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SUMMARY:Search for processes beyond the Standard Model in the GERDA experi
 ment
DTSTART;VALUE=DATE-TIME:20241025T133000Z
DTEND;VALUE=DATE-TIME:20241025T134500Z
DTSTAMP;VALUE=DATE-TIME:20260305T211919Z
UID:indico-contribution-4277@cern.ch
DESCRIPTION:Speakers: Anatoly Smolnikov (JINR)\nThe main goal of the GERDA
  experiment was to search for the neutrinoless double-beta decay of $^{76}
 $Ge. Beside this\, many other GERDA results of searching for various proce
 sses beyond the Standard Model were obtained. Among them\, a possible mani
 festation of the inclusive\, mode independent decays of a single neutron a
 nd proton and some specific modes of tri-nucleon decays in $^{76}$Ge were 
 investigated\, as well as a possible decay of an electron via channel e$^-
 $→ ν$_e$ γ. A search for full energy depositions from bosonic keV-scal
 e dark matter candidates has been performed too. After 127.2 kg yr of tota
 l exposure\, a limit on the half-life of neutrinoless double-beta decay in
  $^{76}$Ge is set at $T_{1/2}$ > $1.8\\times 10^{26}$ yr \, which correspo
 nds to an upper limit on the effective Majorana neutrino mass *m*$_β$$_β
 $  $1.5\\times 10^{24}$ yr  and for protons τ$_p$ > $1.3\\times 10^{24}$ 
 yr at 90% C.I. This is the first limit obtained for $^{76}$Ge. The obtaine
 d limit on the sum of the decay widths of the four inclusive tri-nucleon d
 ecays corresponds to a lower lifetime limit of $1.2\\times 10^{26}$ yr. Th
 is result improves previous limits for tri-nucleon decays by one to three 
 orders of magnitude. For the electron decay e$^-$→ ν$_e$ γ a lower lim
 it of τ$_e$ > $5.4\\times 10^{25}$ yr has been determined. The limits for
  the search of bosonic dark matter candidates pose the most stringent dire
 ct experimental results between 140 and 1021 keV. The brief description of
  the other results for several non-standard mechanisms of double-beta deca
 y is also included.\n\nhttps://indico.particle.mephi.ru/event/436/contribu
 tions/4277/
LOCATION: Petrovskiy 1
URL:https://indico.particle.mephi.ru/event/436/contributions/4277/
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