Evidence for an Isospin -½KπEnhancement at a Mass of 1160 MeV Produced inK−nInteractions at 3.9 GeV/c

Abstract

We report the observation of an isospin-½ $K\pi$ enhancement at a mass of 1160 ± 10 MeV with a width of 90 ± 30 MeV from the reaction $K^{-}n\to K_1^{}{}_{}{}^0{\pi }^{-}n$ at 3.9 GeV/c.