Manchester Particle Physics Seminars, Colloquia and Meetings

Diego Ramírez: Observation of Excess Electronic Recoil Events in XENON1T

Friday, 10 July 2020 from to (Europe/London)
at Zoom
XENON1T, a direct dark matter detector operated at the Laboratori Nazionali del Gran Sasso, set the most stringent cross-section limits for weakly interacting massive particles (WIMPs) down to 3 GeV/c2 masses. While its primary detection channel targets WIMP nuclear recoils off the Xe nuclei, an unprecedented low background of 76 ± 2 events/(tonne × year × keV) between 1–30 keV allows to explore new parameter space for electronic recoil interactions.

This talk presents the latest results from a search for solar axions, an enhanced neutrino magnetic moment using solar neutrinos, and bosonic dark matter. Our search revealed an excess of events in the (1, 7) keV region, favoring these channels over background with significances of 3.5 sigma for solar axions and 3.2 sigma for a neutrino magnetic moment signal. We review the detection principles, cross checks of our results, discrepancy with stellar constraints, and present a hypothesis of a new background from a previously undetected tritium component.

Please note, the seminar will be held via Zoom Connections will begin at 12:30 with the seminar beginning at 13:00.