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HK: Fachverband Physik der Hadronen und Kerne
HK 5: Physik mit schweren Ionen
HK 5.5: Talk
Monday, March 12, 2007, 19:00–19:15, F
Recent Results on high-pT Physics from PHENIX — •Christoph Baumann for the PHENIX collaboration — Institut für Kernphysik, Münster, Germany
RHIC results show a strong suppression signal of neutral meson and
charged hadron yields at high transverse momentum in central Au+Au
collisions at √sNN = 200 GeV compared to a binary scaled
p+p reference. In Cu+Cu collisions at the same energy a suppression
similar in strength to that in Au+Au collisions for an equal number
of participants, has also been observed. This suppression has been
attributed to the energy loss of partons in the hot and dense matter
created in the collision, but the exact mechanism, which causes the
suppression is still under investigation.
PHENIX has measured spectra of π0, η, and non-identified
charged hadrons in various collision systems and at different
energies. These measurements can provide important information for
understanding the suppression mechanism at play. A new 62.4 GeV p+p
data set complements the existing Au+Au and Cu+Cu measurements and
serves as a crucial baseline for understanding particle production
in Au+Au and Cu+Cu collisions at the same energy. In addition, data
at 22.4 GeV have been analyzed to allow a systematic study of the
energy and collision species dependence over a broad range,
including a comparison with CERN SPS results. Additional information
of the energy loss mechanism can be derived from two and three
particle jet-correlations. We will present the latest results on
these measurements.