Photon And Neutral Pion Production In Au Plus Au Collisions At Root S(Nn)=130 Gev

Jenni R. Adams,Carl G. Adler,M. M. Agganval,Zubayer Ahammed,J. Amonett,Bryon D. Anderson,Michael G. Anderson,Dmitry A. Arkhipkin.,G. S. Averichev,SK K. Badyal,Jan T. Balewski,Olga Barannikova,L. S. Barnby,Jérôme Baudot,Selemon Bekele,V. V. Belaga,René Bellwied,Jens Ph Berger,Betty I. Bezverkhny,Sanjeev Bhardwaj,Partha Bhaskar,Ashok Kumar Bhati,Hans C. Bichsel,Anja E M Billmeier,L. C. Bland,C. O. Blyth,B. E. Bonner,Michiel A J Botje,A. Boucham,A. V. Brandin,Alessandro Bravar,Robert V. Cadman,Xiangzhou Cai,Helen Louise Caines,Manuel Calderón De La Barca Sánchez,Jim B. Carroll,Javier Sarmiento Castillo,María J. Castro,Daniel A. Cebra,Petr Chaloupka,Subhasis Chattopadhyay,Hui Chen,Yang Chen,S. P. Chernenko,Michael Gerard Cherney,Alexei A. Chikanian,Bernard Choi,William B. Christie,Jean Pierre Michel Coffin,Thomas Michael Cormier,John G. Cramer,Henry J. Crawford,Debasish Das,Santosh K. Das,A. A. Derevschikov,Lidia A. Didenko,Thomas Dietel,Xin Dong,James E. Draper,Fei Du,Anand Kumar Dubey,V. B. Dunin,James C. Dunlop,M. R Dutta Majumdar,Volker Eckardt,L. G. Efimov,V. V. Emelianov,J. M. Engelage,G. Eppley,Barbara Erazmus,Magali Danielle Estienne,Patricia Fachini,V. Faine,Julien Cl Faivre,Renee D. Fatemi,Kirill V. Filimonov,Petr Filip,L. Evan Finch,Yu V. Fisyak,D. Flierl,K. J. Foley,Jun Fu,Cari A. Gagliardi,Murthy S. Ganti,Thomas D. Gutierrez,Nikolai D. Gagunashvili,J. Gans,Ludovic Gaudichet,Marie Germain,Frank J M Geurts,V. Ghazikhanian,Premomoy S. Ghosh,J. E. González,O. A. Grachov,Vladislav A. Grigoriev,S. Gronstal,David P. Grosnick,M. Guedon,Steven M. Guertin

PHYSICAL REVIEW C(2004)

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Abstract
We report inclusive photon measurements about midrapidity (\y\<0.5) from Au-197+Au-197 collisions at roots(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 DeltaE/Eapproximate to2% at 0.5 GeV has been achieved. Reconstructed photons have also been used to measure the transverse momentum (p(t)) spectra of pi(0) mesons about midrapidity (\y\<1) via the pi(0)-->gammagamma decay channel. The fractional contribution of the pi(0)-->gammagamma decay to the inclusive photon spectrum decreases by 20%+/-5% between p(t)=1.65 GeV/c and p(t)=2.4 GeV/c in the most central events, indicating that relative to pi(0)-->gammagamma decay the contribution of other photon sources is substantially increasing.
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