Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2005-08-22
Physics
Nuclear Physics
Nuclear Experiment
6 pages, 6 figures
Scientific paper
A method has been proposed for the determination of $\gamma$ to $\pi^0$ ratio in high energy pp and nucleus-nucleus collisions at large transverse momentum ($p_T$). In photon measuring device, it is proposed that shower shape analysis is made to select only cases with wide showers. These candidates come mostly from $\pi^0$. Correlation is measured between those photon candidates as trigger particles and associated charged particles above selected $p_T$. The ratio of yields of near and far angle correlation peaks for $\pi^0$ events is compared with correlation peaks from other set of events where trigger particle contains photons for direct-photon jets alongwith $\pi^0$. The comparative study in reduction of yield of near angle peak is used to extract photon fraction.
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