Predictions for p+Pb at 5.02A TeV to test initial state nuclear shadowing at the Large Hadron Collider

Abstract

Collinear factorized perturbative quantum chromodynamics (pQCD) model predictions are compared for $p+\mathrm{Pb}$ at 5.02$A$ TeV to test nuclear shadowing of parton distribution at the Large Hadron Collider (LHC). The pseudorapidity distribution the nuclear modification factor (NMF), $R_{p\mathrm{Pb}}(y=0,p_T<20\mathrm{GeV}/c)=d{n}_{p\mathrm{Pb}}/(N_{\mathrm{coll}}(b)d{n}_{pp})$ and the pseudorapidity asymmetry $Y_{asym}^h(p_T)=R_{pPb}^h(p_T,\hat{I}\cdot <0)/R_{pPb}^h(p_T,\hat{I}\cdot >0)$ are computed using {\small HIJING/BB v2.0 model} and a pQCD improved parton model kTpQCD\_v2.0 which embedded generalized parton distribution functions (PDFs). These results are updated calculations of those presented in Phys. Rev. C {\bf 85}, 024903 (2012).

16 pages, 7 figures, contribution at 8th Workshop on "High p_T physics at the LHC", 20-24 October 2012, Wuhan, China version 2, 3 new figures added, typos corrected, new references