First exclusive measurements of the K-pp state - populated in the pp to K+ Lambda p reaction at 2.85 GeV
Abstract
We have analyzed data of the DISTO experiment on the exclusive pp to K+ Lambda p process at Tp = 2.85 GeV to search for a K-pp (= X) nuclear bound state to be formed in the pp to K+ + X reaction. The deviation spectra of the K+ missing-mass MM (K+) and Lambda p invariant-mass M(Lambda-p) with selection of large-angle proton emission revealed a structure with MX = 2265 +- 2 MeV/c2 and GammaX = 118 +- 8 MeV.
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