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http://dx.doi.org/10.1103/physrevd.37.1131 | DOI Listing |
Phys Rev Lett
May 2019
AHEP Group, Instituto de Física Corpuscular-CSIC/Universitat de València Edificio de Institutos de Paterna, Apartado 22085, E-46071 València, Spain.
We 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.
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