HEP2026: 42nd Conference on Recent Developments in High Energy Physics and Cosmology [NTUA] Jul 8 – 11, 2026

SMEFT Analysis of Exclusive Higgs Decays H → Mγ

10 Jul 2026, 12:40

20m

Main Hall (Level 1) (National Technical University of Athens)

Theory

Speaker

Dimitrios Beis

Description

Rare exclusive Higgs decays H → Mγ, with M = ρ, ω, ϕ, J/ψ, Υ, provide a clean probe of Higgs–quark interactions and possible SMEFT effects. We study the dimension-six operators contributing to these channels and classify their impact into direct, indirect and dipole-contact contributions. Particular emphasis is placed on electroweak quark dipole operators, which can modify the branching ratios and are constrained by Higgs, electroweak and flavour observables, including B → Xsγ for third-generation down-type dipoles. The analysis shows that H → Mγ decays offer complementary sensitivity to CP-even flavour-diagonal electroweak dipoles, especially for light- and second-generation quarks.

Presentation materials

h_to_vgamma_HEP2026.pdf