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Rapidity and species dependence of particle production at large transverse momentum for d+Au collisions at s(NN)**(1/2) = 200-GeV

The collaboration
Phys.Rev.C 76 (2007) 054903, 2007.

Abstract (data abstract)
We determine rapidity asymmetry in the production of charged pions, protons, and antiprotons for large transverse momentum ($p_{T}$) for $d+Au$ collisions at $\sqrt{s_{NN}}=200$ GeV. The rapidity asymmetry is defined as the ratio of particle yields at backward rapidity ($Au$ beam direction) to those at forward rapidity ($d$ beam direction). The identified hadrons are measured in the rapidity regions $|y| < 0.5$ and $0.5 < |y| < 1.0$ for the $p_{T}$ range $2.5 < p_{T} < 10$ GeV/c. We observe significant rapidity asymmetry for charged pion and proton + antiproton production in both the rapidity regions. The asymmetry is larger for $0.5 < |y| < 1.0$ than for $|y| < 0.5$ and is almost independent of particle type. The measurements are compared to various model predictions employing multiple scattering, energy loss, nuclear shadowing, saturation effects, and recombination and also to a phenomenological parton model. We find that asymmetries are sensitive to model parameters and show model preference. The rapidity dependence of $\pi^{-} / \pi^{+}$ and $\bar{p} / p$ ratios in peripheral $d+Au$ and forward neutron-tagged events are used to study the contributions of valence quarks and gluons to particle production at high $p_{T}$.

• #### Table 1a

Data from Fig. 3a, $\pi^{+}$, $|y| < 0.5$

10.17182/hepdata.101349.v1/t1

High transverse-momentum spectra ($p_{T} > 2.5$ GeV/c) of charged pions, protons, and antiprotons for the rapidity regions $|y| < 0.5$...

• #### Table 1b

Data from Fig. 3a, $\pi^{+}$, $0.5 < |y| < 1.0$

10.17182/hepdata.101349.v1/t2

High transverse-momentum spectra ($p_{T} > 2.5$ GeV/c) of charged pions, protons, and antiprotons for the rapidity regions $|y| < 0.5$...

• #### Table 1c

Data from Fig. 3b, $\pi^{-}$, $|y| < 0.5$

10.17182/hepdata.101349.v1/t3

High transverse-momentum spectra ($p_{T} > 2.5$ GeV/c) of charged pions, protons, and antiprotons for the rapidity regions $|y| < 0.5$...

• #### Table 1d

Data from Fig. 3b, $\pi^{-}$, $0.5 < |y| < 1.0$

10.17182/hepdata.101349.v1/t4

High transverse-momentum spectra ($p_{T} > 2.5$ GeV/c) of charged pions, protons, and antiprotons for the rapidity regions $|y| < 0.5$...

• #### Table 1e

Data from Fig. 3c, $p$, $|y| < 0.5$

10.17182/hepdata.101349.v1/t5

High transverse-momentum spectra ($p_{T} > 2.5$ GeV/c) of charged pions, protons, and antiprotons for the rapidity regions $|y| < 0.5$...

• #### Table 1f

Data from Fig. 3c, $p$, $0.5 < |y| < 1.0$

10.17182/hepdata.101349.v1/t6

High transverse-momentum spectra ($p_{T} > 2.5$ GeV/c) of charged pions, protons, and antiprotons for the rapidity regions $|y| < 0.5$...

• #### Table 1g

Data from Fig. 3d, $\bar{p}$, $|y| < 0.5$

10.17182/hepdata.101349.v1/t7

High transverse-momentum spectra ($p_{T} > 2.5$ GeV/c) of charged pions, protons, and antiprotons for the rapidity regions $|y| < 0.5$...

• #### Table 1h

Data from Fig. 3d, $\bar{p}$, $0.5 < |y| < 1.0$

10.17182/hepdata.101349.v1/t8

High transverse-momentum spectra ($p_{T} > 2.5$ GeV/c) of charged pions, protons, and antiprotons for the rapidity regions $|y| < 0.5$...

• #### Table 2

Data from Fig. 4

10.17182/hepdata.101349.v1/t9

High transverse-momentum rapidity asymmetry factor ($Y_{\scriptsize{\mbox{Asym}}}$) for $\pi^{+}+\pi^{-}$ and $p+\bar{p}$ for $|y| < 0.5$ and $0.5 < |y| < 1.0$...

• #### Table 3a

Data from Fig. 5, left panels

10.17182/hepdata.101349.v1/t10

Centrality dependence of high transverse-momentum rapidity asymmetry factor ($Y_{\scriptsize{\mbox{Asym}}}$) for $\pi^{+}+\pi^{-}$ and $p+\bar{p}$ for $|y| < 0.5$ (left panels) and...

• #### Table 3b

Data from Fig. 5, right panels

10.17182/hepdata.101349.v1/t11

Centrality dependence of high transverse-momentum rapidity asymmetry factor ($Y_{\scriptsize{\mbox{Asym}}}$) for $\pi^{+}+\pi^{-}$ and $p+\bar{p}$ for $|y| < 0.5$ (left panels) and...

• #### Table 4

Data from Fig. 11

10.17182/hepdata.101349.v1/t12

Variation of nuclear modification factor ($R_{CP}$) for $\pi^{+}+\pi^{-}$ and $p+\bar{p}$ with rapidity for $p_{T} > 2.5$ GeV/c for $d+Au$ collisions...

• #### Table 5

Data from Fig. 12, left panel

10.17182/hepdata.101349.v1/t13

Variation of $\pi^{-} / \pi^{+}$ and $\bar{p} / p$ with rapidity for $2.5 < p_{T} < 10$ GeV/c for peripheral...

• #### Table 6

Data from Fig. 12, right panel

10.17182/hepdata.101349.v1/t14

Variation of $\pi^{-} / \pi^{+}$ and $\bar{p} / p$ with rapidity for $2.5 < p_{T} < 10$ GeV/c for peripheral...

• #### Table 7

Data from Fig. 13

10.17182/hepdata.101349.v1/t15

Variation of double ratio $(\pi^{-} / \pi^{+})_{\scriptsize{\mbox{n-tag}}}/(\pi^{-} / \pi^{+})_{40-100\%}$ and $(\bar{p} / p)_{\scriptsize{\mbox{n-tag}}}/(\bar{p} / p)_{40-100\%}$ with rapidity for \$2.5 <...