May 13 – 19, 2018
Venice, Italy
Europe/Zurich timezone
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Measurement of exclusive Upsilon photoproduction off protons in pPb collisions at sqrt(s_NN) = 5.02 TeV with CMS

May 14, 2018, 4:30 PM
Sala Volpi, 1st Floor (Palazzo del Casinò)

Sala Volpi, 1st Floor

Palazzo del Casinò

Parallel Talk Initial state physics and approach to equilibrium Initial state physics and approach to equilibrium


Ruchi Chudasama (Bhabha Atomic Research Centre (IN))


Exclusive photoproduction of Upsilon(nS) meson states off protons is measured in ultraperipheral pPb collisions at a center-of-mass energy per nucleon pair of 5.02 TeV. The measurement is carried out in the $\Upsilon (nS)\to\mu^+\mu^-$ decay modes, with data collected by the CMS experiment corresponding to an integrated luminosity of $32.6$~nb$^{-1}$. Differential cross sections, as a function of the $\Upsilon$(nS) transverse momentum squared $p_{T}^2$, and rapidity $y$, are presented. The $\Upsilon$(1S) photoproduction cross section is extracted as a function of the photon-proton center-of-mass energy over the $91 < W_{\gamma p}<826$~GeV range. The data are compared to theoretical perturbative quantum chromodynamics predictions and to previous measurements.

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