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Diphoton Signals of Muon-philic Scalars at DarkQuest

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arxiv 2405.17651 v2 pith:TZWG54OA submitted 2024-05-27 hep-ph hep-ex

Nikita Blinov , Stefania Gori , Nick Hamer This is my paper · ORCID
classification hep-phhep-ex
keywords darkquestscalarsbackgrounddumpmuon-philicphotonsaddressanalyze
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We analyze the unique capability of the DarkQuest proton beam-dump experiment at Fermilab to discover new light resonances decaying into photons. As an example model, we focus on muon-philic scalar particles that decay to photons. This is one of the few minimal models that can address the $(g-2)_\mu$ anomaly at low mass. These scalars can be copiously produced by meson decays and muon bremsstrahlung. We point out that thanks to DarkQuest's compact geometry, muons can propagate through the dump and efficiently produce dark scalars near the end of the dump. This mechanism enables DarkQuest to be sensitive to both long-lived and prompt scalars. At the same time, di-photon signatures are generically not background free, and we discuss in detail the different sources of background and strategies to mitigate them. We find that the backgrounds can be sufficiently reduced for DarkQuest to test currently-viable $(g-2)_\mu$ parameter space.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Muon Bremsstrahlung as a New Probe of Dark Sector at Neutrino Experiments

    hep-ph 2026-07 conditional novelty 7.0 of 10

    Muon bremsstrahlung from the focused muon beam at neutrino facilities can produce heavy neutral leptons up to ~1 GeV, opening new search territory for SBND and DUNE Near Detector.

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

    hep-ph 2025-01 conditional novelty 6.0 of 10

    FASER and FASER2 could probe unconstrained muonphilic scalar masses below the dimuon threshold, including the (g-2)_mu favored region, using diphoton and muon-plus-diphoton signals.

  3. Constraining self-interacting ultrahigh-energy muon neutrinos by cosmic microwave background spectral distortion

    astro-ph.CO 2025-06 conditional novelty 4.0 of 10

    Scalar-mediated scattering of PeV muon neutrinos on the cosmic neutrino background injects photon energy that distorts the CMB, giving coupling bounds g_nu_mu of about 10^-4 to 10^-5 with projected PIXIE sensitivities...

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