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Search for photoproduction of axion-like particles at GlueX
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abstract
We present a search for axion-like particles, $a$, produced in photon-proton collisions at a center-of-mass energy of approximately 4 GeV, focusing on the scenario where the $a$-gluon coupling is dominant. The search uses $a\to\gamma\gamma$ and $a\to\pi^+\pi^-\pi^0$ decays, and a data sample corresponding to an integrated luminosity of 168 pb$^{-1}$ collected with the GlueX detector. The search for $a\to\gamma\gamma$ decays is performed in the mass range of $180 < m_a < 480$ MeV, while the search for $a\to\pi^+\pi^-\pi^0$ decays explores the $600 < m_a < 720$ MeV region. No evidence for a signal is found, and 90% confidence-level exclusion limits are placed on the $a$-gluon coupling strength. These constraints are the most stringent to date over much of the mass ranges considered.
Forward citations
Cited by 1 Pith paper
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Measurement of Downward-going Milli-charged particles beyond GZK cutoff at the Pierre Auger Observatory
The paper derives 90% C.L. upper limits on milli-charged kinetic mixing from a private fit to Auger hybrid data and claims a newly excluded region, but the analysis is not reproducible and the text is internally inconsistent.
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