Measurement of exclusive ${\rm Y}$ photoproduction from protons in pPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV

Abstract

The exclusive photoproduction of ${\rm Y}$(nS) meson states from protons, $\gamma$p $\to {\rm Y}$(nS)p (with n = 1, 2, 3), is studied in ultraperipheral pPb collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV. The measurement is performed using the ${\rm Y}$(nS) $\to {\mu }^{+}{\mu }^{-}$ decay mode, with data collected by the CMS experiment corresponding to an integrated luminosity of 32.6 nb${}^{-1}$. Differential cross sections as functions of the ${\rm Y}$(nS) transverse momentum squared $p_{\mathrm{T}}^2$, and rapidity $y$, are presented. The ${\rm Y}$(1S) photoproduction cross section is extracted in the rapidity range $|y|$ $<$ 2.2, which corresponds to photon-proton centre-of-mass energies in the range 91 $<$ W${}_{\gamma \mathrm{p}}$ $<$ 826 GeV. The data are compared to theoretical predictions based on perturbative quantum chromodynamics and to previous measurements.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/FSQ-13-009 (CMS Public Pages)

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