A study of n^-p annihilations between 0.5 and 0.8 GeV/c

Abstract

A study of n^-p annihilations with n^- momentum between 0.5 and 0.8 GeV/c is presented. The search for s-channel resonances in n^-p annihilations reveal possibly two narrow structures in the odd pions final state. Inclusive ρ⁰ and f⁰ cross sections in n^-p annihilations have been estimated to be 9.0±0.6 mb and 3.4±0.6 mb respectively. Longitudinal and transverse momentum distributions for inclusive ρ⁰ production have been presented. A study of resonance production in exclusive final state reveals ρ⁰ production to be dominant in the odd pion final states and ρ⁺, ω⁰ productions are most important for the even pion final states. The π⁺ π^- effective mass spectra in the backward and the forward directions in the n^-p c.m. system have been examined for a possible ρ-ω interference effect.