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Dissipation and fragmentation of low-Q 2 scattered partons in Au−Au collisions at RHIC

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Acta Physica Hungarica Series A, Heavy Ion Physics

Abstract

Two-particle correlations and event-wise fluctuations in transverse momentum p tare reported for Au−Au collisions at √s NN =62 and 200 GeV on pseudorapidity η and azimuth ϕ. Distributions of all pairs of particles (no leading trigger particle) reveal jet-like correlations, or peaks at pair-wise opening angles of order 1 radian or less. The width of this same-side correlation peak increases dramatically on pseudorapidity and decreases on azimuth for increasing collision centrality. Evolution of the same-side peak with centrality suggests dissipation of low-Q 2 partons via strong couplign to an expanding bulk medium. p t correlations, which provide access to temperature and/or velocity distributions in the colliding system, are also presented.

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Authors and Affiliations

  1. Department of Physics, The University of Texas at Austin, 78712, Austin, Texas, USA

    R. L. Ray & M. Daugherity

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  1. R. L. Ray
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  2. M. Daugherity
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the STAR Collaboration

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Correspondence to R. L. Ray.

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Ray, R.L., Daugherity, M. & the STAR Collaboration. Dissipation and fragmentation of low-Q 2 scattered partons in Au−Au collisions at RHIC. Acta Phys. Hung. A 27, 259–262 (2006). https://doi.org/10.1556/APH.27.2006.2-3.18

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  • DOI: https://doi.org/10.1556/APH.27.2006.2-3.18

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