TY  - JOUR
AU  - Helo, J. C.
AU  - Hirsch, M.
AU  - Ota, T.
PY  - 2016
DA  - 2016//
TI  - Long-range contributions to double beta decay revisited
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 006
EP  - 32pp
VL  - 06
IS  - 6
PB  - Springer
KW  - Beyond Standard Model
KW  - Neutrino Physics
AB  - We discuss the systematic decomposition of all dimension-7 (d = 7) lepton number violating operators. These d = 7 operators produce momentum enhanced contributions to the long-range part of the 0 nu beta beta decay amplitude and thus are severely constrained by existing half-live limits. In our list of possible models one can find contributions to the long-range amplitude discussed previously in the literature, such as the left-right symmetric model or scalar leptoquarks, as well as some new models not considered before. The d = 7 operators generate Majorana neutrino mass terms either at tree-level, 1-loop or 2-loop level. We systematically compare constraints derived from the mass mechanism to those derived from the long-range 0 nu beta beta decay amplitude and classify our list of models accordingly. We also study one particular example decomposition, which produces neutrino masses at 2-loop level, can fit oscillation data and yields a large contribution to the long-range 0 nu beta beta decay amplitude, in some detail.
SN  - 1029-8479
UR  - http://arxiv.org/abs/1602.03362
UR  - https://doi.org/10.1007/JHEP06(2016)006
DO  - 10.1007/JHEP06(2016)006
LA  - English
N1  - WOS:000377413400001
ID  - Helo_etal2016
ER  -