Measurement of exclusive Υ\Upsilon photoproduction from protons in pPb collisions at sNN=\sqrt{s_\mathrm{NN}} = 5.02 TeV

Collaboration
Sep 28, 2018
36 pages
Published in:
  • Eur.Phys.J.C 79 (2019) 3, 277,
  • Eur.Phys.J.C 82 (2022) 4, 343 (erratum)
  • Published: Mar 26, 2019
e-Print:
Report number:
  • CMS-FSQ-13-009,
  • CERN-EP-2018-225
Experiments:

Citations per year

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Abstract: (Springer)
The exclusive photoproduction of Υ(nS)\mathrm {\Upsilon }\mathrm {(nS)} meson states from protons, γpΥ(nS)p\gamma \mathrm {p} \rightarrow \mathrm {\Upsilon }\mathrm {(nS)} \,\mathrm {p} (with n=1,2,3\mathrm {n}=1,2,3 ), is studied in ultraperipheral p\mathrm {p} Pb collisions at a centre-of-mass energy per nucleon pair of sNN=5.02TeV\sqrt{\smash [b]{s_{_{\mathrm {NN}}}}} = 5.02\,\text {TeV} . The measurement is performed using the Υ(nS)μ+μ\mathrm {\Upsilon }\mathrm {(nS)} \rightarrow \mu ^+\mu ^- decay mode, with data collected by the CMS experiment corresponding to an integrated luminosity of 32.6 nb1\,\text {nb}^{-1} . Differential cross sections as functions of the Υ(nS)\mathrm {\Upsilon }\mathrm {(nS)} transverse momentum squared pT2p_{\mathrm {T}} ^2 , and rapidity y, are presented. The Υ(1S)\mathrm {\Upsilon (1S)} photoproduction cross section is extracted in the rapidity range y<2.2|y |< 2.2 , which corresponds to photon–proton centre-of-mass energies in the range 91<Wγp<826GeV91<W_{\gamma \mathrm {p}} <826\,\text {GeV} . The data are compared to theoretical predictions based on perturbative quantum chromodynamics and to previous measurements.
Note:
  • CMS
  • UPC
  • photoproduction
  • Y
  • pPb
  • upsilon mesons: photoproduction
  • differential cross section: rapidity
  • differential cross section: measured
  • differential cross section: (transverse momentum dependence)
  • upsilon mesons: decay modes