Photon and neutral pion production in Au+Au collisions at {radical}(s{sub NN})=130 GeV

Journal Article · Fri Oct 01 00:00:00 EDT 2004 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.70.044902· OSTI ID:20695676

Adams, J; Blyth, C O; Jones, P G; Lamont, M A.C.; Nelson, J M ^[1]; Adler, C; Berger, J; Dietel, T; Flierl, D; Kollegger, T; Lange, S; Stock, R; Struck, C ^[2]; Aggarwal, M M; Bhati, A K; Kumar, A; Sharma, M; Sood, G ^[3]; Ahammed, Z; Herston, T ^[4]

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1. University of Birmingham, Birmingham (United Kingdom)
2. University of Frankfurt, Frankfurt (Germany)
3. Panjab University, Chandigarh 160014 (India)
4. Purdue University, West Lafayette, Indiana 47907 (United States); and others

We report inclusive photon measurements about midrapidity (|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_equal}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 midrapidity (|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.

• OSTI ID: 20695676
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 70, Issue 4; Other Information: DOI: 10.1103/PhysRevC.70.044902; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BROOKHAVEN RHIC
ELECTRONS
ENERGY RESOLUTION
GEV RANGE
GOLD 197 REACTIONS
GOLD 197 TARGET
INTERNAL PAIR PRODUCTION
MULTIPARTICLE SPECTROMETERS
PARTICLE DECAY
PARTICLE IDENTIFICATION
PARTICLE TRACKS
PHOTONS
PIONS NEUTRAL
POSITRONS
REST MASS
TIME PROJECTION CHAMBERS
TRANSVERSE MOMENTUM