Aperitivo Scientifico: Observation of Excess Electronic-Recoil Events in XENON1T

by Pietro Di Gangi (BO)

Zoom (Virtual)




We report results from searches for new physics with low-energy electronic recoil data recorded with the XENON1T detector. With an exposure of 1042 kg x  227 days and an unprecedented low background rate of 76 \pm  2 (stat) events/(tonne  year  keV) between 1-30 keV, the data enables the most sensitive searches for new physics such as solar axions, an enhanced neutrino magnetic moment using solar neutrinos, and bosonic dark matter. 
An excess over known backgrounds is observed below 7 keV. We report on its interpretation in terms of the mentioned physics signals, as well as of a not previously considered background source from tritium.