Constraints of beyond Standard Model parameters from the study of neutrinoless double beta decay

¹ Horia Hulubei Foundation, P.O. Box MG12, 077125 Bucharest-Magurele, Romania
² Horia Hulubei Institute of Physics and Nuclear Engineering, P.O. Box MG6, 077125 Bucharest-Magurele, Romania

^a e-mail: stoica@nipne.ro

Published online: 5 December 2017

Abstract

Neutrinoless double beta (0νββ) decay is a beyond Standard Model (BSM) process whose discovery would clarify if the lepton number is conserved, decide on the neutrinos character (are they Dirac or Majorana particles?) and give a hint on the scale of their absolute masses. Also, from the study of 0νββ one can constrain other BSM parameters related to different scenarios by which this process can occur. In this paper I make first a short review on the actual challenges to calculate precisely the phase space factors and nuclear matrix elements entering the 0νββ decay lifetimes, and I report results of our group for these quantities. Then, taking advance of the most recent experimental limits for 0νββ lifetimes, I present new constraints of the neutrino mass parameters associated with different mechanisms of occurrence of the 0νββ decay mode.