1212.0612 (Sudhanwa Patra)

$0 νββ$ decay process in left-right symmetric models without
scalar Bidoublet    [PDF]

Sudhanwa Patra

We present an alternative formulation of the left-right symmetric theory where the scalar sector consists of two Higgs doublets which differs from the standard version of the left-right model that makes use of $L-$ and $R-$ Higgs triplets and a Higgs bi-doublet. The basic idea is to consider few extra charged iso-singlet fields and the fermion masses can be realized by integrating out these heavy isosinglet fields. We also give a detailed discussion on neutrinoless double beta decay in this particular left-right symmetric theory where the right-handed Majorana neutrino can be of MeV range. With this RH Majorana mass around MeV scale, the contribution to neutrinoless double beta decay coming from the right-handed current can be comparable with the contributions coming from the standard left-handed sector only if the right-handed gauge boson mass is around 5 TeV, and with this operative scale of $W_R$ around few TeV, it is possible to probe at LHC. We have briefly commented on cosmological constraints coming from the BBN and Universe cosmology to the RH neutrinos involved in this discussion.

View original: http://arxiv.org/abs/1212.0612