Measurements of angular distributions of differential cross sections and analyzing powers of the reaction [formula omitted] between 1.3 and 2.4 GeV

Abstract

We have measured angular distributions of differential cross sections and analyzing powers ( A y ) of the reaction p p → dπ + at six incident proton energies between 1.3 and 2.4 GeV. They confirm the rapid variations at √ s = 2.65 GeV suggested by earlier experiments. Deviations from a monotonic behavior are also found in the excitation functions of the differential cross section at t = 0 or where Θ π + (c.m.) = 0°. Structures clearly appear at √ s = 2.4 and 2.65 GeV, in some coefficients of the associated Legendre function expansions of A y .