We have analyzed data of the DISTO experiment on the exclusive pp→pΛK+ reaction at 2.85 GeV to search for a strongly bound compact K-pp(X) state to be formed in the pp→K ++X reaction. The observed spectra of the K+ missing mass and the pΛ invariant-mass with high transverse momenta of p and K + revealed a broad distinct peak of 26-σ confidence with a mass MX=2267±3(stat)±5(syst)MeV/c2 and a width ΓX= 118±8(stat)±10(syst)MeV. The enormously large cross section indicates formation of a compact K-pp with a large binding energy of BK=103MeV, which can be a possible gateway toward cold and dense kaonic nuclear matter.
ASJC Scopus subject areas
- Physics and Astronomy(all)