Neutral pion production in Au+Au collisions at {radical}{ovr s}{sub NN} = 200 GeV.
The results of midrapidity (0 < y < 0.8) neutral pion spectra over an extended transverse momentum range (1 < p{sub T} < 12 GeV/c) in {radical}{ovr s}{sub NN} = 200 GeV Au+Au collisions, measured by the STAR experiment, are presented. The neutral pions are reconstructed from photons measured either by the STAR Barrel Electro-Magnetic Calorimeter or by the Time Projection Chamber via tracking of conversion electron-positron pairs. Our measurements are compared to previously published {pi}{sup {+-}} and {pi}{sup 0} results. The nuclear modification factors R{sub CP} and R{sub AA} of {pi}{sup 0} are also presented as a function of p{sub T}. In the most central Au+Au collisions, the binary collision scaled {pi}{sup 0} yield at high p{sub T} is suppressed by a factor of about 5 compared to the expectation from the yield of p+p collisions. Such a large suppression is in agreement with previous observations for light quark mesons and is consistent with the scenario that partons suffer considerable energy loss in the dense medium formed in central nucleus-nucleus collisions at the Relativistic Heavy Ion Collider.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; NSF; Sloan Foundation; EPSRC United Kingdom
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 988140
- Report Number(s):
- ANL-HEP-PR-10-28
- Journal Information:
- Phys. Rev. C, Journal Name: Phys. Rev. C Journal Issue: Oct. 2009 Vol. 80; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Neutral Pion Production in Au+Au Collisions at sqrt sNN = 200 GeV
Detailed study of high-p{sub T} neutral pion suppression and azimuthal anisotropy in Au+Au collisions at {radical}(s{sub NN})=200 GeV