Abstract
We analyze the sensitivity of low-energy fundamental symmetry tests to interactions mediated by doubly-charged scalars that arise in type II seesaw models of neutrino mass and their left-right symmetric extensions. We focus on the next generation measurement of the parity-violating asymmetry in M\o{}ller scattering planned by the MOLLER collaboration at Jefferson Laboratory. We compare the MOLLER sensitivity to that of searches for charged lepton flavor violation (CLFV) and neutrinoless double beta-decay ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$-decay) as well as present and possible future high-energy collider probes. We show that for the simplest type-II seesaw scenario, CLFV searches have the greatest sensitivity. However, in a left-right symmetric extension where the scale of parity-breaking is decoupled from the $SU(2{)}_{R}$-breaking scale, the MOLLER experiment will provide a unique probe of scalar triplet interactions in the right-handed sector for a doubly-charged scalar mass up to $\ensuremath{\sim}10\text{ }\text{ }\mathrm{TeV}$ and help elucidate the mechanism of $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$-decay.
Highlights
Explaining the origin of the nonvanishing but tiny neutrino masses is a key open problem for particle physics
The corresponding Yukawa couplings can be of order Oð1Þ, while the suppressed neutrino mass scale arises from the ratio of the weak and seesaw scales
We focus in particular on the interplay of searches for charged lepton flavor violation (CLFV) and the neutrinoless double beta-decay (0νββdecay) of heavy nuclei with a generation measurement of the parity-violating asymmetry in fixed-target, polarized Møller scattering
Summary
Explaining the origin of the nonvanishing but tiny neutrino masses is a key open problem for particle physics. Larger Yukawa couplings could be made compatible with the neutrino oscillation data in a natural way in the inverse [13,14,17] and linear [15,16,18] seesaw models with small lepton number breaking Another possibility is by making the vacuum expectation value (vev) responsible for neutrino mass generation much smaller than the electroweak scale, as in the case of type II seesaw [6,7,8,9,10,11].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
