Collinear factorized perturbative quantum chromodynamics (pQCD) model predictions are compared for $p+{ \rm Pb}$ 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), $R_{ p{ \rm Pb}}(y=0,p_T<20\;{ \rm GeV}/{ \it c}) = dn_{ p{ \rm Pb}} /(N_{ \rm coll}(b)dn_{ pp})$ and the pseudorapidity asymmetry $Y_{ asym}^{ h}(p_T)=R^h_{ pPb}(p_T, \eta<0)/R^h_{ pPb}(p_T,\eta>0)$ are computed using { \small HIJING/B\=B 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).
Categories: nucl-th hep-ph nucl-ex