Neutrinoless Double Beta Decay from a Modern Perspective

Details Neutrinoless Double Beta Decay from a Modern Perspective Neutrinoless Double Beta Decay from a Modern Perspective

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.o7010v&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Neutrinoless double beta decay is important both from the particle and nuclear physics point of view. From the elementary particle point of view it pops up everywhere , giving rise to the following: The light and heavy neutrino average mass, the right handed λ and η couplings, the SUSY R-parity breaking lepton violating parameter as well as that arising from physics in extra dimensions (branes) etc. Regardless of the dominant mechanism its observation will signal that the neutrinos are massive Majorana particles. From the nuclear physics point of view it is challenging because: 1) The relevant nuclei have complicated nuclear structure. 2) The energetically allowed transitions are suppressed . 3) The intermediate particles in some mechanisms are so heavy that the short distance behavior must be tackled. 4) The momentum dependent terms of the nucleon current cannot be ignored. Taking such effects into account the nuclear matrix elements for A = 76, 82, 96, 100, 116, 128, 130, 136 and 150 have become reliable. From the presently available experimental limits on the half-lives, new limits on the relevant lepton violating parameters have been extracted imposing stringent constraints on the fashionable particle models.

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