Results of the investigation of some correlation effects in π−p interactions at 40 GeV/c incident momentum are given. On the basis of 2 000 events the dependence of the transverse momenta of π+ and π− mesons on the longitudinal momenta was obtained, as well as two- particle distributions for various pion pairs, and correlation functions C(y1, y2) and R(y1, y2). For π+π− pairs R(0,0) = 0.65 ± 0.07 and the correlation length is L = 1.8 ± 0.2 for −1 ⩽ y1, y2 ⩽ 1. For π+π+ and π−π− pairs R(0,0) = 0.26 ± 0.10. Comparison of these results with proton-proton data at 200 GeV and at ISR energies suggests that limiting behaviour in two- particle distributions R(y1,y2) for π−p interactions is already reached at 40 GeV.

Results on the inclusive and topological cross sections for Λ and K0 particles produced in π−p, π−n and π−C interactions at 40 GeV/c are reported. The σΛ(Σ0)π−p values increases twofold from 25 to 40 GeV/c while σKKπ−p increases continuously with the incident momentum. The invariant single-particle distributions in the χ and p⊥2 variables for K10 and Λ particles are presented and compared with the respective ones for π−p interactions at lower energies as well as for pp interactions at 200–300 GeV/c.

In this paper, some results on inclusive γ and π0 spectra in π−p and π−12C interactions at 40 GeV/c are reported. It is shown that there is no factorization of the structure function f(q⊥, x) in π−p→γ + anything reactions for q⊥⩽0.4 GeV/c and |x|⩽0.16. The π0 meson longitudinal momentum spectrum in the cms is obtained by applying the method of statistical regularization to the measured γ spectrum. In the range |x|⩽0.02, Nπ+ = Nπ− = Nπ0 within the error limits (±7%). The inclusive γ spectra in π−p and π−12C interactions indicate that the normalized structure function is the same for both reactions over the central and the π− meson fargmentation regions.

Data on inclusive reactions π−p → π± + … and π−n → π± + … at 40 GeV/c are presented. Inclusive cross sections of the reactions π−p → π± + … at x = 0 normalized to the inelastic cross section coincide with the ISR results for pp interactions at 500 – 1500 GeV. A similar result has been obtained for the inclusive process π−p → γ + … as well.

The scaling properties of the semi-inclusive reactions π−p → π−+(n−1) charged + neutrals at 7.5 and 21 GeV/c are analysed. The distributions of the h-functions on the x-variable for π− particles indicate the presence of a limited scaling. The choosing of a certain value for the reduced charged multiplicity n〈n〉 is pointed out.