Photoproduction of the double $J/\psi$ (${\rm Y}$) at the LHC with forward proton tagging

Abstract

We calculate the photoproduction of double $J/\psi$ (${\rm Y}$) to leading order based on the nonrelativistic quantum chromodynamics factorization framework at the Large Hadron Collider with forward proton tagging. The numerical results of double $J/\psi$ photoproduction pp $\to$ p$\gamma$p $\to$ $J/\psi$ + $J/\psi$ with different forward detector acceptances ($\xi$) are presented. The total cross section of double $J/\psi$ photoproduction is less than 200 fb with 0.1 $<$ $\xi$ $<$ 0.5, but can reach about 1.37(1.27) pb with 0.0015 $<$ $\xi$ $<$ 0.5 ( 0.0015 $<$ $\xi$ $<$ 0.15 ). The double $J/\psi$ photoproduction may have the potential to be detected and provide an interesting signature, thus is useful for studying the mechanism of heavy quarkonium production. We also predict the double ${\rm Y}$ photoproduction and find they are, unfortunately, small (with less than 10 fb).

arXiv comment11 pages, 7 figures, version as it appears in Phys.Rev.D

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