Study of Drell-Yan dimuon production in proton-lead collisions at sNN=\sqrt{s_\mathrm{NN}} = 8.16 TeV

Collaboration
Feb 26, 2021
47 pages
Published in:
  • JHEP 05 (2021) 182
  • Published: May 20, 2021
e-Print:
Report number:
  • CMS-HIN-18-003,
  • CERN-EP-2021-028
Experiments:

Citations per year

2021202220232024202525712
Abstract: (Springer)
Differential cross sections for the Drell-Yan process, including Z boson production, using the dimuon decay channel are measured in proton-lead (pPb) collisions at a nucleon-nucleon centre-of-mass energy of 8.16 TeV. A data sample recorded with the CMS detector at the LHC is used, corresponding to an integrated luminosity of 173 nb1^{−1}. The differential cross section as a function of the dimuon mass is measured in the range 15–600 GeV, for the first time in proton-nucleus collisions. It is also reported as a function of dimuon rapidity over the mass ranges 15–60 GeV and 60–120 GeV, and ratios for the p-going over the Pb-going beam directions are built. In both mass ranges, the differential cross sections as functions of the dimuon transverse momentum pT_{T} and of a geometric variable ϕ^{*} are measured, where ϕ^{*} highly correlates with pT_{T} but is determined with higher precision. In the Z mass region, the rapidity dependence of the data indicate a modification of the distribution of partons within a lead nucleus as compared to the proton case. The data are more precise than predictions based upon current models of parton distributions.[graphic not available: see fulltext]
Note:
  • Hadron-Hadron scattering (experiments)
  • Relativistic heavy ion physics
  • dimuon: mass
  • dimuon: mass spectrum
  • Z0: hadroproduction
  • Z0: leptonic decay
  • differential cross section: mass: measured
  • mass dependence
  • rapidity dependence
  • transverse momentum dependence