LHC as a photon-photon collider: bounds on ${\Gamma }_{X\to \gamma \gamma }$

Abstract

In the relatively recent CMS data, there is a hint on the existence of a resonance with the mass 28 GeV coupling to muons. Such a resonance should also couple to photons through the fermion loop, therefore it can be searched for in ultraperipheral collisions (UPC) of protons. We set an upper bound on the $X\gamma \gamma$ coupling constant from the data on ${\mu }^{+}{\mu }^{-}$ pair production in UPC at the LHC. Our approach can be used for similar resonances should they appear in the future.

9 pages, 2 figures, 1 table; version accepted for publication in Physical Review D

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