Identified hadron compositions in p+p and Au+Au collisions at high transverse momenta at $\sqrt{s_{_{NN}}} = 200$ GeV

The collaboration
Phys.Rev.Lett. 108 (2012) 072302, 2012.

Abstract (data abstract)
BNL-RHIC. We report transverse momentum ($p_T \leq 15$ GeV/c) spectra of $\pi^{\pm}$, $K^{\pm}$ and $p$, $\bar{p}$, $K^0_S$, and $\rho^0$ at mid-rapidity in p+p and Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV. Perturbative QCD calculations are consistent with $\pi^{\pm}$ spectra in p+p collisions but do not reproduce $K$ and $p$($\bar{p}$) spectra. The observed decreasing antiparticle-to-particle ratios with increasing $p_T$ provide experimental evidence for varying quark and gluon jet contributions to high-$p_T$ hadron yields. The relative hadron abundances in Au+Au at $p_T > 8$ GeV/c are measured to be similar to the p+p results, despite the expected Casimir effect for parton energy loss.

• #### Figure 1.1: Invariant yield vs $p_T$ in p+p collisions.

Data from Figure 1

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• #### Figure3.2: RAA vs $p_T$ in 0-12% Au+Au collisions.

Data from Figure 3 (a)

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$R_{AA}$ of $K^{\pm}+p(\bar{p})$ in central Au+Au collisions as a function of $p_T$. Bars and boxes (bands) represent statistical and systematic...

• #### Figure3.3: RAA vs $p_T$ in 0-12% Au+Au collisions.

Data from Figure 3 (a)

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$R_{AA}$ of $K^0_S$ in central Au+Au collisions as a function of $p_T$. The curves are the calculations for $K^0_S$ $R_{AA}$...

• #### Figure3.4: RAA vs $p_T$ in 0-12% Au+Au collisions.

Data from Figure 3 (a)

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$R_{AA}$ of $\rho^0$ in central Au+Au collisions as a function of $p_T$. Bars and boxes (bands) represent statistical and systematic...

• #### Figure3.5: Double ratio vs $p_T$ in 0-12% Au+Au collisions.

Data from Figure 3 (b)

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The ratios of $R_{AA}[K^{\pm} + p(\bar{p})]$ to $R_{AA}(\pi^{\pm})$. The boxes and shaded bands represent the systematic uncertainties for $R_{AA}[K^{\pm} +p(\bar{p})]/R_{AA}(\pi^{\pm})$,...

• #### Figure3.6: Double ratio vs $p_T$ in 0-12% Au+Au collisions.

Data from Figure 3 (b)

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The ratios of $R_{AA}(K^− + \bar{p})$ to $R_{AA}(K^+ p)$. The systematic uncertainties for $R_{AA}(K^− + \bar{p})/R_{AA}(K^+ +p)$ are 2–12% and...

• #### Figure3.7: Double ratio vs $p_T$ in 0-12% Au+Au collisions.

Data from Figure 3 (b)

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The ratios of $R_{AA}[\rho^0]$ to $R_{AA}(\pi^{\pm})$. The boxes and shaded bands represent the systematic uncertainties for $R_{AA}(\rho^0)/R_{AA}(\pi^{\pm})$, respectively.