Topical seminar: ¨Beyond the Standard Model physics searches with double-beta decays and the GERDA experiment ¨

por Elisabetta Bossio

miércoles 26 abr. 2023 12:00 → 13:00 Europe/Madrid

1001-Primera-135 - Nave Exp. Sala de Audiovisuales (Universe)

Observing neutrino-less double-beta (0νββ) decay would imply that neutrinos have a Majorana mass component and provide evidence of lepton number violation. While hunting for this rare decay, experiments collect huge statistics of two-neutrino double-beta (2νββ) decay events. These decays, allowed in the Standard Model, are amongst the rarest nuclear processes ever observed and a powerful source of physics beyond the Standard model. Violation of Lorentz symmetry or the existence of new particles, like Majorons or sterile neutrinos, would affect the shape of the measured two-electron spectrum, originating detectable and characteristic signatures. 
Precision studies of the electron sum energies require ultra-low background and an excellent understanding of the experiment’s response. Both are key features of the Germanium Detector Array (GERDA) experiment, which deployed enriched high-purity germanium detectors in Liquid Argon at Laboratori Nazionali del Gran Sasso (LNGS) in Italy. This talk will cover the final result of GERDA on the search for 0νββ decay, on the search for distortion of the 2νββ decay spectrum, which allows probing beyond the Standard Model physics, and the latest result on the precision measurement of the 76Ge 2νββ decay half-life.