TY  - JOUR
AU  - Cepedello, R.
AU  - Deppisch, F. F.
AU  - Gonzalez, L.
AU  - Hati, C.
AU  - Hirsch, M.
PY  - 2019
DA  - 2019//
TI  - Neutrinoless Double-Beta Decay with Nonstandard Majoron Emission
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 181801
EP  - 6pp
VL  - 122
IS  - 18
PB  - Amer Physical Soc
AB  - 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.
SN  - 0031-9007
UR  - https://arxiv.org/abs/1811.00031
UR  - https://doi.org/10.1103/PhysRevLett.122.181801
DO  - 10.1103/PhysRevLett.122.181801
LA  - English
N1  - WOS:000467042800001
ID  - Cepedello_etal2019
ER  -