Photon and neutral pion production in Au+Au collisions at {radical}s{sub NN} = 130 GeV
We report the first inclusive photon measurements about mid-rapidity (|y| < 0.5) from {sup 197}Au + {sup 197}Au collisions at {radical}s{sub 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 {approx} 2% at 0.5 GeV has been achieved. Reconstructed photons have also been used to measure the transverse momentum (p{sub t}) spectra of {pi}{sup 0} mesons about mid-rapidity (|y| < 1) via the {pi}{sup 0} {yields} {gamma}{gamma} decay channel. The fractional contribution of the {pi}{sup 0} {yields} {gamma}{gamma} decay to the inclusive photon spectrum decreases by 20% {+-} 5% between p{sub t} = 1.65 GeV/c and p{sub t} = 2.4 GeV/c in the most central events, indicating that relative to {pi}{sup 0} {yields} {gamma}{gamma} decay the contribution of other photon sources is substantially increasing.
- Research Organization:
- Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of High Energy and Nuclear Physics. Division of Nuclear Physics; U.S. National Science Foundation; BMBF Germany, IN2P3 RA RPL EMN France, EPSRC United Kingdom, FAPESP Brazil, Russian Ministry of Science and Technology, Ministry of Education NNSFC China, SFOM Czech Republic, FOM UU Netherlands, DAE DST CSIR India, Swiss National Science Foundation (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 834432
- Report Number(s):
- LBNL--55116
- Journal Information:
- Physical Review C, Journal Name: Physical Review C Vol. 70
- Country of Publication:
- United States
- Language:
- English
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