Neutrinos Masses and Mixing, Low Energy Leptonic CP Violation, High and Low Scale Leptogenesis and Beyond

by Prof. S. T. Petcov (INFN/SISSA, Trieste, Italy, Kavli IPMU, University of Tokyo, Japan)

Monday 23 Sept 2024, 10:00 → 11:30 Asia/Shanghai

Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee Institute)

Abstract

Aspects of High-Scale and Low-Scale leptogenesis theory will be discussed. After summarising the current status of neutrino physics and the principal goals of the future research in this field, we will consider the type I seesaw mechanism of neutrino mass generation on which leptogenesis is based and comment on the possible origins of CP-violation in leptogenesis. An integral part of the type I seesaw mechanism and leptogenesis are the heavy Majorana neutrinos, whose masses determine the scale of leptogenesis; their phenomenology will be briefly outlined.The theory of high-scale leptogenesis will be reviewed and examples of results of successful generation of the baryon asymmetry of the Universe (BAU) will be given. It will be shown that it is possible to reproduce the observed value of BAU even in the case when the CP-violation is provided in leptogenesis exclusively by the Dirac or/and Majorana CP-violation phases present in PMNS neutrino mixing matrix. We will comment on the compatibility of high-scale leptogenesis with the so-called "Neutrino Option" scenario. Low-scale leptogenesis and the possibilities to test it experimentally will be also briefly reviewed.

Biography

Prof. Petcov completed his PhD at Laboratory of Theoretical Physics, JINR, Dubna, USSR, in 1977 and became a Professor at SISSA, Trieste, Italy, in 1994. Prof. Petcov has made notable contributions in the fields of neutrino, particle and astrophysicle physics (such as the Vector Boson Fusion (VBF) mechanism of Higgs boson production (1979); the existence of  Majorana CP-violating phases in the lepton mixing matrix (1980); the novel method of neutrino mass ordering determination using reactor neutrinos, on which the JUNO experiment is based (2001); a novel mechanism of resonance-like enhancement of the Extra open brace or missing close bracetransitions of neutrinos crossing the Earth core (NOLR, 1998)), used in neutrino tomography of the Earth). Prof. Petcov has won the Pontecorvo Prize for the year 2010 for fundamental contribution to the investigation of neutrino propagation in matter, μ→e+γ, μ→3e processes and Majorana properties of neutrinos (that is awarded by the Joint Institute of Nuclear Research, Dubna, Russia).