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

Journal Article · · Journal of High Energy Physics (Online)
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

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.

Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-95ER40896
OSTI ID:
1507139
Journal Information:
Journal of High Energy Physics (Online), Vol. 2017, Issue 10; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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