Hadrophilic Dark Sectors at the Forward Physics Facility

Abstract

Models with light dark sector and dark matter particles motivate qualitatively new collider searches. Here we carry out a comprehensive study of hadrophilic models with U(1)${}_B$ and U(1)${}_{B-3L_{\tau }}$ gauge bosons coupled to light dark matter. The new mediator particles in these models couple to quarks, but have suppressed couplings to leptons, providing a useful foil to the well-studied dark photon models. We consider current bounds from accelerator and collider searches, rare anomaly-induced decays, neutrino non-standard interactions, and dark matter direct detection. Despite the many existing constraints, these models predict a range of new signatures that can be seen in current and near future experiments, including dark gauge boson decays to the hadronic final states ${\pi }^{+}{\pi }^{-}{\pi }^0$, ${\pi }^0\gamma$, $K^{+}{K}^{-}$, and $K_S{K}_L$ in FASER at LHC Run 3, enhancements of ${\nu }_{\tau }$ scattering rates in far-forward neutrino detectors, and thermal dark matter scattering in FLArE in the HL-LHC era. These models therefore motivate an array of different experiments in the far-forward region at the LHC, as could be accommodated in the proposed Forward Physics Facility.

arXiv commentv2: Updated to PRD version, results unchanged v3: Corrected a minor typo in Eq. 13, results unchanged

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