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Measurement of away-side broadening with self-subtraction of flow in Au+Au collisions at $\sqrt{s_{_\mathrm{NN}}}=200$ GeV

The STAR collaboration
Chin.Phys.C 44 (2020) 104001, 2020.

Abstract
High transverse momentum ($p_T$) particle production is suppressed due to parton (jet) energy loss in the hot dense medium created in relativistic heavy-ion collisions. Redistribution of energy at low-to-modest $p_T$ has been elusive to measure because of large anisotropic backgrounds. We report a novel data-driven method for background evaluation and subtraction, exploiting the away-side pseudorapidity gaps, to measure the jetlike correlation shape in Au+Au collisions at $\sqrt{s_{_\mathrm{NN}}}=200$ GeV with the STAR experiment. The correlation shapes, for trigger particle $p_T>3$ GeV/$c$ and various associated particle $p_T$ ranges within $0.5<p_T<10$ GeV/$c$, are consistent with Gaussians and their widths are found to increase with centrality. The results indicate jet broadening in the medium created in central heavy-ion collisions.

  • Fig 2a

    10.17182/hepdata.95119.v1/t1

    Distributions of the recoil momentum within 0.5<\eta<1 (Px|_{0.5}^{1}) from high-pT trigger particles of 3<pT_Trig<10 GeV/c in 50-80% peripheral collisions

  • Fig 2b

    10.17182/hepdata.95119.v1/t2

    Distributions of the recoil momentum within 0.5<\eta<1 (Px|_{0.5}^{1}) from high-pT trigger particles of 3<pT_Trig<10 GeV/c in 0-10% central collisions

  • Fig 3a

    10.17182/hepdata.95119.v1/t3

    Dihadron azimuthal correlations in close-region and far-region for 3<pT_Trig<10 GeV/c and 1<pT_Assoc<2 GeV/c in 10-30% Au+Au collisions at \sNN=200 GeV

  • Fig 3b

    10.17182/hepdata.95119.v1/t4

    The difference between close-region correlation and scaled far-region correlation

  • Fig 4

    10.17182/hepdata.95119.v1/t5

    Gaussian fit width to away-side jetlike correlations as a function of pT_Assoc and centrality in Au+Au collisions at \sNN=200 GeV

  • Fig 5a

    10.17182/hepdata.95119.v1/t6

    Away-side jetlike correlation width as a function of pT_Assoc for 3<pT_Trig<10 GeV/c in 50-80% peripheral and top 10% central Au+Au...

  • Fig 5b

    10.17182/hepdata.95119.v1/t7

    The difference between the correlation widths in central and peripheral collisions

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