QCD analysis of CMS W+ charm measurements at LHC with s1/2=7 TeV and implications for strange PDF

We calculate cross-sections and cross-section ratios of a charm quark production in association with a W gauge boson at next-to-leading order QCD using MadGraph and CT10NNLO,CT14NNLO,and MSTW2008NNLO PDFs.We compare the results with measurements from the CMS detector at the LHC at a center-of-mass energy of 7 TeV.Moreover,we calculate absolute and normalized differential cross-sections as well as differential cross-section ratios as a function of the lepton pseudorapidity from the W boson decay.The correlation between the CT14NNLO PDFs and predictions for W+charm data are studied as well.Furthermore,by employing the error PDF updating method proposed by the CTEQ-TEA group,we update CT14NNLO PDFs,and analyze the impact of CMS 7 TeV W+charm production data to the original CT14NNLO PDFs.By comparison of the g(x,Q),s(x,Q),u(x,Q),d(x,Q),u^-(x,Q),and d^-(x,Q)PDFs at Q=1.3 GeV and Q=100 GeV for the CT14NNLO and CT14NNLO+Wc,we see that the error band of the s(x,Q)PDF is reduced in the region x<0.4,and the error band of g(x,Q)PDF is also slightly reduced at region 0.01<x<0.1.

We calculate cross-sections and cross-section ratios of a charm quark production in association with a W gauge boson at next-to-leading order QCD using MadGraph and CTIONNLO,CT14 NNLO,and MSTW2008 NNLO PDFs.We compare the results with measurements from the CMS detector at the LHC at a center-of-mass energy of 7 TeV.Moreover,we calculate absolute and normalized differential cross-sections as well as differential cross-section ratios as a function of the lepton pseudorapidity from the W boson decay.The correlation between the CT14 NNLO PDFs and Predictions for W+charm data are studied as well.Furthermore,by employing the error PDF updating method proposed by the CTEQ-TEA group,we update CT14 NNLO PDFs,and analyze the impact of CMS 7 TeV W+charm production data to the original CT14 NNLO PDFs.By comparison of the g(x,Q),s(x,Q),u(x,Q),d(x,Q),u(x,Q),and d(x,Q) PDFs at Q=1.3 GeV and Q=100 GeV for the CT14 NNLO and CT14 NNLO+Wc,we see that the error band of the s(x,Q) PDF is reduced in the region x <0.4,and the error band of g(x,Q) PDF is also slightly reduced at region 0.01 <x <0.1.