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Title: Radiative decays of the Higgs boson to a pair of fermions

Abstract

We revisit the radiative decays of the Higgs boson to a fermion pair h→ff¯γ where f denotes a fermion in the Standard Model (SM). We include the chirality-flipping diagrams via the Yukawa couplings at the order O(y2fα), the chirality-conserving contributions via the top-quark loops of the order O(y2tα3), and the electroweak loops at the order O(α4). The QED correction is about Q2f × O(1%) and contributes to the running of fermion masses at a similar level, which should be taken into account for future precision Higgs physics. The chirality-conserving electroweak-loop processes are interesting from the observational point of view. First, the branching fraction of the radiative decay h → μ + μ γ is about a half of that of h → μ + μ , and that of h → e + e γ is more than four orders of magnitude larger than that of h → e + e , both of which reach about 10–4. The branching fraction of h → τ + τ γ is of the order 10–3. All the leptonic radiative decays are potentially observable at the LHC Run 2 or the HL-LHC. The kinematic distributions for the photon energy or the fermionmore » pair invariant mass provide non-ambiguous discrimination for the underlying mechanisms of the Higgs radiative decay. We also study the process h→cc¯γ and evaluate the observability at the LHC. We find it potentially comparable to the other related studies and better than the h → J/ψ γ channel in constraining the charm-Yukawa coupling.« less

Authors:
ORCiD logo [1];  [2]
  1. Univ. of Pittsburgh, Pittsburgh, PA (United States). Dept. of Physics and Astronomy; Tsinghua Univ., Beijing (China). Dept. of Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China)
  2. Univ. of Pittsburgh, Pittsburgh, PA (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1507139
Grant/Contract Number:  
FG02-95ER40896
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 10; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Higgs Physics; Quark Masses and SM Parameters; Spontaneous Symmetry Breaking

Citation Formats

Han, Tao, and Wang, Xing. Radiative decays of the Higgs boson to a pair of fermions. United States: N. p., 2017. Web. doi:10.1007/jhep10(2017)036.
Han, Tao, & Wang, Xing. Radiative decays of the Higgs boson to a pair of fermions. United States. https://doi.org/10.1007/jhep10(2017)036
Han, Tao, and Wang, Xing. Thu . "Radiative decays of the Higgs boson to a pair of fermions". United States. https://doi.org/10.1007/jhep10(2017)036. https://www.osti.gov/servlets/purl/1507139.
@article{osti_1507139,
title = {Radiative decays of the Higgs boson to a pair of fermions},
author = {Han, Tao and Wang, Xing},
abstractNote = {We revisit the radiative decays of the Higgs boson to a fermion pair h→ff¯γ where f denotes a fermion in the Standard Model (SM). We include the chirality-flipping diagrams via the Yukawa couplings at the order O(y2fα), the chirality-conserving contributions via the top-quark loops of the order O(y2tα3), and the electroweak loops at the order O(α4). The QED correction is about Q2f × O(1%) and contributes to the running of fermion masses at a similar level, which should be taken into account for future precision Higgs physics. The chirality-conserving electroweak-loop processes are interesting from the observational point of view. First, the branching fraction of the radiative decay h → μ + μ –γ is about a half of that of h → μ + μ –, and that of h → e + e – γ is more than four orders of magnitude larger than that of h → e + e –, both of which reach about 10–4. The branching fraction of h → τ + τ –γ is of the order 10–3. All the leptonic radiative decays are potentially observable at the LHC Run 2 or the HL-LHC. The kinematic distributions for the photon energy or the fermion pair invariant mass provide non-ambiguous discrimination for the underlying mechanisms of the Higgs radiative decay. We also study the process h→cc¯γ and evaluate the observability at the LHC. We find it potentially comparable to the other related studies and better than the h → J/ψ γ channel in constraining the charm-Yukawa coupling.},
doi = {10.1007/jhep10(2017)036},
journal = {Journal of High Energy Physics (Online)},
number = 10,
volume = 2017,
place = {United States},
year = {2017},
month = {10}
}

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