Bounds on axion-like particles from fully merged photons at the LHC
Abstract
I show that, in the mass range 0.1\,GeV < ma < 6\,GeV, the strongest current bound on axion-like particles (ALPs) coupled to photons comes from very high energy aγ production at the LHC. In this regime, the two photons from the ALP decay are collimated and reconstructed as a single photon.
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