The cross section for the reaction K−+p→Λ+η was measured as a function of the incident K− momentum in the vicinity of the reaction threshold. The excitation function for this reaction including earlier data confirms the existence of Λ (1670) with a mass and width of 1668 MeV/c2 and 15 MeV/c2 decaying into Λη with xe1xΛη=0.040. In addition, the behavior of the excitation function as well as the Λ angular distributions and polarization strongly suggest the existence of Λ (1690) with a mass and width of 1680 MeV/c2 and 10 MeV/c2 decaying into Λη with xe1xΛη=0.025.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of the Physical Society of Japan|
|State||Published - 1977|