Photon and neutral pion production in Au+Au collisions at sqrt(s_{NN}) = 130 GeV

Details Photon and neutral pion production in Au+Au collisions at sqrt(s_{NN}) = 130 GeV Photon and neutral pion production in Au+Au collisions at sqrt(s_{NN}) = 130 GeV

2004-01-08

arxiv.org/abs/nucl-ex/0401008v1

Phys.Rev.C70:044902,2004

Physics

Nuclear Physics

Nuclear Experiment

13 pages, 14 figures, submitted to Phys. Rev. C

Scientific paper

10.1103/PhysRevC.70.044902

We report the first inclusive photon measurements about mid-rapidity (|y|<0.5) from Au+Au collisions at sqrt(s_{NN}) = 130 GeV at RHIC. Photon pair conversions were reconstructed from electron and positron tracks measured with the Time Projection Chamber (TPC) of the STAR experiment. With this method, an energy resolution of Delta(E)/E = 2% at 0.5 GeV has been achieved. Reconstructed photons have also been used to measure the transverse momentum (pt) spectra of pi0 mesons about mid-rapidity (|y|<1) via the pi0 -> photon photon decay channel. The fractional contribution of the pi0 -> photon photon decay to the inclusive photon spectrum decreases by 20% +/- 5% between pt = 1.65 GeV/c and pt = 2.4 GeV/c in the most central events, indicating that relative to pi0 -> photon photon decay the contribution of other photon sources is substantially increasing.

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