Photon and neutral pion production in Au + Au collisions at sqrt[sNN ]=130 GeV

We report inclusive photon measurements about midrapidity ( |y| <0.5 ) from 197 Au + 197 Au collisions at sqrt[sNN ]=130 GeV at RHIC. Photon pair conversions were reconstructed from electron and positron tracks measured 
We report inclusive photon measurements about midrapidity ( |y| <0.5 ) from 197 Au + 197 Au collisions at sqrt[sNN ]=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 pi 0 mesons about midrapidity ( |y| <1 ) via the pi 0 --> gamma gamma decay channel. The fractional contribution of the pi 0 --> gamma gamma 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 pi 0 --> gamma gamma decay the contribution of other photon sources is substantially increasing.
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Metadaten
Author:J. Adams, Clemens Adler, Jens Berger, Thomas Dietel, Dominik Bernhard Flierl, Thorsten Kollegger, Jens Sören Lange, Reinhard Stock, Christof Struck, et al., STAR Collaboration
URN:urn:nbn:de:hebis:30-19062
Document Type:Article
Language:English
Date of Publication (online):2005/10/14
Year of first Publication:2004
Publishing Institution:Univ.-Bibliothek Frankfurt am Main
Release Date:2005/10/14
Source:Phys. Rev. C 70, 044902 (2004), ©2004 The American Physical Society, http://link.aps.org/abstract/PRC/v70/e044902
HeBIS PPN:191765074
Institutes:Physik
Dewey Decimal Classification:530 Physik
PACS-Classification:25.75.Dw Particle and resonance production
Sammlungen:Universitätspublikationen
Licence (German):License Logo Veröffentlichungsvertrag für Publikationen

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