The LHC as a TeV Muon Beam Dump: Muonphilic Scalars at FASER

Abstract

The FASER experiment was designed to study long-lived dark sector particles and neutrinos traveling in the forward direction at the LHC. Neutrinos are predominantly produced from meson decays, which also result in an intense energetic flux of muons in the forward direction regularly observed by FASER. So far, these muons are treated only as backgrounds to neutrino and new physics studies, and extensive effort is required to suppress them. In this study, we consider the opposite scenario and use muons produced in the forward direction to produce new muonphilic scalars, which can then be searched for at the FASER detector. To minimize the backgrounds for this search, we make use of an upgraded preshower component, which is expected to be installed at FASER before the end of Run 3, and is capable of spatially resolving two energetic photons. We find that FASER, and its upgrade, FASER2 can probe currently unconstrained regions of parameter space, including regions that can potentially explain the $(g-2{)}_{\mu }$ anomaly. This highlights the physics opportunities that the intense TeV muon beam at the LHC can bring.

arXiv commentmatches published version

References in corpus (51)

• A Brief Introduction to PYTHIA 8.1
• MadGraph 5 : Going Beyond
• Final Report of the Muon E821 Anomalous Magnetic Moment Measurement at BNL
• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• The anomalous magnetic moment of the muon in the Standard Model
• The Muon g-2
• Leading hadronic contribution to the muon magnetic moment from lattice QCD
• Exploring Portals to a Hidden Sector Through Fixed Targets
• FASER: ForwArd Search ExpeRiment at the LHC
• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm
• FASER's Physics Reach for Long-Lived Particles
• Precise measurement of the e+ e- to pi+ pi- (gamma) cross section with the Initial State Radiation method at BABAR
• Precise Measurement of the e+ e- --> pi+ pi- (gamma) Cross Section with the Initial-State Radiation Method at BABAR
• Search for a muonic dark force at BABAR
• The Forward Physics Facility: Sites, Experiments, and Physics Potential
• Detecting and Studying High-Energy Collider Neutrinos with FASER at the LHC
• M${}^3$: A New Muon Missing Momentum Experiment to Probe $(g-2{)}_{\mu }$ and Dark Matter at Fermilab
• Supernova Muons: New Constraints on Z' Bosons, Axions, and ALPs
• ALPs at FASER: The LHC as a Photon Beam Dump
• Flavor-specific scalar mediators
• The Leptonic Higgs Portal
• Muon Beam Experiments to Probe the Dark Sector
• First Direct Observation of Collider Neutrinos with FASER at the LHC
• Probing Muonic Forces and Dark Matter at Kaon Factories
• Measurement of the $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}$ cross section from threshold to 1.2 GeV with the CMD-3 detector
• FORESEE: FORward Experiment SEnsitivity Estimator for the LHC and future hadron colliders
• Minimal Models for Dark Matter and the Muon g-2 Anomaly
• New Physics and the Proton Radius Problem
• Light-quark connected intermediate-window contributions to the muon $g-2$ hadronic vacuum polarization from lattice QCD
• Observation of collider muon neutrinos with the SND@LHC experiment
• Extending the reach of FASER, MATHUSLA, and SHiP towards smaller lifetimes using secondary particle production
• Search for Dark Photons with the FASER detector at the LHC
• Systematically Testing Singlet Models for $(g-2{)}_{\mu }$
• The FASER Detector
• Probing Leptophilic Dark Sectors at Electron Beam-Dump Facilities
• First Measurement of the ${\nu }_e$ and ${\nu }_{\mu }$ Interaction Cross Sections at the LHC with FASER's Emulsion Detector
• Search for a Dark Leptophilic Scalar at BABAR
• A Light Scalar Explanation of $(g-2{)}_{\mu }$ and the KOTO Anomaly
• The tracking detector of the FASER experiment
• Looking forward to test the KOTO anomaly with FASER
• Light Scalars at FASER
• ALP Searches at the LHC: FASER as a Light Shining through Walls Experiment
• Lepton-Flavor-Violating ALP Signals with TeV-Scale Muon Beams
• First Measurement of the Muon Neutrino Interaction Cross Section and Flux as a Function of Energy at the LHC with FASER
• Extending the Discovery Potential for Inelastic-Dipole Dark Matter with FASER
• Science and Project Planning for the Forward Physics Facility in Preparation for the 2024-2026 European Particle Physics Strategy Update
• Searching for Muonphilic Dark Sectors with Proton Beams
• New Searches for Muonphilic Particles at Proton Beam Dump Spectrometers
• Muonphilic Dark Matter explanation of gamma-ray galactic center excess: a comprehensive analysis
• Leptophilic Axion-like Particles at Forward Detectors
• Methodology to determine the spin-parity of muon-philic $X$ boson in $J/\psi \to {\mu }^{-}{\mu }^{+}X$ decay

Cited by in corpus (4)

• Deep-Inelastic Scattering at TeV Energies with LHC Muons
• Letter of Intent: The Forward Physics Facility
• A SHIFT of Perspective: Observing Neutrinos at CMS and ATLAS
• Investigating nuclear effects in lepton-ion DIS at the LHC