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SUMMARY:Tests of the Lorentz invariance violation in double-beta decay
DTSTART;VALUE=DATE-TIME:20210831T162500Z
DTEND;VALUE=DATE-TIME:20210831T164000Z
DTSTAMP;VALUE=DATE-TIME:20260819T230932Z
UID:indico-contribution-15636@indico.ific.uv.es
DESCRIPTION:Speakers: Sabin Stoica (International Centre for Advanced Trai
 ning and Research in Physics (CIFRA))\nThere is currently interest in test
 ing possible Lorentz invariance violation (LIV) in different physical proc
 esses.  LIV effects have also been searched in the neutrino sector\, mainl
 y in neutrino oscillation experiments. However\, there are LIV effects ind
 uced by a Lorentz-violating operator in the Standard Model extension (SME)
  theory\, called countershaded operator\, which does not affect the neutri
 no oscillations. Such effects\, related to the time-like component of this
  operator\, which are controlled by the oscillation-free (of) coefficient 
 (aof3)00\, would produce small deviations in the\nshape of the energy spec
 tra of electrons emitted in double-beta decays. Such investigations are cu
 rrently been conducted in several double beta decay experiments as EXO\, G
 ERDA\, SuperNEMO\, CUORE and CUPID-0. These analysis are based on accurate
  theoretical predictions of the electron spectra and their angular correla
 tions in 2νββ decay.  \nIn my talk I will give a current review of this
  topic. I will first present the precise calculation of the summed energy 
 electron spectra and their deviations due to LIV\, and the constraints of 
 the (aof3)00 coefficient obtained from these analyzes. Next\, I show that 
 current investigations of LIV can be complemented by searches in the singl
 e electron spectra and angular correlations between the emitted electrons.
  Distortions due to LIV occur in the single electron spectra (maximal at s
 mall electron energies) and other effects may be highlighted by analyzing 
 the angular correlation spectra and the ratio between the SME electron spe
 ctra and their SM forms. Finally\, I will present an\nalternative\, new me
 thod to constrain (aof3)00 through the measurement of the angular correlat
 ion coefficient\, and show that future experiments can improve these limit
 s significantly.\n\nReferences\n1. S. Stoica\, Investigation of Lorentz sy
 mmetry violation in double-beta decay\, MEDEX’19\, Prague\, May 28-June 
 2\, 2019 (invited lecture).\n2. O. Nitescu\, S. Ghinescu\, and S. Stoica\,
  J. Phys. G 47\, 055112 (2020).\n3. O. Nitescu\, S. Ghinescu\, and S. Stoi
 ca\, Phys. Rev. D  103\, L031701 (2021).\n4. S. Stoica\, Study of kinemati
 c factors in double-beta decay\, Conference on Neutrino and Nuclear Physic
 s (CNNP2020)\, February 20-24\, Cape Town\, South Africa (invited lecture)
 .\n\nhttps://indico.ific.uv.es/event/6178/contributions/15636/
LOCATION:
URL:https://indico.ific.uv.es/event/6178/contributions/15636/
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