One-loop expressions for h→ll¯γ in Higgs extensions of the Standard Model

Nov 14, 2023, 10:00 AM
30m
The Suites Hotel, Jeju Island, Korea

The Suites Hotel, Jeju Island, Korea

67 Jungmungwangwang-ro 72beon-gil, 특별자치도, Seogwipo-si, Jeju-do

Speaker

Khiem Hong Phan (Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City 700000, Vietnam; Faculty of Natural Sciences, Duy Tan University, Da Nang City 550000, Vietnam)

Description

A systematic study of one-loop contributions to the decay channels h→ll¯γ with l=νe,μ,τ,e,μ, performed in Higgs extended versions of the Standard Model, is presented in the 't Hooft-Veltman gauge. Analytic formulas for one-loop form factors are expressed in terms of the logarithm and di-logarithmic functions. As a result, these form factors can be reduced to those relating to the loop-induced decay processes h→γγ,Zγ, confirming not only previous results using different approaches but also close relations between the three kinds of the loop-induced Higgs decay rates. For phenomenological study, we focus on the two observables, namely the enhancement factors defined as ratios of the decay rates calculated between the Higgs extended versions and the standard model, and the forward-backward asymmetries of fermions, which can be used to search for Higgs extensions of the SM. We show that direct effects of mixing between neutral Higgs bosons and indirect contributions of charged Higg boson exchanges can be probed at future colliders.

Primary author

Khiem Hong Phan (Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City 700000, Vietnam; Faculty of Natural Sciences, Duy Tan University, Da Nang City 550000, Vietnam)

Presentation materials