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Study of Drell-Yan dimuon production in proton-lead collisions at root s(NN)=8.16 TeV

Abstract: 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 8.16TeV. A data sample recorded with the CMS detector at the LHC is used, corresponding to an integrated luminosity of 173 nb?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 and of a geometric variable __ are measured, where __ highly correlates with pT 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.

 Fuente: Journal of High Energy Physics, 2021, 05, 182

 Editorial: Springer Verlag

 Fecha de publicación: 20/05/2021

 Nº de páginas: 47

 Tipo de publicación: Artículo de Revista

 DOI: 10.1007/JHEP05(2021)182

 ISSN: 1126-6708,1029-8479