Determination of γ^direct/π⁰ using photon-charge particle correlation measurement in high energy heavy ion and pp collisions

2005/08/22 by S. Chattopadhyay, Chattopadhyay, Subhasis
Physics and Astronomy · #FOS: Physical sciences #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.nucl-ex/0508023

openalex publication_date 2005/08/22 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28

Abstract

A method has been proposed for the determination of γ to π⁰ 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 π⁰. 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 π⁰ events is compared with correlation peaks from other set of events where trigger particle contains photons for direct-photon jets alongwith π⁰. The comparative study in reduction of yield of near angle peak is used to extract photon fraction.

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