Hierarchical structure of physical Yukawa couplings from matter field Kähler metric

Keiya Ishiguro, Tatsuo Kobayashi, Hajime Otsuka

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We study the impacts of matter field Kähler metric on physical Yukawa couplings in string compactifications. Since the Kähler metric is non-trivial in general, the kinetic mixing of matter fields opens a new avenue for realizing a hierarchical structure of physical Yukawa couplings, even when holomorphic Yukawa couplings have the trivial structure. The hierarchical Yukawa couplings are demonstrated by couplings of pure untwisted modes on toroidal orbifolds and their resolutions in the context of heterotic string theory with standard embedding. Also, we study the hierarchical couplings among untwisted and twisted modes on resolved orbifolds.

Original languageEnglish
Article number64
JournalJournal of High Energy Physics
Issue number7
Publication statusPublished - Jul 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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