  The exclusive photoproduction of $\Upsilon$(nS) meson states from protons,
$\gamma$p $ \to\Upsilon$(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
$\Upsilon$(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 $\Upsilon$(nS) transverse
momentum squared $p_\mathrm{T}^2$, and rapidity $y$, are presented. The
$\Upsilon$(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.

High Energy Physics - Experiment