Study of Drell-Yan Dimuon Production İn Proton-Lead Collisions At Root s(NN )=8.16 TeV

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Tarih

2021

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Yayıncı

Springer Verlag [Commercial Publisher]

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Özet

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 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 p(T), and of a geometric variable phi* are measured, where phi* highly correlates with p(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.

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Anahtar Kelimeler

Hadron-Hadron scattering (experiments), Relativistic heavy ion physics, Q(T)

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Künye

Journal Of Hıgh Energy Physıcs Issue 5 Article Number 182, 2021