Neutrinoless ββ decay and a new limit on the right-handed current

Neutrinoless double-beta decay, is a beyond the Standard Model process that would indicate that neutrinos are Majorana fermions and the lepton number is not conserved. It could be interesting to use the neutrinoless double-beta decay observations to distinguish between several beyond Standard Model mechanisms that could contribute to this process. Accurate nuclear structure calculations of the nuclear matrix elements necessary to analyze the decay rates could be helpful to narrow down the list of contributing mechanisms. We investigate the information one can get from the angular and energy distribution of the emitted electrons, and from the half-lives of several isotopes, assuming that the right-handed currents exist. For the analysis of these distributions we calculate the necessary nuclear matrix elements using shell model techniques, and we explicitly consider interference terms.

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“…Refs. [40][41][42][43][44] among other). Our analysis is however more detailed and more specific to the decay of the 82 Se isotope.…”

Section: Introductionmentioning

confidence: 99%

Analysis of mechanisms that could contribute to neutrinoless double-beta decay

Horoi

Neacsu

2016

Phys. Rev. D

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“…Such analyses would compare results for 0νββ with other experimental searches, but there are also ways to gain more information within the realm of 0νββ decay and related nuclear processes. Possible techniques include the analysis of angular and energy correlations between the electrons emitted in the 0νββ decay [5,[28][29][30][31][32] or a comparison of results for 0νββ decay in two or more isotopes [33][34][35][36]. These two approaches are studied in this paper.…”

Section: Introductionmentioning

confidence: 99%

Probing new physics models of neutrinoless double beta decay with SuperNEMO

Arnold

Augier

Baker³

et al. 2010

Eur. Phys. J. C

204

166

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The possibility to probe new physics scenarios of light Majorana neutrino exchange and right-handed currents at the planned next generation neutrinoless double β decay experiment SuperNEMO is discussed. Its ability to study different isotopes and track the outgoing electrons provides the means to discriminate different underlying mechanisms for the neutrinoless double β decay by measuring the decay half-life and the electron angular and energy distributions.a

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“…This is so because the relevant contributions come from the standard left-left coupling. With regard to the hadronic currents, all the terms up to order v/c are included because, as first noticed by Tomoda et al [19], they contribute significantly to the zero neutrino mode.…”

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confidence: 99%