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Photon and neutral pion production in Au + Au collisions at s(NN)**(1/2) = 130-GeV

The collaboration
Phys.Rev.C 70 (2004) 044902, 2004.

Abstract (data abstract)
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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Data for the electron-positron invariant mass plots

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dE/dx deviant distributions of positive daughters

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Data for the number of reconstructed photon conversions as a function of conversion location plots

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Data for the number of reconstructed photon conversions as a function of conversion location plots

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Corrected photon spectra, pT

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Corrected photon spectra, y

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Data for the two-photon invariant mass plots

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π0 transverse momentum spectra

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π0 contribution in the photon spectra spectra