Majorons Without Majorana Masses and Neutrinoless Double Beta Decay

C.P. Burgess; J.M. Cline

Majorons Without Majorana Masses and Neutrinoless Double Beta Decay

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arxiv hep-ph/9209299 v1 pith:STT64UGN submitted 1992-09-30 hep-ph

C.P. Burgess , J.M. Cline This is my paper · ORCID

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keywords betadecaydoubleemissionmajoronsneutrinolessdifferentelements

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abstract

We explain excess events near the endpoints of the double beta decay spectra of several elements, using the neutrinoless emission of massless Goldstone bosons. Models with scalars carrying lepton number $-2$ are proposed for this purpose so that ordinary neutrinoless double beta decay 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 double beta decay. The electron spectrum has a different shape, and the rate depends on different nuclear matrix elements, than for the emission of ordinary Majorons.

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$2\nu\beta\beta$ Spectrum in Chiral Effective Field Theory
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Chiral EFT corrections to the 2νββ electron spectrum from weak magnetism and pion exchange appear at next-to-leading order and must be included in searches for new physics.

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