Abstract (data abstract)

We report on the yield of protons and anti-protons, as a function of centrality and transverse momentum, in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV measured at mid-rapidity by the PHENIX experiment at RHIC. In central collisions at intermediate transverse momenta (1.5 < $p_T$ < 4.5 GeV/$c$) a significant fraction of all produced particles are protons and anti-protons. They show a centrality-scaling behavior different from that of pions. The $\bar{p}$/$\pi$ and $p$/$\pi$ ratios are enhanced compared to peripheral Au+Au, $p$+$p$, and $e^+$$e^-$ collisions. This enhancement is limited to $p_T$ < 5 GeV/$c$ as deduced from the ratio of charged hadrons to $\pi^0$ measured in the range 1.5 < $p_T$ < 9 GeV/c.

Figure 1a

Data from Fig. 1 of PRL 91, 172301 (2003)

10.17182/hepdata.143073.v1/t1

$p$/$\pi^+$ and $p$/$\pi^-$ ratios for central (0-10%) mid-central (20-30%) and peripheral (60-92%) Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV.
Figure 1b

Data from Fig. 1 of PRL 91, 172301 (2003)

10.17182/hepdata.143073.v1/t2

$p$/$\pi^-$ and $p$/$\pi^0$ ratios for central (0-10%) mid-central (20-30%) and peripheral (60-92%) Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV.
Figure 2

Data from Fig. 2 of PRL 91, 172301 (2003)

10.17182/hepdata.143073.v1/t3

$p$ and $\bar{p}$ invariant yields scaled by $N_{coll}$. Error bars are statistical. Systematic errors on $N_{coll}$ range from ~ 10%...
Figure 3a

Data from Fig. 3 of PRL 91, 172301 (2003)

10.17182/hepdata.143073.v1/t4

Nucelar modification factor $R_{CP}$ for ($p+\bar{p}$)/2.
Figure 3b

Data from Fig. 3 of PRL 91, 172301 (2003)

10.17182/hepdata.143073.v1/t5

Nucelar modification factor $R_{CP}$ for $\pi^0$.
Figure 4a

Data from Fig. 4 of PRL 91, 172301 (2003)

10.17182/hepdata.143073.v1/t6

Charged hadron to $\pi^0$ ratio in central (0-10%) Au+Au collisions.
Figure 4b

Data from Fig. 4 of PRL 91, 172301 (2003)

10.17182/hepdata.143073.v1/t7

Charged hadron to $\pi^0$ ratio in peripheral (60-92%) Au+Au collisions. The peripheral data points are offset by +130 MeV/$c$ for...
Figure 4c

Data from Fig. 4 of PRL 91, 172301 (2003)

10.17182/hepdata.143073.v1/t8

Systematic error on normalization a) common to both centralities b) that can move the $h$/$\pi^0$ ratios for each centrality independent...

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