Reactions K −p → Σ+π− and K t- p → Σ−π+ at 3.13 and 3.30 GeV/ c

Abstract

We have measured the differential cross sections for K −p→ Σ + π − and K −p→ Σ − π + scattering, and the polarization distribution of the Σ + in the first reaction, at K − lab momenta of 3.13 and 3.30 GeV/ c. Our K −p→ Σ + π − cross sections are at least 40% larger than interpolations between measurements at nearby momenta. A comparison using isospin conservation of K − p→Σ +π −, K − p→Σ −π +, and K 0 p→ Σ 0π + cross sections favors our results. The K −p→ Σ + π − differential cross sections have about the same shape and are about twice as large as corresponding K −p→ Λπ 0 differential cross sections across the whole forward region. We discuss the results briefly with reference to simple exchange models.