Work

Polarization-Dependent Observables in H → ℓ+ ℓ– γ in the SM

Year: 2025

Type: article

Abstract: The rare three-body decay of a Higgs boson to a lepton–antilepton pair and a photon has begun to attract attention, after the first evidence for the $H\rightarrow Z\gamma$ channel at CMS and ATLAS, which is a subprocess of $H \rightarrow \ell ^+ \ell ^- \gamma$. To investigate some important features of this process, we suggest that the polarized forward-backward and the photon polarization asymmetries could be useful to probe its important properties, such as the behavior of Yukawa coupling, resonance, and nonresonance contributions. Our analysis introduces a comprehensive framework to evaluate the aforementioned polarization-dependent observables. By analyzing the polarization effects of the final-state photon and lepton separately on forward-backward asymmetries, we demonstrate that loop-induced contributions play a significant role in investigating these asymmetries. Unlike the unpolarized case, where the interference effects of resonance and nonresonance effects are minimal, we show that polarization-dependent observables offer a powerful tool to analyze these features of this decay mode. Furthermore, these observables can provide a handy tool for probing possible signatures of physics beyond the SM.

Source: Progress of Theoretical and Experimental Physics

DOI: 10.1093/ptep/ptaf037

Authors: Usman Hasan, A Uzair, M Junaid, Bilal Tariq, Ishtiaq Ahmed, Shahin Iqbal

Institution: Abdus Salam Centre for Physics

Language: English

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $979

Funder: Sponsoring Consortium for Open Access Publishing in Particle Physics