Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.142301
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Funding
- Office of Nuclear Physics in DOE Office of Science
- NSF (USA)
- MEXT
- JSPS (Japan)
- CNPq
- FAPESP (Brazil)
- NSFC (China)
- MSMT (Czech Republic)
- IN2P3/CNRS
- CEA (France)
- BMBF
- DAAD
- AvH (Germany)
- OTKA (Hungary)
- DAE
- DST (India)
- ISF (Israel)
- NRF
- WCU (Korea)
- MES
- RAS
- FAAE (Russia)
- Grants-in-Aid for Scientific Research [20224014] Funding Source: KAKEN
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We have measured the azimuthal anisotropy of pi(0) production for 1 < p(T) < 18 GeV/c for Au + Au collisions at root s(NN) = 200 GeV. The observed anisotropy shows a gradual decrease for 3 less than or similar to p(T) less than or similar to 7-10 GeV/c, but remains positive beyond 10 GeV/c. The magnitude of this anisotropy is underpredicted, up to at least similar to 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.
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