%0 Journal Article %T Neutrinoless Double-Beta Decay with Nonstandard Majoron Emission %A Cepedello, R. %A Deppisch, F. F. %A Gonzalez, L. %A Hati, C. %A Hirsch, M. %J Physical Review Letters %D 2019 %V 122 %N 18 %I Amer Physical Soc %@ 0031-9007 %G English %F Cepedello_etal2019 %O WOS:000467042800001 %O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4002), last updated on Mon, 12 Aug 2019 16:25:58 +0000 %X We present a novel mode of neutrinoless double-beta decay with emission of a light Majoron-like scalar particle phi. 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-beta decay rate and determine the fully differential shape for this mode. We find that future double-beta decay searches are sensitive to scales of the order Lambda(NP) approximate to 1 TeV for the effective operator and a light scalar m(phi) < 0.2 MeV, based on ordinary double-beta decay Majoron searches. The angular and energy distributions can deviate considerably from that of two-neutrino double-beta decay, which is the main background. We point out possible ultraviolet completions where such an effective operator can emerge. %R 10.1103/PhysRevLett.122.181801 %U https://arxiv.org/abs/1811.00031 %U https://doi.org/10.1103/PhysRevLett.122.181801 %P 181801-6pp