Recent results on 32 GeV/c K+-p and anti pp interactions in the Mirabelle bubble chamber

This report is a summary of the recent results obtained by the France-Soviet Union and CERN-Soviet Union Collaborations with the 4.6 m Mirabelle hydrogen bubble chamber exposed at the Serpukhov accelerator to separated K+, K- and anti p beams at 32GeV/c. These results are based on the analysis of 100 K, 80K and 12 K pictures of K+, K- and anti p experiments respectively. The data are presented together allowing a useful comparison between the K+ p, K- p and anti pp interactions. The PI deg average multiplicity is almost identical in three experiments (1.89 +- 0.05), (1.96+-0.05) and (1.80 +-0.15) for K+ p, K- p and anti pp interactions respectively. The average multiplicity of PI+ and PI- are found to be quite compatible with the PI deg multiplicity. The inclusive cross sections for the reactions A + p → Ksup(n) + x are (7.6 +-0.2), (9.8+-0.25) and (6.3+-0.6) mb for A=K+, K- and anti p respectively. The inclusive production cross section for Δ (and epsilon deg) amounts to (0.8+-0.08), (2.35+-0.08) and (1.7+-0.3) mb in K+ p, K- p and anti pp interactions respectively. Results on the total and differential cross sections of K- p elastic scattering are presented. The cross sections of reactions A p → A p + n (PI + PI-) where A = K+, K-, anti p have been measured. The energy dependence of the four-body reactions shows a steeper decrease for K+ and anti p incident particles, than for K-. For K+, K-, anti p reactions the plot of PI+ rapidity versus PI- rapidity is for presenting of clustering effects in the four body reactions