Measurement of Exclusive Υ Photoproduction from Protons in p Pb Collisions at √sNN = 5.02 TeV

European Physical Journal C 2019
Viesturs Veckalns, et al 100

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.

Keywords
CMS, photoproduction, pPb, UPC, Y
DOI
10.1140/epjc/s10052-019-6774-8
Hyperlink
https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-019-6774-8

Veckalns, V., 100, e. Measurement of Exclusive Υ Photoproduction from Protons in p Pb Collisions at √sNN = 5.02 TeV. European Physical Journal C, 2019, Vol. 79, No. 3, pp.1-10. ISSN 1434-6044. e-ISSN 1434-6052. Available from: doi:10.1140/epjc/s10052-019-6774-8

Publication language
English (en)