1-5 July 2019
The University of Manchester
Europe/London timezone
- pascos2019@manchester.ac.uk
- +44 (0)161 275 4171
The Local Organising Committee
Quartic Coupling Unification
Presented by Dr. Neda DARVISHI
on
1 Jul 2019
from
17:00
to
17:20
Track: Particle Physics Models of New Physics
Content
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 quartic
couplings can unify at large RG scales
$\mu_X \sim 10^{11}$-$10^{20}$ GeV. In particular, we show that
quartic coupling unification can take place in two different
conformally invariant points, where all quartic couplings vanish. We
perform a vacuum stability analysis of the model in order to ensure
that the electro-weak vacuum is sufficiently long-lived. The MS-2HDM
is a minimal and very predictive extension of the SM governed by only
three additional parameters: the unification scale $\mu_X$,
the charged Higgs mass $M_{h^{\pm}}$ (or $m^2_{12}$) and $\tan\beta$,
which allow one to determine the entire Higgs sector of the model.
In terms of these input parameters, we present illustrative
predictions of misalignment for the SM-like Higgs-boson couplings
to the $W^\pm$ and $Z$ bosons and, for the first time, to the top and bottom quarks.
Place
Location: Schuster
Room: Bragg Lecture Theatre