Abstract
We present results on the differential cross-sections for the reactions π +p → K + Σ +(1385) and K −p → π − Σ +(1385) at 10 GeV/ c. For the first time, the same equipment has been used in measuring both reactions, in order to obtain good relative normalization. In the region of low t ( t min to −0.3 (GeV/ c) 2) the two differential cross-sections have similar shape, and show a sharp forward dip indicating a dominant helicity flip contribution. However, the magnitudes of the cross-sections are significantly different, indicating substantial exchange degeneracy breaking. We find the ratio of the integrated cross-sections for the reactions K −p → π − Σ +(1385) and π +p → K + Σ +(1385) over the range −0.3 < t′ < 0.0 (GeV/ c) 2 to be 2.0 ± 0.2.
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