Dark photon pair production via off-shell dark Higgs at FASER

Abstract

We consider a dark photon model in which the dark U(1) gauge symmetry is spontaneously broken by a vacuum expectation value of a new scalar boson. We focus on the ForwArd Search ExpeRiment (FASER) and calculate its sensitivity to the dark photon produced from the off-shell decay of the new scalar boson. It is found that the off-shell production extends the sensitivity region beyond the kinematical threshold of the on-shell decay of the scalar boson, and that the sensitivity region can be spanned to unexplored region. We also show the parameter space in which perturbative calculation is valid for the unitarity of an S matrix.

arXiv comment19 pages, 4 figures, 1 table; v2: figure 5 added to published version

References in corpus (28)

• Secluded WIMP Dark Matter
• Secluded U(1) below the weak scale
• FASER: ForwArd Search ExpeRiment at the LHC
• Implications of Generalized Z-Z' Mixing
• Hunting All the Hidden Photons
• Serendipity in dark photon searches
• Search for $A^{\prime }\to {\mu }^{+}{\mu }^{-}$ decays
• Strong Constraints on Sub-GeV Dark Matter from SLAC Beam Dump E137
• Decay and Detection of a Light Scalar Boson Mixing with the Higgs
• Accelerating the Discovery of Light Dark Matter
• Unbroken B-L Symmetry
• The Forward Physics Facility: Sites, Experiments, and Physics Potential
• New Electron Beam-Dump Experiments to Search for MeV to few-GeV Dark Matter
• Phenomenology of a very light scalar (100 MeV $<m_h<$ 10 GeV) mixing with the SM Higgs
• Constraints on Dark Photon from Neutrino-Electron Scattering Experiments
• Heavy Neutral Leptons at FASER
• Dark Higgs Bosons at FASER
• ALPs at FASER: The LHC as a Photon Beam Dump
• DAEdALUS and Dark Matter Detection
• FORESEE: FORward Experiment SEnsitivity Estimator for the LHC and future hadron colliders
• Galactic 511 keV line from MeV millicharged dark matter
• Dark Higgs Bosons at Colliders
• Constraining Light Bosons with Radiative ${\rm Y}(1S)$ Decays
• Constraints on the $U(1{)}_L$ gauge boson in a wide mass range
• Dark Photon from Light Scalar Boson Decays at FASER
• (In)Visible signatures of the minimal dark abelian gauge sector
• Search for Lepton Flavor Violating Decay at FASER
• Search for $Z^{\prime }$ pair production from scalar boson decay in minimal $U(1{)}_{L_{\mu }-L_{\tau }}$ model at the LHC