Azimuthal Anisotropy of π0 Production in Au+Au Collisions at √sNN=200 GeV: Path-Length Dependence of Jet Quenching and the Role of Initial Geometry
We have measured the azimuthal anisotropy of {pi}{sup 0} production for 1 < p{sub T} < 18 GeV/c for Au+Au collisions at {radical} s{sub NN} = 200 GeV. The observed anisotropy shows a gradual decrease for 3 {approx}< p{sub T} {approx}< 7-10 GeV/c, but remains positive beyond 10 GeV/c. The magnitude of this anisotropy is underpredicted, up to at least {approx}10 GeV/c, by current perturbative QCD (PQCD) energy-loss model calculations. An estimate of the increase in anisotropy expected from initial-geometry modification due to gluon saturation effects and fluctuations is insufficient to account for this discrepancy. Calculations that implement a path-length dependence steeper than what is implied by current PQCD energy-loss models show reasonable agreement with the data.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC)
- Sponsoring Organization:
- DOE - Office Of Science
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 993053
- Report Number(s):
- BNL-94148-2010-JA; PRLTAO; R&D Project: PO 003; KB0201021; TRN: US1007961
- Journal Information:
- Physical Review Letters, Vol. 105, Issue 14; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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