ANUBIS: Proposal to search for long-lived neutral particles in CERN service shafts

Abstract

Long-lived particles are predicted by many extensions of the Standard Model and have been gaining interest in recent years. In this Letter we present a competitive proposal that substantially extends the sensitivity in lifetime by instrumenting the existing service shafts above the ATLAS or CMS experiments with tracking stations. For scenarios with electrically neutral long-lived particles with $m\gtrsim 1$~GeV, the lifetime reach is increased by 2-3 orders of magnitude compared to currently operating and approved future experiments at the LHC. A detector design proposal is outlined along with projected costs.

v3 has been revised in accordance with more advanced studies from arXiv:2510.26932

References in corpus (12)

• FASER: ForwArd Search ExpeRiment at the LHC
• Long-Lived Particles at the Energy Frontier: The MATHUSLA Physics Case
• Search for invisible decays of a Higgs boson produced through vector boson fusion in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• New Detectors to Explore the Lifetime Frontier
• Searching for Long-lived Particles: A Compact Detector for Exotics at LHCb
• Combination of searches for invisible Higgs boson decays with the ATLAS experiment
• Looking for milli-charged particles with a new experiment at the LHC
• Long-lived particles at the LHC: catching them in time
• Search for long-lived particles produced in $pp$ collisions at $\sqrt{s}=13$ TeV that decay into displaced hadronic jets in the ATLAS muon spectrometer
• Leveraging the ALICE/L3 cavern for long-lived exotics
• Search for long-lived particles using nonprompt jets and missing transverse momentum with proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Data-driven Model-independent Searches for Long-lived Particles at the LHC

Cited by in corpus (17)

• The Forward Physics Facility: Sites, Experiments, and Physics Potential
• The Search for Feebly-Interacting Particles
• Heavy neutral leptons at ANUBIS
• Heavy neutral leptons in effective field theory and the high-luminosity LHC
• R-parity Violation and Light Neutralinos at ANUBIS and MAPP
• Long-lived heavy neutral leptons at the LHC: four-fermion single-$N_R$ operators
• HECATE: A long lived particle detector concept for the FCC-ee or CEPC
• Enhancing Sensitivities to Long-lived Particles with High Granularity Calorimeters at the LHC
• Enhanced long-lived dark photon signals at lifetime frontier detectors
• Emerging Jets Displaced into the Future
• ALPs and HNLs at LHC and Muon Colliders: Uncovering New Couplings and Signals
• Searches for long-lived particles with the ANUBIS experiment
• LHC experiments for long-lived particles of the dark sector
• Inelastic Dark Matter at the Fermilab Short Baseline Neutrino Program
• Long-Lived Particles at Future Colliders
• Installation of proANUBIS -- a proof-of-concept demonstrator for the ANUBIS experiment
• Performance studies of thin gas gap Resistive Plate Chamber prototypes with low Global Warming Potential gases for the ANUBIS experiment