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

The STAR 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

    10.17182/hepdata.95749.v1/t1

    The invariant yields $d^2N/(2\pi p_T dp_T dy)$ of $\pi^{\pm}$, $K^{\pm}$, $p$, and $\bar{p}$ from non-singly diffractive p+p collisions ($\sigma_{NSD} =...

  • Figure 1.2: Invariant yield vs $p_T$ in p+p collisions.

    Data from Figure 1

    10.17182/hepdata.95749.v1/t2

    The invariant yields $d^2N/(2\pi p_T dp_T dy)$ of $K^0_S$ from non-singly diffractive p+p collisions ($\sigma_{NSD} = 30.0 \pm 3.5$ mb),...

  • Figure 1.3: Invariant yield vs $p_T$ in p+p collisions.

    Data from Figure 1

    10.17182/hepdata.95749.v1/t3

    The invariant yields $d^2N/(2\pi p_T dp_T dy)$ of $\rho^0$ from non-singly diffractive p+p collisions ($\sigma_{NSD} = 30.0 \pm 3.5$ mb),...

  • Figure 1.4: Invariant yield vs $p_T$ in Au+Au (0-12%) collisions

    Data from Figure 1

    10.17182/hepdata.95749.v1/t4

    The invariant yields $d^2N/(2\pi p_T dp_T dy)$ of $K + p(\bar{p})$ in central Au+Au collisions, and NLO calculations with AKK...

  • Figure 1.5: Invariant yield vs $p_T$ in Au+Au (0-12%) collisions

    Data from Figure 1

    10.17182/hepdata.95749.v1/t5

    The invariant yields $d^2N/(2\pi p_T dp_T dy)$ of $\rho^0$ in central Au+Au collisions, and NLO calculations with AKK [9] and...

  • Figure 1.6: Invariant yield vs $p_T$ in Au+Au (0-12%) collisions

    Data from Figure 1

    10.17182/hepdata.95749.v1/t6

    The invariant yields $d^2N/(2\pi p_T dp_T dy)$ of $K^0_S$ in central Au+Au collisions, and NLO calculations with AKK [9] and...

  • Figure 2.1: Particle ratios vs $p_T$ in p+p collisions.

    Data from Figure 2 (a)-(f)

    10.17182/hepdata.95749.v1/t7

    Yield ratios $\pi^−/\pi^+$, $\bar{p}/p$, $K^−/K^+$, $p/\pi^+$, $\bar{p}/\pi^−$, and $K^{\pm}/\pi^{\pm}$ versus $p_T$ in p+p collisions, and nominal NLO calculations with AKK...

  • Figure 2.2: Particle ratios vs $p_T$ in p+p collisions.

    Data from Figure 2 (f)

    10.17182/hepdata.95749.v1/t8

    Yield ratio $K^0_S$)/$\pi^{\pm}$ versus $p_T$ in p+p collisions, and nominal NLO calculations with AKK [9] and DSS [10] FFs without...

  • Figure 2.3: Particle ratios vs $p_T$ in Au+Au collisions.

    Data from Figure 2 (d) and (e)

    10.17182/hepdata.95749.v1/t9

    Yield ratios $p/\pi^+$ and $\bar{p}/\pi^−$ versus $p_T$ in central Au+Au collisions [14] with updated uncertainties at high $p_T$. Bars and...

  • Figure3.1: RAA vs $p_T$ in 0-12% Au+Au collisions.

    Data from Figure 3 (a)

    10.17182/hepdata.95749.v1/t10

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

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

    Data from Figure 3 (a)

    10.17182/hepdata.95749.v1/t11

    $R_{AA}$ 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)

    10.17182/hepdata.95749.v1/t12

    $R_{AA}$ 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)

    10.17182/hepdata.95749.v1/t13

    $R_{AA}$ 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)

    10.17182/hepdata.95749.v1/t14

    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)

    10.17182/hepdata.95749.v1/t15

    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)

    10.17182/hepdata.95749.v1/t16

    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.

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