Measurement of Exclusive Photoproduction from Protons in Pb Collisions at

The exclusive photoproduction of meson states from protons, (with ), is studied in ultraperipheral Pb collisions at a centre-of-mass energy per nucleon pair of . The measurement is performed using the decay mode, with data collected by the CMS experiment corresponding to an integrated luminosity of 32.6 . Differential cross sections as functions of the transverse momentum squared , and rapidity , are presented. The photoproduction cross section is extracted in the rapidity range , which corresponds to photon-proton centre-of-mass energies in the range . The data are compared to theoretical predictions based on perturbative quantum chromodynamics and to previous measurements.