Zoom meeting: https://cern.zoom.us/j/7930190483 (password: see email)
Speaker: Michelle Galloway on behalf of the XENON1T Collaboration
Abstract: We present the latest results from a search for QCD axions from the Sun as well as axion-like particles of solar and dark matter origins. With an unprecedented low background of 76 ± 2 stat events/(tonne × year × keV) between 1–30 keV, XENON1T is uniquely poised to explore new parameter space for these electronic-recoil channels via the axio-electric effect. 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/ALPs and 3.0 sigma global (4.0 local) for ALP dark matter with a peak at 2.3 +- 0.2 keV (68% C.L.). 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.