Further tests of exchange degeneracy and duality using the KN charge exchange reactions

Abstract

Analysis of the sums and differences of the KN charge exchange angular distributions from 1 to 12 GeV/c provide strong quantitative evidence that the ϱ and the A2 Regge trajectories are exchange degenerate. The contribution of the effective secondary trajectory or cut responsible for the breaking of duality (dσ/dt (K+n → Kop) ≠ dσ/dt (K−p → Kon) for r ≠ 0) in these reactions is shown to be unimportant above ∼ 3 GeV/c. The SU(3) charge exchange sum rule is shown to be valid down to 1.25 GeV/c, implying a strong connection with the duality principle. This sum rule is used to predict angular distributions for the reaction π−p → ηn at 1.6 and 2.3 GeV/c.