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Title

Neutrinoless Double-β Decay with Nonstandard Majoron Emission

AuthorsCepedello, R.; Deppisch, Frank F.; González, L.; Hati, C.; Hirsch, Martin
Issue DateMay-2019
PublisherAmerican Physical Society
CitationPhysical Review Letters 122 (18): 181801 (2019)
AbstractWe present a novel mode of neutrinoless double-β decay with emission of a light Majoron-like scalar particle φ. We assume it couples via an effective seven-dimensional operator with a (V+A) lepton current and (V±A) quark currents leading to a long-range contribution that is unsuppressed by the light neutrino mass. We calculate the total double-β decay rate and determine the fully differential shape for this mode. We find that future double-β decay searches are sensitive to scales of the order ΛNP≈1 TeV for the effective operator and a light scalar mφ<0.2 MeV, based on ordinary double-β decay Majoron searches. The angular and energy distributions can deviate considerably from that of two-neutrino double-β decay, which is the main background. We point out possible ultraviolet completions where such an effective operator can emerge.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.122.181801
URIhttp://hdl.handle.net/10261/204903
DOIhttp://dx.doi.org/10.1103/PhysRevLett.122.181801
Identifiersdoi: 10.1103/PhysRevLett.122.181801
issn: 1079-7114
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