Study of the hypercharge exchange reactions π+p→K+∑+ and π+p→K+∑+(1385) at 12 GeV/c

The results of the study of the π+p→K+∑+ (1) and π+p→K+∑+(1385) (2) reactions at 12 GeV/c are presented. The differential cross sections dσ/dt in|tmin|<|t|<0.8 (GeV/c)2 momentum transfer range are measured. The ∑+ polarisation for |t|<0.5 (GeV/c)2 for reaction (1) is defined. Binary reactions (1) and (2) were selected by analyzing the missing mass spectra for the forward emitted fast K+ meson. The total cross sections in the studied momentum transfer range are 20.2±2.4μb and 7.3±1.1 μb for the reactions (1) and (2) respectively. The experimental results are compared with the predictions of the Regge models which take into account rescattering and secondary singularities.