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Light in the beam dump -- ALP production from decay photons in proton beam-dumps
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Light in the beam dump -- ALP production from decay photons in proton beam-dumps
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The exploration of long-lived particles in the MeV-GeV region is a formidable task but it may provide us a unique access to dark sectors. Fixed-target facilities with sufficiently energetic and intense proton beams are an ideal tool for this challenge. In this work we show that the production rate of Axion-Like-Particles (ALPs) coupled pre-dominantly to photons receives a significant contribution from daughter-photons of secondary $\pi^0$ and $\eta$ mesons created in the proton shower. We carefully compare the PYTHIA simulated spectra of such secondaries to experimental literature, compute the ALP flux from the Primakoff conversion of these photons, and finally revisit existing limits on ALPs and update the prospects for a set of existing and future searches. Our results show that taking this production mechanism into account significantly enhances the sensitivity compared to previous studies based on coherent ALP production in primary proton-nucleus interactions.
Forward citations
Cited by 8 Pith papers
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Searching for long-lived ALPs with a laser-assisted optical dump
A laser-assisted optical dump could probe ALP-electron couplings down to ~10^-6 (10^-7) GeV^-1 with 16.5 (125) GeV electron beams, and when both couplings are present the Primakoff process improves the electron-coupli...
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Bounds on massive graviton-like particles from searches for axion-like particles coupling to photons
Limits on axion-like particles from photon-coupling searches are recast as constraints on massive graviton-like particles across lab, astrophysical, and cosmological experiments using analogous Primakoff and Gertsensh...
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The DAMSA Experiment
DAMSA proposes an ultra-short baseline accelerator experiment to detect short-lived dark sector messengers by overcoming the sensitivity ceiling of longer-baseline beam dump experiments through a compact detector design.
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Loop-Level Lepton Flavor Violation and Diphoton Signals in the Minimal Left-Right Symmetric Model
Recasting axion limits onto the one-loop H3 couplings of the minimal left-right symmetric model excludes the right-handed scale up to 2×10^9 GeV and could eventually probe 6×10^11 GeV.
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Detector performance at SHiP for cascade-produced long-lived particles
Cascade LLPs in SHiP suffer strong acceptance suppression, yielding at most moderate enhancement over primary production for light ALPs and subdominant contribution for HNLs from secondary kaons.
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Sensitivity of the FCC-ee to axion-like particles at different center-of-mass energies
FCC-ee can reach ALP-photon couplings of a few 10^{-6} GeV^{-1} at the Z pole and 10^{-5} GeV^{-1} at higher runs for masses 5-320 GeV in the associated production plus diphoton decay channel.
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Sensitivity of the FCC-ee to axion-like particles at different center-of-mass energies
FCC-ee can probe ALP-photon couplings down to a few 10^{-6} GeV^{-1} at the Z pole and ~10^{-5} GeV^{-1} at higher energies for ALP masses 5-320 GeV in the three-photon channel.
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Search for Sub-GeV Axion-Like Particles at EBES Pilot Run Using 4 GeV Positron Beam at KEK LINAC
No events observed in pilot run with 1.3e14 positrons on target, yielding new upper limits on sub-GeV ALP parameters via Primakoff production and diphoton decay.
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