First exclusive measurements of the K − pp state populated in the pp → K + Λ p reaction at 2.85 GeV
HYPERFINE INTERACTIONS（2009）
摘要
We have analyzed data of the DISTO experiment on the exclusive pp → K + Λ p process at T p = 2.85 GeV to search for a K − pp ( ≡ X ) nuclear bound state to be formed in the pp → K + + X reaction. The deviation spectra of the K + missing-mass Δ M ( K + ) and Λ p invariant-mass M (Λ p ) with selection of large-angle proton emission revealed a structure with M X = 2265 ±2 MeV/ c 2 and Γ X = 118 ±8 MeV.
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