Letter to the Editor : Transverse-momentum {rho}{ sub t} correlations on ({eta},{phi}) from mean-{rho}{sub t}) fluctuations in Au-Au collisions at {radical}{ovr s}{sub NN} = 200 GeV.
We present first measurements of the pseudorapidity and azimuth ({eta}, {phi}) bin-size dependence of event-wise mean transverse-momentum <p{sub T}> fluctuations for Au-Au collisions at {radical}s{sub NN} = 200 GeV. We invert that dependence to obtain p{sub t} autocorrelations on differences ({eta}{sub {Delta}}, {phi}{sub {Delta}}) interpreted to represent velocity/temperature distributions on ({eta}, {phi}). The general form of the autocorrelations suggests that the basic correlation mechanism is parton fragmentation. The autocorrelations vary rapidly with collision centrality, which suggests that fragmentation is strongly modified by a dissipative medium in the more central Au-Au collisions relative to peripheral or p-p collisions.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF); Swiss NSF
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 966037
- Report Number(s):
- ANL-HEP-PR-09-68; JPGPED; TRN: US0903995
- Journal Information:
- J. Phys. G, Vol. 32, Issue 2006; ISSN 0954-3899
- Country of Publication:
- United States
- Language:
- ENGLISH
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