature as low as $10^6$~GeV by employing a minimal r
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Presented by Ms. Fariha VARDAG
on
4 Jul 2019
at
14:30