Pseudorapidity asymmetry and centrality dependence of charged hadron spectra in d+Au collisions at sNN=200GeV

The pseudorapidity asymmetry and centrality dependence of charged hadron spectra in $d+\mathrm{Au}$ collisions at $\sqrt{s_{NN}}=200\mathrm{GeV}$ are presented. The charged particle density at midrapidity, its pseudorapidity asymmetry, and centrality dependence are reasonably reproduced by a multiphase transport model, by HIJING, and by the latest calculations in a saturation model. Ratios of transverse momentum spectra between backward and forward pseudorapidity are above unity for $p_T$ below $5\mathrm{GeV}∕c$. The ratio of central to peripheral spectra in $d+\mathrm{Au}$ collisions shows enhancement at $2<p_T<6\mathrm{GeV}∕c$, with a larger effect at backward rapidity than forward rapidity. Our measurements are in qualitative agreement with gluon saturation and in contrast to calculations based on incoherent multiple partonic scatterings.