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Title: Conditions for detecting CP violation via neutrinoless double beta decay

Abstract

Neutrinoless double beta decay data, together with information on the absolute neutrino masses obtained from the future KATRIN experiment and/or astrophysical measurements, provide a chance to find CP violation in the lepton sector with Majorana neutrinos. We derive and discuss necessary conditions which make discovery of such CP violation possible for the future neutrino oscillation and mass measurements data.

Authors:
;  [1]
  1. Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice (Poland)
Publication Date:
OSTI Identifier:
20776634
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 73; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevD.73.033001; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CP INVARIANCE; DOUBLE BETA DECAY; NEUTRINO OSCILLATION; NEUTRINOS; REST MASS; STANDARD MODEL

Citation Formats

Joniec, A., and Zralek, M. Conditions for detecting CP violation via neutrinoless double beta decay. United States: N. p., 2006. Web. doi:10.1103/PhysRevD.73.033001.
Joniec, A., & Zralek, M. Conditions for detecting CP violation via neutrinoless double beta decay. United States. doi:10.1103/PhysRevD.73.033001.
Joniec, A., and Zralek, M. Wed . "Conditions for detecting CP violation via neutrinoless double beta decay". United States. doi:10.1103/PhysRevD.73.033001.
@article{osti_20776634,
title = {Conditions for detecting CP violation via neutrinoless double beta decay},
author = {Joniec, A. and Zralek, M.},
abstractNote = {Neutrinoless double beta decay data, together with information on the absolute neutrino masses obtained from the future KATRIN experiment and/or astrophysical measurements, provide a chance to find CP violation in the lepton sector with Majorana neutrinos. We derive and discuss necessary conditions which make discovery of such CP violation possible for the future neutrino oscillation and mass measurements data.},
doi = {10.1103/PhysRevD.73.033001},
journal = {Physical Review. D, Particles Fields},
number = 3,
volume = 73,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2006},
month = {Wed Feb 01 00:00:00 EST 2006}
}
  • CP-violation effects in neutrinoless double-beta decays are discussed in the case of two-generation Majorana neutrinos. It is shown that the recent experimental results of /sup 3/H beta decay and neutrinoless double-beta decay, when taken at their face values, imply that the CP-violating phase angle in the mixing matrix for the left-handed lepton sector must be less than 16/sup 0/.
  • We study the relation between the Majorana neutrino mass matrices and the neutrinoless double {beta} decay when {ital CP} is not conserved. We give an explicit form of the decay rate in terms of a rephasing-invariant quantity and demonstrate that in the presence of {ital CP} violation there must be neutrinoless double {beta} decay in the case of two neutrino generations (or when the third generation leptons do not mix with other leptons and hence decouple).
  • We investigate the {ital e}{sup {minus}}{ital e}{sup {minus}}{r_arrow}{ital W}{sub {ital i}}{sup {minus}}{ital W}{sub {ital j}}{sup {minus}} reactions for the various gauge boson production processes in the frame of the standard model with additional right-handed neutrinos and in the left-right symmetric model. The present bounds on the various model parameters are taken into account. The question of the cross section behavior for large energy and the {ital CP} violation problems are discussed.
  • CP violation plays a crucial role in the generation of the baryon asymmetry in the Universe. Within this context we investigate the possibility of CP violation in the lepton sector caused by Majorana neutrino mixing. Focus is put on the model including 1 sterile neutrino. Both cases of normal and inverted neutrino mass spectrum are considered. We address the question whether the Majorana phases can be measured in the neutrinoless double-beta decay experiments with sensitivity to the effective Majorana neutrino mass of the order of 10{sup −2} eV.
  • We reexamine the feasibility of an experiment proposed by Skalsey to observe neutrinoless double-beta processes between pairs of single-beta emitters.