Higgs boson decay into a lepton pair and a photon: A roadmap to the discovery of H→Zγ and probes of new physics

Kachanovich, Aliaksei; Nierste, Ulrich; Nišandžić, Ivan (2022) Higgs boson decay into a lepton pair and a photon: A roadmap to the discovery of H→Zγ and probes of new physics. Physical Review D, 105 (1). ISSN 2470-0010

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Abstract

The decay H -> l(+)l(-) gamma, l = e, mu receives contributions from H -> Z[-> l(+) l(-)]gamma and a nonresonant contribution, both of which are loop induced. We describe how one can separate these subprocesses in a gauge-independent way, define the decay rate Gamma(H -> Z gamma), and extract the latter from differential H -> l(+)l(-)gamma branching ratios. For l = mu, also the tree decay rate, which is driven by the muon Yukawa coupling, is important. We propose kinematic cuts optimized to separate the three contributions, paving the way to the milestone (i) discovery of H -> Z gamma, (ii) discovery of H -> mu(+)mu(-)gamma vertical bar(tree), and (iii) quantification of new physics in both the effective H-Z-gamma and nonresonant H-l(+)-l(-)-gamma couplings

Item Type:	Article
Uncontrolled Keywords:	Higgs boson decays
Subjects:	NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Theoretical Physics Division
Depositing User:	Ivan Nišandžić
Date Deposited:	06 Feb 2024 12:59
URI:	http://fulir.irb.hr/id/eprint/8492
DOI:	10.1103/PhysRevD.105.013007

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