FACET: A new long-lived particle detector in the very forward region of the CMS experiment

Abstract

We describe a proposal to add a set of very forward detectors to the CMS experiment for the high-luminosity era of the Large Hadron Collider to search for beyond the standard model long-lived particles, such as dark photons, heavy neutral leptons, axion-like particles, and dark Higgs bosons. The proposed subsystem is called FACET for Forward-Aperture CMS ExTension, and will be sensitive to any particles that can penetrate at least 50 m of magnetized iron and decay in an 18 m long, 1 m diameter vacuum pipe. The decay products will be measured in detectors using identical technology to the planned CMS Phase-2 upgrade.

15 pages, 6 figures, in print in JHEP. The resubmission has corrected Figs. 2,5,6, as well as a few additions as a result of addressing the referee comments. It matches the final version, to appear in JHEP

References in corpus (12)

• Feebly-Interacting Particles:FIPs 2020 Workshop Report
• Dark photon limits: a handbook
• Revised constraints and Belle II sensitivity for visible and invisible axion-like particles
• Search for $A^{\prime }\to {\mu }^{+}{\mu }^{-}$ decays
• Conceptual Design Report for the LUXE Experiment
• FORESEE: FORward Experiment SEnsitivity Estimator for the LHC and future hadron colliders
• FORMOSA: Looking Forward to Millicharged Dark Sectors
• Sensitivity to millicharged particles in future proton-proton collisions at the LHC
• Looking forward to test the KOTO anomaly with FASER
• Search for sub-millicharged particles at J-PARC
• Dark Photon from Light Scalar Boson Decays at FASER
• Enhanced long-lived dark photon signals at lifetime frontier detectors

Cited by in corpus (36)

• Dark Higgs Bosons at Colliders
• Sensitivities to feebly interacting particles: public and unified calculations
• Probing right-handed neutrinos dipole operators
• Long-lived heavy neutral leptons from mesons in effective field theory
• Reinterpretation of searches for long-lived particles from meson decays
• Long-lived neutral fermions at the DUNE near detector
• Energetic long-lived particles in the CMS muon chambers
• Searches for long-lived dark photons at proton accelerator experiments
• Probing HNL-ALP couplings at colliders
• Probing some photon portals to new physics at intensity frontier experiments
• Searching for a Single Photon from Lightest Neutralino Decays in R-parity-violating Supersymmetry at FASER
• Exploring the potential of FCC-hh to search for particles from $B$ mesons
• Testing the seesaw mechanisms via displaced right-handed neutrinos from a light scalar at the HL-LHC
• Searching for inelastic dark matter with future LHC experiments
• Enhanced long-lived dark photon signals at lifetime frontier detectors
• Sensitivity of the FACET experiment to Heavy Neutral Leptons and Dark Scalars
• Measuring lepton number violation in heavy neutral lepton decays at the future muon collider
• Searches for axion-like particles via $\gamma \gamma$ fusion at future ${\mathrm{e}}^{+}{\mathrm{e}}^{-}$ colliders
• New Physics Search at the CEPC: a General Perspective
• Testing Neutrino Dipole Portal by Long-lived Particle Detectors at the LHC
• Recasting Bounds on Long-lived Heavy Neutral Leptons in Terms of a Light Supersymmetric R-parity Violating Neutralino
• Unitarity Constraints and Collider Searches for Dark Photons
• Search for Lepton Flavor Violating Decay at FASER
• Searching for heavy neutral leptons coupled to axion-like particles at the LHC far detectors and SHiP
• Modelling Heavy Neutral Leptons in Accelerator Beamlines
• Probing light sterile neutrinos in left-right symmetric models with displaced vertices and neutrinoless double beta decay
• Dark Vector Mesons at LHC Forward Detector Searches
• SHIFT@LHC: Searches for New Physics with Shifted Interaction on a Fixed Target at the Large Hadron Collider
• ALPs and HNLs at LHC and Muon Colliders: Uncovering New Couplings and Signals
• Search for exotic long-lived particles at CLIC
• Right handed neutrino production from $Z^{\prime }$ interactions in forward search experiments
• Production of Chern-Simons bosons in decays of mesons
• Looking forward to forward physics at the CERN's LHC
• PREFACE: A search for long-lived particles at the Large Hadron Collider
• Long-lived Light Mediators in a Higgs Portal Model at the FCC-ee
• Divergences in the effective loop interaction of the Chern-Simons bosons with leptons. The unitary gauge case