Abstract
The exclusive photoproduction of Υ (nS) meson states from protons, γp→Υ(nS)p (with n = 1 , 2 , 3), is studied in ultraperipheral p Pb collisions at a centre-of-mass energy per nucleon pair of sNN=5.02TeV. The measurement is performed using the Υ (nS) → μ+μ- decay mode, with data collected by the CMS experiment corresponding to an integrated luminosity of 32.6nb-1. Differential cross sections as functions of the Υ (nS) transverse momentum squared pT2, and rapidity y, are presented. The Υ (1 S) 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<Wγp<826GeV. The data are compared to theoretical predictions based on perturbative quantum chromodynamics and to previous measurements.
Original language | English (US) |
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Article number | 277 |
Journal | European Physical Journal C |
Volume | 79 |
Issue number | 3 |
DOIs | |
State | Published - Mar 1 2019 |
Bibliographical note
Publisher Copyright:© 2019, CERN for the benefit of the CMS collaboration.
Keywords
- CMS
- UPC
- Y
- pPb
- photoproduction