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Cross-frontier meeting (AF - EF - RF): Dark sectors and Light Long-lived particles

Zoom connection link: Meeting ID: 998 3481 3707 Password: 986342
Caterina Doglioni (Lund University) , Eric Prebys (UC Davis) , Liantao Wang (University of Chicago) , Mike Lamont (CERN) , Mike Williams (MIT) , Richard Milner (MIT) , Simone Pagan Griso (Lawrence Berkeley National Laboratory) , Stefania Gori (UC Santa Cruz) , Tulika Bose (University of Wisconsin-Madison) , Zhen Liu (University of Maryland)

“Dark Sectors and Light Long-Lived Particles” meeting as one of the joint efforts across Energy Frontier (EF9, EF10), Rare-processes (RF6), and Accelerator Frontier (AF5) for the Snowmass 2021 process. 

The focus of the meeting will be to discuss physics probes of dark sector physics at different frontiers,  including light long-lived particles and common benchmarks that can be used for various studies. We anticipate hosting both overview talks and shorter contributions on the coverage at different colliders (including their external detectors) and intensity facilities (fixed targets, neutrino facilities, meson factories), as well as future accelerator programs and novel ideas. 

Zoom connection link: click here to connect
Meeting ID: 998 3481 3707
Password: 986342

Meeting notes/minutes and Zoom recordings of the session are available at

Google doc with the Q/A, zoom chat and OtterAI transcript:



  • Wednesday, 15 July
    • 11:00 AM 2:15 PM
      Day 1: Session
      • 11:00 AM
        Energy Frontier probes 20m
        Speaker: Juliette Alimena
      • 11:30 AM
        Probing LLPs and Dark Matter with MATHUSLA at the HL-LHC 10m
        Speaker: Henry Lubatti (University of Washington, Seattle)
      • 11:45 AM
        Codex-b 10m

        We intend to summarize recent progress on the CODEX-b proposal, including but not limited to the physics case, demonstrator detector (CODEX-beta) and simulation framework. This will include concrete first steps and a clear road map for the progression of the proposal towards a realized experiment. We very much welcome new collaborators, especially people with an interest in hardware development, simulation and event reconstruction.

        Speakers: Simon Knapen (Lawrence Berkeley National Lab and UC Berkeley) , Simon Knapen Knapen (Rutgers, the state university of New Jersey)
      • 12:00 PM
        milliQan, FerMINI, et al. 10m
        Speakers: Christopher Hill (The Ohio State University) , Christopher Hill (OSU) , Matthew Citron (Univ. of California Santa Barbara (US))
      • 12:15 PM
        FASERnu 10m

        The recently approved FASERnu detector is the first neutrino experiment at the LHC. It will detect over thousands of neutrino interactions during the upcoming Run 3 of the LHC, with typical neutrino energies of a TeV. It will measure neutrino cross sections at energies where they are currently unconstrained, will bound models of forward particle production, and could open a new window on physics beyond the standard model. As the first of its kind, FASERnu also paves the way for a high energy neutrino frontier program during the HL-LHC era, with higher luminosities and possibly larger detectors. We propose to explore the full SM and BSM physics potential of collider neutrino experiments at the LHC and future colliders, and look forward to many great ideas from the energy frontier community.

        Speaker: Felix Kling (SLAC)
      • 12:30 PM
        HNL at HL-LHC with the CMS Muon Spectrometer 10m

        Study of the sensitivity to long-lived heavy neutrinos (i.e Heavy Neutral Leptons or HNL) with the capabilities of the CMS muon system at the HL-LHC. The study of the reach for a long-lived neutrino - with a dedicated displaced trigger in the muon system - will have the advantage to detect fully hadronic decays of the HNL. We foresee this to be potentially optimal to study the tau sector in HNL models. This strategy would be complementary to track-based searches at ATLAS and CMS for displaced vertices from the neutrino decay (reconstructed either in the inner-trackers or muon systems).

        Speaker: Giovanna Cottin (Universidad Adolfo Ibañez (CL))
      • 12:45 PM
        CBETA 10m
        Speaker: Prof. Richard Milner (MIT)
      • 1:00 PM
        Forward Physics Facility 10m

        There is growing interest in the far forward region at the LHC. Detectors placed hundreds of meters downstream from existing interaction points along the beam collision axis may search for LLPs, detect thousands of TeV neutrinos, and make measurements of relevance for a broad range of topics, from hadronic physics to cosmic ray experiments. These efforts are currently limited to fit within existing tunnels, but one could imagine enlarging this space to create a Forward Physics Facility, which would allow more and larger experiments to be placed there, with a huge gain in sensitivity to new physics and standard model studies. In this talk, I would like to propose such a Facility, present some nascent ideas of what it could be good for, and stimulate physicists with a broad range of interests to come together to study the feasibility of creating such a Facility and explore the ways it could expand the existing LHC physics program.

        Speaker: Jonathan Feng (UC Irvine)
      • 1:15 PM
        AF5 Overview/ Fermilab Upgrade Opportunities 20m
        Speaker: Eric Prebys (UC Davis)
      • 1:35 PM
        Beam Dump Driven by Wakefield Accelerator 15m
        Speaker: Spencer Gessner (SLAC)
      • 1:50 PM
        Magnet and RF Needs for Hidden/Dark Sector Searches 10m
        Speaker: Daniel Bowring (Fermilab)