2,289 research outputs found
Results on High p_T Particle Production from the PHENIX Experiment at RHIC
Transverse momentum (p_T) spectra of neutral pions and charged hadrons
measured in Au+Au and d+Au collisions at sqrt{s_NN}=200 GeV by the PHENIX
experiment at RHIC are compared to p+p reference spectra at the same
sqrt{s_NN}. In central Au+Au collisions a factor 4-5 suppression for neutral
pions and charged hadrons with p_T > 5 GeV/c is found relative to the p+p
reference scaled by the nuclear overlap function . In contrast, such a
suppression of high p_T particles is absent in d+Au collisions.Comment: To appear in the proceedings of the 8th International Conference on
Nucleus-Nucleus Collisions (NN 2003), Moscow, Russia, 17-21 Jun 2003 (4
pages, 3 figures), V1: error fixed in caption of Fig.
Production of Neutral Pions and Eta-mesons in pp Collisions Measured with ALICE
Invariant cross sections for neutral pions and eta mesons in pp collisions at
sqrt(s) = 0.9, 2.76, and 7 TeV were measured by the ALICE detector at the Large
Hadron Collider. Next-to-leading order (NLO) perturbative QCD calculations
describe the pi0 and eta spectra at 0.9 TeV, but overestimate the measured
cross sections at 2.76 TeV and 7 TeV. The measured eta/pi0 ratio is consistent
with mT scaling at 2.76 TeV. At 7 TeV indications for a violation of mT scaling
were found.Comment: 4 pages, 2 figures, to appear in the proceedings of the XXII
International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions,
Quark Matter 2011, Annec
Results on Photon Production in Au+Au Collisions at RHIC
The status of the search for direct photons in Au+Au collisions at sqrt{s_NN}
= 130 GeV and sqrt{s_NN} = 200 GeV with the PHENIX experiment is presented.
Within errors, no excess of direct photons was found in a first analysis pass
done on a limited data set. Significantly reduced systematic and statistical
uncertainties are expected in future analyses.Comment: 4 pages, 3 figures. Talk presented at the Quark Matter 2002
conference, Nantes, France, July 18-24, 2002. To appear in the proceedings
(Nucl. Phys. A
- …