Neutrino masses, oscillations, and 0νββ-decay
Fedor Šimkovic
Comenius University, Bratislava, Slovakia; IEAP, CTU in Prague
Abstract:
A new Quantum Field Theory (QFT) formalism for neutrino oscillations in a vacuum is proposed. The neutrino emission and detection are identified with the charged-current vertices of a single second-order Feynman diagram for the underlying process, enclosing neutrino propagation between these two points. The L-dependent master formula for the charged lepton production rate is derived, which provides the QFT basis for analyzing neutrino oscillations. The observation of neutrino oscillations and hence non-zero neutrino masses provided a milestone in the search for physics beyond the Standard Model. An open question remains whether neutrinos are Dirac or Majorana particles. A smoking-gun signature of Majorana neutrinos is the observation of neutrinoless double-beta decay (0νββ-decay. The recent progress in the experimental and theoretical study of 0νββ-decay is shortly reviewed. A mechanism of generating Majorana neutrino mass due to the spontaneous breaking of chiral symmetry and forming a quark condensate is presented. The present-day results of the double-beta decay nuclear matrix elements calculation are discussed. An impact of the quenching of the axial-vector coupling constant on double-beta decay processes is addressed. The related experimental and theoretical studies of single b-decay, 2νββ-decay, muon capture processes, and double-charge exchange nuclear reactions are also addressed.
Seminar takes place on Tuesday, June 6th 2023 at 2:00 PM
in the IEAP meeting room, Praha 1, Husova 240/5.
| Ing. Bartoloměj Biskup, Ph.D. seminar organizer |
doc. Ing. Ivan Štekl, CSc. director of IEAP |
doc. Dr. André Sopczak IEEE CS - NPSS chair |
NUCLEAR & PLASMA SCIENCES SOCIETY CHAPTER
IEEE Czechoslovakia section