  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).
