Production of Δ0(1232)-resonances in p + 12C collisions at a momentum of 4.2 GeV/c

Abstract

The production of Δ 0(1232)-resonances in p + 12C collisions at 4.2 GeV/c was investigated with 4π acceptance. The masses and widths of the resonances were obtained from ananalysis of foreground and background invariant-mass distributions of pπ − pairs obtained using an angular criterion. The fraction of charged π −-mesons coming from the Δ 0(1232) decay was estimated and compared to those obtained in earlier analyses. The momentum, transverse momentum, kinetic energy, rapidity, and emission angle distributions as well as the invariant cross-sections of Δ 0(1232)-resonances werere constructed in the laboratory frame. The freeze-out temperature of theΔ 0(1232)-resonances produced in p + 12C collisions was estimated and compared to the freeze-out temperatures obtained using different methods for Δ(1232)-resonances produced in other experiments with different sets of colliding nuclei at various incident energies.