Elsevier

Physics Letters B

Volume 298, Issues 1–2, 7 January 1993, Pages 141-148
Physics Letters B

Majorons without majorana masses and neutrinoless double beta decay

https://doi.org/10.1016/0370-2693(93)91720-8Get rights and content

Abstract

We explain excess events near the endpoints of the double beta decay (ββ) spectra of several elements, using the neutrinoless emission of massless Goldstone bosons. Models with scalar carrying lepton number −2 are proposed for this purpose so that ordinary neutrinoless ββ is forbidden, and we can raise the scale of global symmetry breaking above the 10 keV scale needed for observable emission of conventional majorons in ββ. The electron spectrum has different shape, and the rate depends on different nuclear matrix elements, than for the emission of ordinary majorons.

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    Present address: Theoretical Physics Institute, University of Minnesota, Minneapolis, MN 55455, USA.

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