Excited Hyperon of Mass 1520 Mev

Abstract

Investigations of the K-p interaction at about 400 Mev/c were made. Cross seetions for K- momenta were measured, and momentum dependence of the cross section for reactions K- + p - A + pi /sup +/ + pi - and K- + p - K + n was observed. Existence of an excited hyperon with l520 plus or minus 3 Mev mass, r/2 = 8 Mev half width, 0 isotopic spin, even parity with respect to K-p (D,.), and branching ratios of KN: SIGMA pi of DELTA 2 pi = 3 of 5: 1 was established. (L.N.N.)