Date
February 20 (Thu) at 13:00 - 14:30, 2025 (JST)
Speaker
Language
English
Host
Tsukasa Tada

It is fundamental in particle physics if the neutrino is a Dirac fermion or a Majorana fermion, and the seesaw model gives naturally a Majorana
neutrino in an extension of the Standard Model. However, the commonly used chirality changing \(pseudo-C symmetry \) \(\nu^{\tilde C}_L=C\overline{\nu_L}^T\)
of a chiral fermion is not defined in Lagrangian field theory. Precisely speaking, the neutrinoless double beta decay is not described by the pseudo-C symmetry. The Majorana neutrino obtained after a Bogoliubov-type canonical transformation, which is the one originally defined by Majorana using a Dirac-type fermion, describes
consistently all the properties expected for the Majorana neutrino. Physical implication of this fact is briefly discussed.

Reference

  1. K. Fujikawa and A. Tunearu, Two classes of Majorana neutrinos in the seesaw model, Physics Letters, B858, 139064 (2024), doi: 10.48550/arXiv.2405.18702, arXiv: 2405.18702

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