Photon-Hadron Jet Correlations in p+p and Au+Au Collisions at s**(1/2) = 200-GeV

The PHENIX collaboration
Phys.Rev.C 80 (2009) 024908, 2009.

Abstract (data abstract)
BNL-RHIC. We report the observation at the Relativistic Heavy Ion Collider (RHIC) of suppression of back-to-back correlations in the direct photon+jet channel in Au+Aurelative top+pcollisions. Two-particlecorrelations of direct photon triggers with associated hadrons are obtained by statistical subtractionof the decay photon-hadron (γ-h) background. The initial momentum of the away-side parton istightly constrained, because the parton-photon pair exactly balance in momentum at leading orderin perturbative quantum chromodynamics (pQCD), making such correlations a powerful probe ofthe in-medium parton energy loss. The away-side nuclear suppression factor,IAA, in central Au+Aucollisions, is 0.32±0.12stat±0.09systfor hadrons of 3< phT<5 in coincidence with photons of 5< pγT<15 GeV/c. The suppression is comparable to that observed forhigh-pTsingle hadronsand dihadrons. The direct photon associated yields inp+pcollisions scale approximately with themomentum balance,zT≡phT/pγT, as expected for a measure of the away-side parton fragmentationfunction. We compare to Au+Au collisions for which the momentum balance dependence of thenuclear modification should be sensitive to the path-lengthdependence of parton energy loss.

  • Head Region Yields 0-20% Centrality 5-7

    10.17182/hepdata.95790.v1/t1

    direct $\gamma$-hadron yields per trigger p+p and Au+Au at 5<$p_{T}^{\gamma}$<7 GeV/c.

  • Head Region Yields 0-20% Centrality 7-9

    10.17182/hepdata.95790.v1/t2

    direct $\gamma$-hadron yields per trigger p+p and Au+Au at 7<$p_{T}^{\gamma}$<9 GeV/c.

  • Head Region Yields 0-20% Centrality 9-12

    10.17182/hepdata.95790.v1/t3

    direct $\gamma$-hadron yields per trigger p+p and Au+Au at 9<$p_{T}^{\gamma}$<12 GeV/c.

  • Head Region Yields 0-20% Centrality 12-15

    10.17182/hepdata.95790.v1/t4

    direct $\gamma$-hadron yields per trigger p+p and Au+Au at 12<$p_{T}^{\gamma}$<15 GeV/c.

  • Head Region Yields 20-40% Centrality 5-7

    10.17182/hepdata.95790.v1/t5

    direct $\gamma$-hadron yields per trigger p+p and Au+Au at 5<$p_{T}^{\gamma}$<7 GeV/c.

  • Head Region Yields 20-40% Centrality 7-9

    10.17182/hepdata.95790.v1/t6

    direct $\gamma$-hadron yields per trigger p+p and Au+Au at 7<$p_{T}^{\gamma}$<9 GeV/c.

  • Head Region Yields 20-40% Centrality 9-12

    10.17182/hepdata.95790.v1/t7

    direct $\gamma$-hadron yields per trigger p+p and Au+Au at 9<$p_{T}^{\gamma}$<12 GeV/c.

  • Head Region Yields 20-40% Centrality 12-15

    10.17182/hepdata.95790.v1/t8

    direct $\gamma$-hadron yields per trigger p+p and Au+Au at 12<$p_{T}^{\gamma}$<15 GeV/c.

  • Head Region Yields 40-60% Centrality 5-7

    10.17182/hepdata.95790.v1/t9

    direct $\gamma$-hadron yields per trigger p+p and Au+Au at 5<$p_{T}^{\gamma}$<7 GeV/c.

  • Head Region Yields 40-60% Centrality 7-9

    10.17182/hepdata.95790.v1/t10

    direct $\gamma$-hadron yields per trigger p+p and Au+Au at 7<$p_{T}^{\gamma}$<9 GeV/c.

  • Head Region Yields 40-60% Centrality 9-12

    10.17182/hepdata.95790.v1/t11

    direct $\gamma$-hadron yields per trigger p+p and Au+Au at 9<$p_{T}^{\gamma}$<12 GeV/c.

  • Head Region Yields 40-60% Centrality 12-15

    10.17182/hepdata.95790.v1/t12

    direct $\gamma$-hadron yields per trigger p+p and Au+Au at 12<$p_{T}^{\gamma}$<15 GeV/c.

  • $I_{AA}$ Ratio fig5a

    10.17182/hepdata.95790.v1/t13

    Ratio of $I_{AA}$ of Au+Au to p+p yields at 5<$p_{T}^{\gamma}$<7 GeV/c.

  • $I_{AA}$ Ratio fig5b

    10.17182/hepdata.95790.v1/t14

    Ratio of $I_{AA}$ of Au+Au to p+p yields at 7<$p_{T}^{\gamma}$<9 GeV/c.

  • $I_{AA}$ Ratio fig5c

    10.17182/hepdata.95790.v1/t15

    Ratio of $I_{AA}$ of Au+Au to p+p yields at 9<$p_{T}^{\gamma}$<12 GeV/c.

  • $I_{AA}$ Ratio fig5d

    10.17182/hepdata.95790.v1/t16

    Ratio of $I_{AA}$ of Au+Au to p+p yields at 12<$p_{T}^{\gamma}$<15 GeV/c.

  • $I_{AA}(Z_T)$ Ratio fig8a

    10.17182/hepdata.95790.v1/t17

    $I_{AA}(Z_T)$ for the 20% most central Au+Au data at 5<$p_{T}^{\gamma}$<7 GeV/c compared to predictions from an energy loss calculation.

  • $I_{AA}(Z_T)$ Ratio fig8b

    10.17182/hepdata.95790.v1/t18

    $I_{AA}(Z_T)$ for the 20% most central Au+Au data at 7<$p_{T}^{\gamma}$<9 GeV/c compared to predictions from an energy loss calculation.

  • $I_{AA}(Z_T)$ Ratio fig8c

    10.17182/hepdata.95790.v1/t19

    $I_{AA}(Z_T)$ for the 20% most central Au+Au data at 9<$p_{T}^{\gamma}$<12 GeV/c compared to predictions from an energy loss calculation.

  • $I_{AA}(Z_T)$ Ratio fig8d

    10.17182/hepdata.95790.v1/t20

    $I_{AA}(Z_T)$ for the 20% most central Au+Au data at 12<$p_{T}^{\gamma}$<15 GeV/c compared to predictions from an energy loss calculation.

  • p+p Head Region Yields 5-7

    10.17182/hepdata.95790.v1/t21

    direct $\gamma$-hadron yields per trigger p+p at 5<$p_{T}^{\gamma}$<7 GeV/c.

  • p+p Head Region Yields 7-9

    10.17182/hepdata.95790.v1/t22

    direct $\gamma$-hadron yields per trigger p+p at 7<$p_{T}^{\gamma}$<9 GeV/c.

  • p+p Head Region Yields 9-12

    10.17182/hepdata.95790.v1/t23

    direct $\gamma$-hadron yields per trigger p+p at 9<$p_{T}^{\gamma}$<12 GeV/c.

  • p+p Head Region Yields 12-15

    10.17182/hepdata.95790.v1/t24

    direct $\gamma$-hadron yields per trigger p+p at 12<$p_{T}^{\gamma}$<15 GeV/c.

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