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Aug 19 – 23, 2024
京都大学基礎物理学研究所
Asia/Tokyo timezone

Bayesian Exploration of Froggatt-Nielsen Mechanism

Aug 22, 2024, 3:45 PM
30m
パナソニックホール (京都大学基礎物理学研究所)

パナソニックホール

京都大学基礎物理学研究所

口頭発表

Speaker

Keiichi Watanabe (ICRR, U. Tokyo)

Description

The Froggatt-Nielsen (FN) mechanism is a compelling explanation for the hierarchical structures observed in the Yukawa couplings of fermions.
In this mechanism, the above structures are realized by imposing different U(1) charges for each generation of fermions under a new U(1) flavor symmetry. So far, several FN charge assignments have been proposed in the literature where the charge assignments have typically been determined in a heuristic way. However, it is difficult to quantitatively determine which FN charge assignment is ``good.''
Besides, only a limited number of FN charge possibilities have been discussed. In this talk, we discuss the selection of phenomenologically valid FN charges within the Standard Model, considering both the seesaw mechanism and effective dimension-five operators for the neutrino masses.
We adopt Bayesian statistics in our method to conduct a thorough examination of FN charge assignments.

Primary authors

Keiichi Watanabe (ICRR, U. Tokyo) Masahiro Ibe (ICRR, The University of Tokyo) Satoshi Shirai (Kavli IPMU)

Presentation materials

There are no materials yet.