Abstract
The first measurements of exclusive ϒ and ρ(770)0 vector meson photoproduction with the CMS detector at LHC in ultraperipheral proton-lead collisions at sNN=5.02TeV are presented. The ϒ(1S) cross section, which has been measured in the dumuon channel, is consistent with the updated ZEUS ep results at HERA. A fit of function A(Wγp[GeV]/400)δ to the CMS pPb measurement together with HERA ep and LHCb pp data gives the δ value, consistent with J/ψ photoproduction results. The obtained result provides a new insight for low-x gluon distribution in protons in an energyrange previously less constrained. The cross section for exclusive photoproduction of ρ(770)0 has been measured where ρ(770)0 decays to two pions. The obtained pomeron slope parameter, α′ = 0.28 ± 0.11(stat) ± 0.12(syst)GeV−2, is consistent with the ZEUS result and with the Gribov-Regge theory expectation.
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