Neutral pion production in Au+Au collisions at √sNN=200 GeV

Abelev, B. I.
Planinić, Mirko
Poljak, Nikola
Zuo, J. X.

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Publication date

January 2009

DOI

10.1103/PhysRevC.80.044905

Publisher

American Physical Society (APS)

Abstract

The results of midrapidity (0<y<0.8) neutral pion spectra over an extended transverse momentum range (1<pT<12 GeV/c) in √sNN=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 π± and π0 results. The nuclear modification factors R_CP and R_AA of π0 are also presented as a function of pT. In the most central Au+Au collisions, the binary collision scaled π0 yield at high pT is suppressed by a factor of about 5 compared to the expectation from the yield of p+p collisions. S...