Back-to-back pair suppression at large transverse momentum in Au + Au collisions at PHENIX

✍ Scribed by Michael P. McCumber

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 236 KB
• Volume: 855
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2011.02.092

✦ Synopsis

Suppression of jet fragments due to parton energy loss is a well known phenomena from high p T measurements of single particles (R AA ) and back-to-back pairs (I AA ) in central and mid-central heavy ion collisions. However the nature of the parton-medium interaction is still not well-understood and an outstanding issue to be fully resolved is the characterization of the path-length dependence of energy loss. A recent study of pair correlations between large transverse momentum neutral pion triggers (p T = 4-7 GeV/c) and charged hadron partners (p T = 3-7 GeV/c) in midcentral (20-60%) Au+Au collisions as a function of trigger orientation with respect to the reaction plane is discussed. The dependence found in the suppression of (di-)jet pairs is qualitatively consistent with a picture of little near-side parton energy loss either due to surface bias or fluctuations and increased away-side parton energy loss due to a long path through the medium.