https://doi.org/10.1140/epjc/s2005-02324-8
Experimental Physics
Medium effects on high 
particle production measured with the PHENIX experiment
Received:
14
March
2005
Revised:
20
May
2005
Published online:
8
July
2005
Transverse momentum () spectra measured by the PHENIX experiment at RHIC in Au + Au, d + Au and pp collisions at 
and in Au + Au collisions at 
are presented. A suppression of the yield of high hadrons in central Au + Au collisions by a factor 4-5 at 
is found relative to the pp reference scaled by the nuclear overlap function 
. In contrast, direct photons are not suppressed in central Au + Au collisions and no suppression of high particles can be seen in d + Au collisions. This leads to the conclusion that the dense medium formed in central Au + Au collisions is responsible for the suppression.
© Springer-Verlag, 2005
