Inclusive γ-production in p^-p 1 interactions at 12 GeV/c

Abstract

The inclusive production of photons in p^-p interactions has been studied at incident momentum of 12 GeV/c. Topological cross section has been presented and KNO distribution for p^-p interactions has been studied. Inclusive cross section for γ production has been measured to be 149.5±8.8 mb. Bulk of these photons come from π⁰ decays whose cross section has been evaluated independently to be 60.4±7.9 mb. Signals of η and ω have been seen in γγ and π⁺π^-π⁰ decay modes and their inclusive cross sections have been estimated to be 14.9±8.8 mb and 14.6±7.0 mb respectively. Results on average multiplicities of γ and two particle correlation parameters are presented. Neutral pions seem to be more strongly correlated than the charged pions. The inclusive distributions of the Feynman x and p _T ^/2 of the photons are compared with expectation from charged pions on the basis of charge independence. Energy dependence of the normalised invariant distributions has been studied. The distribution of the scaling variable z of photons in e ⁺ e^- and p^-p interactions has been compared.