Diphoton signals of muon-philic scalars at DarkQuest

Blinov, Nikita; Gori, Stefania; Hamer, Nick

doi:10.1103/PhysRevD.110.075006

Title: Diphoton signals of muon-philic scalars at DarkQuest

Journal Article · 10 October 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.110.075006 · OSTI ID:2462835

;

; Hamer, Nick

We analyze the 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 $(g - 2)_{μ}$ 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, diphoton 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 $(g - 2)_{μ}$ parameter space. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0023093; SC0010107

OSTI ID:: 2462835

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 7 Vol. 110; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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