Study of the Enhancement in theΛpInvariant Mass Near theΣΛThreshold inK−d→Λpπ−Interactions Around 1.0 GeV/c

Abstract

Data are presented for the reaction $K^{-}d\to \Lambda {\pi }^{-}p$ at 910, 1007, and 1106 MeV/c in which the proton momentum is greater than 250 MeV/c. The $\Lambda p$ invariant-mass plot shows an enhancement at about 2130 MeV, similar to that found by Cline, Laumann, and Mapp. No enhancement is seen at about 1440 MeV in the $\Lambda \pi$ invariant mass. A simple two-step process describes our data as well as those of Cline, Laumann, and Mapp without the use of resonances.