Measurement of away-side broadening with self-subtraction of flow in Au+Au collisions at GeV
arXiv:1906.09363 · doi:10.1088/1674-1137/ab97a9
Abstract
High transverse momentum () 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 has been elusive to measure because of large anisotropic backgrounds. We report a 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 GeV with the STAR experiment. The correlation shapes, for trigger particle GeV/ and various associated particle ranges within GeV/, 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.
9 pages, 5 figures
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