# High Scale Type-II Seesaw, Dominant Double Beta Decay within Cosmological Bound and LFV Decays in SU(‎5)

Parida, M. K.  (Centre for Excellence in Theoretical and Mathematical Sciences, Siksha ’O’ Anusandhan (SOA) Deemed to be University, Khandagiri Square, Bhubaneswar 751030, India) ; Satpathy, Rajesh (Centre for Excellence in Theoretical and Mathematical Sciences, Siksha ’O’ Anusandhan (SOA) Deemed to be University, Khandagiri Square, Bhubaneswar 751030, India)

03 February 2019

Abstract: Very recently novel implementation of type-II seesaw mechanism for neutrino mass has been proposed in $\mathrm{S}\mathrm{U}\left(\mathrm{5}\right)$ grand unified theory with a number of desirable new physical phenomena beyond the standard model. Introducing heavy right-handed neutrinos and extra fermion singlets, in this work we show how the type-I seesaw cancellation mechanism works in this $\mathrm{S}\mathrm{U}\left(\mathrm{5}\right)$ framework. Besides predicting verifiable LFV decays, we further show that the model predicts dominant double beta decay with normal hierarchy or inverted hierarchy of active light neutrino masses in concordance with cosmological bound. In addition a novel right-handed neutrino mass generation mechanism, independent of type-II seesaw predicted mass hierarchy, is suggested in this work.

Published in: Advances in High Energy Physics 2019 (2019) 3572862