# ICHEP 2020

28 July 2020 to 6 August 2020
virtual conference
Europe/Prague timezone

## 0νββ in left-right theories with Higgs doublets and gauge coupling unification

29 Jul 2020, 13:33
3m
virtual conference

#### virtual conference

Poster 02. Neutrino Physics

### Speaker

Chayan Majumdar (Indian Institute of Technology Bombay)

### Description

We consider a version of Left-Right Symmetric Model in which the scalar sector consists of a Higgs bidoublet ($\Phi$) with $B-L=0$, Higgs doublets ($H_{L,R}$) with $B-L=1$ and a charged scalar ($\delta^+$) with $B-L=2$ leading to radiatively generated Majorana masses for neutrinos and thereby, leads to new physics contributions to neutrinoless double beta decay ($0\nu \beta \beta$). We show that such a novel framework can be embedded in a non-SUSY $SO(10)$ GUT leading to successful gauge coupling unification at around $10^{16}$GeV with the scale of left-right symmetry breaking around $10^{10}$GeV. The model can also be extended to have left-right symmetry breaking at TeV scale, enabling detection of $W_R, Z_R$ bosons in LHC and future collider searches. In the context of neutrinoless double beta decay, this model can saturate the present bound from GERDA and KamLAND-Zen experiments. Also, we briefly explain how keV-MeV range RH neutrino arising from our model can saturate various astrophysical and cosmological constraints and can be considered as warm Dark Matter (DM) candidate to address various cosmological issues. We also discuss on left-right theories with Higgs doublets without having scalar bidoublet leading to fermion masses and mixings by inclusion of vector like fermions.

### Primary author

Chayan Majumdar (Indian Institute of Technology Bombay)

### Co-authors

Dr Sudhanwa Patra (Indian Institute of Technology Bhilai) Ms Supriya Senapati (Indian Institute of Technology Bombay) Prof. Urjit A. Yajnik (Indian Institute of Technology Bombay)