| Parton distribution functions(PDFs)are very important ingredients for theoretical predictions at hadron colliders such as Large Hadron Collider(LHC)and Tevatron collider as well as other hadron scattering facilities like lepton-hadron Colliders.And it also plays significant role for both precision measurements and discovery of possible new physics beyond the SM.The PDFs are non-perturbative and therefore at present it can not be calculated from first principle at a low momentum transfer scale Q0.The general way to obtain PDFs is a global analysis of experimental data from various high energy scattering,like Deep Inelastic Scattering(DIS)at lepton-hadron colliders and protonproton collision at LHC as well as proton-antiproton collision at the Fermilab Tevatron.By now there are large number of new LHC data,with height precision,have been available and it is very important for constraining PDFs.It is clear that next step we need include those LHC measurements in CT fits.Currently,the common and complete method for obtaining more precise PDFs is to include new experimental data within the QCD global analysis package and redo the global fitting.It means that one should include the new data and old data which are already in the older PDFs,and do the full global analysis to obtain new best fit PDFs and corresponding error sets.However,redoing the QCD global analysis of PDFs is a very time consuming process.This consideration motivated us to explore different methods that overcome the difficulties mentioned above.In this paper,we analyze the impact of t-channel single top quark production cross section data on CT14nnlo PDFs by using error PDF Updating Method Package(ePump)because it can generate new PDFs,in a short time,and the new PDFs approximately equal to the PDFs which are generated from global analysis.For this,we calculate the total cross section(?(t),?(t),?(t+t)),cross section ratio ?(t)/?(t),differential cross section,and normalized differential cross section as a function of transverse momentum pT and rapidity y,at next-to-leading order QCD by MadGraph using CT14nnlo PDFs at center of mass energy 7,8 and 13TeV,respectively.We find that all the theoretical predictions good agreed with experimental data.And then we update CT14nnlo PDFs and observables by applying Error PDF Updating method.When weight factor equal to 6 we observe that,at Q=1.3GeV d-PDF and d-PDF's value have increased roughly about 2%at 10-5<x<5 × 10-3 range;At Q=1.3GeV,u-PDF and u-PDF's value have increased roughly about 0.5%at 10-4<x<5 × 10-3 range.u valence quak's PDF's values decreased roughly about 0.2%both at Q=1.3GeV and Q=100GeV.We also observe that the new PDFs' theory central value is closer to experimental data and theory uncertainties also decreased slightly than old one. |
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