Eur. Phys. J. Special Topics 155, 27-36 (2008)
https://doi.org/10.1140/epjst/e2008-00586-1
https://doi.org/10.1140/epjst/e2008-00586-1
Recent results on jet energy loss and direct photons at RHIC
Brookhaven National Laboratory, Upton, NY, 11961, USA
Corresponding author: david@bnl.gov
Measurements of the π0 and direct photon nuclear modification
factors in p+p and A+A collisions in the PHENIX experiment
at RHIC will be reviewed and
recent results at 
GeV will be presented. Using
for the first time the p+p reference measured in the same
experiment instead of averaging world data the π0 suppression
turns out to be almost as large at 
GeV as at
GeV, implying gluon densities dNg/dy>800.
Possible origins of photon suppression at high pT in
GeV are discussed in light of the new results on
photon RAA at GeV.
© EDP Sciences, Springer-Verlag, 2008
