Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-07-21
Phys.Rev. D49 (1994) 5925-5944
Physics
High Energy Physics
High Energy Physics - Phenomenology
43 pages, 10 figures (included), [figure captions are now included]
Scientific paper
10.1103/PhysRevD.49.5925
Motivated by the excess events that have recently been found near the endpoints of the double beta decay spectra of several elements, we re-examine models in which double beta decay can proceed through the neutrinoless emission of massless Nambu-Goldstone bosons (majorons). Noting that models proposed to date for this process must fine-tune either a scalar mass or a VEV to be less than 10 keV, we introduce a new kind of majoron which avoids this difficulty by carrying lepton number $L=-2$. We analyze in detail the requirements that models of both the conventional and our new type must satisfy if they are to account for the observed excess events. We find: (1) the electron sum-energy spectrum can be used to distinguish the two classes of models from one another; (2) the decay rate for the new models depends on different nuclear matrix elements than for ordinary majorons; and (3) all models require a (pseudo) Dirac neutrino, having a mass of a several hundred MeV, which mixes with $\nu_e$.
Burgess Cliff P.
Cline James M.
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