Nuclear effects on hadron production in d+Au collisions at sNN=200 GeV revealed by comparison with p+p data

Le résumé fourni par la source

PHENIX has measured the centrality dependence of midrapidity pion, kaon, and proton transverse momentum distributions in $d+\mathrm{Au}$ and $p+p$ collisions at $\sqrt{{s}_{{}_{\mathit{NN}}}}=200$ GeV. The $p+p$ data provide a reference for nuclear effects in $d+\mathrm{Au}$ and previously measured $\mathrm{Au}+\mathrm{Au}$ collisions. Hadron production is enhanced in $d+\mathrm{Au}$, relative to independent nucleon-nucleon scattering, as was observed in lower energy collisions. The nuclear modification factor for (anti)protons is larger than that for pions. The difference increases with centrality but is not sufficient to account for the abundance of baryon production observed in central $\mathrm{Au}+\mathrm{Au}$ collisions at the BNL Relativistic Heavy Ion Collider (RHIC). The centrality dependence in $d+\mathrm{Au}$ shows that the nuclear modification factor increases gradually with the number of collisions encountered by each participant nucleon. We also present comparisons with lower energy data as well as with parton recombination and other theoretical models of nuclear effects on particle production.

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