LASNPA & WONP-NURT 2017

Theoretical challenges in double beta decay

27 Oct 2017, 08:30

30m

Room "Benigno Souza"

Plenary Talk High Energy Physics, Astrophysics and Cosmology (covering Hadron Structure, Phases of Nuclear Matter, QCD, Precision Measurements with Nuclei, Fundamental Interactions and Neutrinos) Plenary Talks

Speaker

Sabin Stoica (International Centre for Advanced Training and Research in Physics, Horia Hulubei National Institute of Physics and Nuclear Engineering)

Description

Double beta decay (DBD) is a nuclear process with the longest lifetime measured until present, which study presents a great interest. Indeed, its possible neutrinoless double beta (0νββ) decay mode 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 [1]. Theoretically, the study of 0νββ decay involves the accurate computation of the nuclear matrix elements (NME) and phase space factors (PSF), two key quantities entering the lifetimes of this process. In my talk I will make first a short review on the actual challenges to calculate the NME and PSF for DBD [2]-[4]. Then, I will show how from the study of 0νββ decay one can constrain BSM parameters related to the neutrino mass and Lorentz violation in weak decays.
References
1. Vergados, J.D., Ejiri, H., and Simkovic, F, Rep. Prog. Phys., 72, 106201 (2012).
2. M. Horoi and S. Stoica, Phys. Rev. C 81, 024321 (2010).
3. S. Stoica and M. Mirea, Phys. Rev. C 88, 037303 (2013).
4. A. Neacsu and S. Stoica, J. Phys.G 41, 015201 (2014).
5. S. Stoica and A. Neacsu, AHEP2014, 2014, article ID 745082.
6. S.Stoica, INPC2016, 12-16 September, 2016, Adelaide (oral presentation).
7. S. Stoica, MEDEX’17, May 29 – June 2, 2017, Prague (invit. lecture).