Angular distribution and forward–backward asymmetry of the Higgs-boson decay to photon and lepton pair

Alexander Yu. Korchin; Vladimir A. Kovalchuk

doi:10.1140/epjc/s10052-014-3141-7

EPJ

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2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2014) 74: 3141
https://doi.org/10.1140/epjc/s10052-014-3141-7

Regular Article - Theoretical Physics

Angular distribution and forward–backward asymmetry of the Higgs-boson decay to photon and lepton pair

Alexander Yu. Korchin¹^,2^* and Vladimir A. Kovalchuk¹

¹ NSC ‘Kharkov Institute of Physics and Technology’, 61108 , Kharkiv, Ukraine
² V.N. Karazin Kharkiv National University, 61022 , Kharkiv, Ukraine

^* e-mail: korchin@kipt.kharkov.ua

Received: 5 August 2014
Accepted: 20 October 2014
Published online: 5 November 2014

Abstract

The Higgs-boson decay $h \rightarrow \gamma \ell ^+ \ell ^-$ for various lepton states $\ell = (e, \, \mu , \, \tau )$ is analyzed. The differential decay width and forward–backward asymmetry are calculated as functions of the dilepton invariant mass in a model where the Higgs boson interacts with leptons and quarks via a mixture of scalar and pseudoscalar couplings. These couplings are partly constrained from data on the decays to leptons, $h \rightarrow \ell ^+ \ell ^-$ , and quarks $h \rightarrow q \bar{q}$ (where $q = (c, \, b)$ ), while the Higgs couplings to the top quark are chosen from the two-photon and two-gluon decay rates. Nonzero values of the forward–backward asymmetry will manifest effects of new physics in the Higgs sector. The decay width and asymmetry integrated over the dilepton invariant mass are also presented.