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

Collaboration
Jun 21, 2019
9 pages
Published in:
  • Chin.Phys.C 44 (2020) 104001
e-Print:
DOI:
Experiments:

Citations per year

20212022202310
Abstract: (arXiv)
High transverse momentum (pTp_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 pTp_T 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 sNN=200\sqrt{s_{_\mathrm{NN}}}=200 GeV with the STAR experiment. The correlation shapes, for trigger particle pT>3p_T>3 GeV/cc and various associated particle pTp_T ranges within 0.5<pT<100.5<p_T<10 GeV/cc, 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.
Note:
  • 9 pages, 5 figures
  • jet: broadening
  • transverse momentum: high
  • background: anisotropy
  • heavy ion: scattering
  • correlation
  • suppression
  • energy loss
  • trigger
  • parton
  • STAR