Abstract
The results of midrapidity neutral pion spectra over an extended transverse momentum range in 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 and results. The nuclear modification factors and of are also presented as a function of . In the most central collisions, the binary collision scaled yield at high is suppressed by a factor of about 5 compared to the expectation from the yield of 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.
2 More- Received 16 July 2009
DOI:https://doi.org/10.1103/PhysRevC.80.044905
©2009 American Physical Society