Speaker
Description
Drell-Yan process is considered as one of the essential probes to understand the initial state of the nucleons presented as the parton distribution function (PDF) for stand-alone nucleon and nuclear PDF (nPDF) for confined nucleon in the nucleus. In LHC era, Z and W boson productions in pPb and PbPb collisions have been used to investigate the initial state effects. In this presentation, we report the results of the Drell-Yan process in pPb collisions at a center of mass energy of 8.16 TeV with the CMS detector. The differential cross sections are presented versus dimuon $p_\mathrm{T}$, rapidity and $\phi^{*}$ in a wider dimuon mass region that includes not only the Z boson mass range but also the lower mass region down to 15 GeV. In addition, the forward-backward asymmetries are shown in both mass regions, where the uncertainties are found to be smaller than in model calculations. The results in the Z mass region are the most precise to date, while the measurements in the lower mass region allow access to a new phase space for nPDF studies with lower longitudinal momentum fraction $x$ and lower energy scale $Q^{2}$. All results are compared to EPPS16, and nCTEQ15WZ nPDFs, and the free-proton PDF CT14, to better understand the nuclear PDF and the sensitivity of the models in pPb collisions.
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