Campus Units

Physics and Astronomy

Document Type

Article

Publication Version

Published Version

Publication Date

6-25-2010

Journal or Book Title

Physical Review Letters

Volume

104

Issue

25

First Page

252301

DOI

10.1103/PhysRevLett.104.252301

Abstract

Hard-scattered parton probes produced in collisions of large nuclei indicate large partonic energy loss, possibly with collective produced-medium response to the lost energy. We present measurements of pi(0) trigger particles at transverse momenta p(T)(t) = 4-12 GeV/c and associated charged hadrons (p(T)(a) = 0.5-7 GeV/c) vs relative azimuthal angle Delta phi in Au + Au and p + p collisions at root s(NN) = 200 GeV. The Au + Au distribution at low p(T)(a), whose shape has been interpreted as a medium effect, is modified for p(T)(t) < 7 GeV/c. At higher p(T)(t), the data are consistent with unmodified or very weakly modified shapes, even for the lowest measured p(T)(a), which quantitatively challenges some medium response models. The associated yield of hadrons opposing the trigger particle in Au + Au relative to p + p (I-AA) is suppressed at high p(T) (I-AA approximate to 0.35-0.5), but less than for inclusive suppression (R-AA approximate to 0.2).

Comments

This article is published as Adare, A., S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, H. Al-Bataineh, J. Alexander et al. "Transition in yield and azimuthal shape modification in dihadron correlations in relativistic heavy ion collisions." Physical review letters 104, no. 25 (2010): 252301. DOI:10.1103/PhysRevLett.104.252301. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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