Is the decay of the Higgs boson to a photon and a dark photon currently observable at the LHC?

Abstract

Many attempts have been made to observe the decay of the Higgs boson to a photon and an invisible massless dark photon. For this decay to be potentially observable at the LHC, new mediators that communicate between the Standard Model and the dark photon must exist. In this Letter, we study bounds on such mediators coming from the Higgs signal strengths, oblique parameters, electric dipole moment of the electron and unitarity. We find that the branching ratio of the Higgs boson to a photon and a dark photon is constrained to be far smaller than the sensitivity of current collider searches, thus calling for a reconsideration of current experimental efforts.

6 pages, 1 figure, matches published version

References in corpus (4)

• Dark photons and resonant monophoton signatures in Higgs boson decays at the LHC
• Vector-like Quark Interpretation for the CKM Unitarity Violation, Excess in Higgs Signal Strength, and Bottom Quark Forward-Backward Asymmetry
• Observation of electroweak production of two jets in association with an isolated photon and missing transverse momentum, and search for a Higgs boson decaying into invisible particles at 13 TeV with the ATLAS detector
• Search for dark photons in Higgs boson production via vector boson fusion in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Cited by in corpus (2)

• Observability of the Higgs boson decay to a photon and a dark photon
• Combination of searches for Higgs boson decays into a photon and a massless dark photon using $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector