The π−d breakup reaction and Δ's in the deuteron

Abstract The cross section for forward protons in the reaction π − d→pX has been measured at 1.046, 1.113 and 1.180 GeV/ c . The observed cross section decreases with proton angle, in contrast with an impulse approximation calculation of π − p(n)→ π − p(n), but in agreement with a description of the reaction in terms of a ΔΔ-component. Using the cross section estimate by Nath et al., an upper limit for the ΔΔ-probability of 0.4% is deduced from the present data.