We have analyzed data of the DISTO experiment on the exclusive pp ! K+p process at Tp = 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 M(K+) and p invariant-mass M(p) with selection of large-angle proton emission revealed a structure with MX = 2265 ± 2 MeV/c2 and X = 118 ± 8 MeV.
First exclusive measurements of the K- pp state populated in the pp ---> K+ Lambda p reaction at 2.85-GeV
MAGGIORA, MARCO;M. Alexeev;BALESTRA, Ferruccio;BERTINI, Raimondo Pietro;M. P. Bussa;CHIOSSO, Michela;FERRERO, Livio;FROLOV, VLADIMIR;GRASSO, Antonino;PANZIERI, Daniele;ZOSI, Gianfranco
2008-01-01
Abstract
We have analyzed data of the DISTO experiment on the exclusive pp ! K+p process at Tp = 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 M(K+) and p invariant-mass M(p) with selection of large-angle proton emission revealed a structure with MX = 2265 ± 2 MeV/c2 and X = 118 ± 8 MeV.
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