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Very recently a novel implementation of type-II seesaw mechanism for neutrinomass has been proposed in SU(5) grand unified theory with a number of desirablenew physical phenomena beyond the standard model.Introducing heavy right-hadedneutrinos and extra fermion singlets, in this work we show how the type-I seeawcancellation mechanism works in this SU(5) framework. Besides predictingverifiable LFV decays, we further show that the model predicts dominant doublebeta decay with normal hierarchy or inverted hierarchy of active light neutrinomasses in concordance with cosmological bound. In addition, a novel mechanismfor heavy right-handed neutrino mass generation independent of type-II seesawpredicted mass hierarchy, is suggested in this work.

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