Indication of a deeply bound and compact K- pp state formed in the pp- -> pLambdaK+ reaction at 2.85 GeV

Indication of a deeply bound and compact K- pp state formed in the pp- -> pLambdaK+ reaction at 2.85 GeV

We have analyzed data of the DISTO experiment on the exclusive pp --> pLambdaK+ reaction at 2.85 GeV to search for a strongly bound compact K- pp(approximately = X) state to be formed in the pp --> K+ + X reaction. The observed spectra of the K+ missing mass and the pLambda invariant-mass with...

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Veröffentlicht in:Physical review letters 2010-04, Vol.104 (13), p.132502-132502
Hauptverfasser: Yamazaki, T, Maggiora, M, Kienle, P, Suzuki, K, Amoroso, A, Alexeev, M, Balestra, F, Bedfer, Y, Bertini, R, Bland, L C, Brenschede, A, Brochard, F, Bussa, M P, Choi, Seonho, Colantoni, M L, Dressler, R, Dzemidzic, M, Faivre, J-Cl, Ferrero, L, Foryciarz, J, Fröhlich, I, Frolov, V, Garfagnini, R, Grasso, A, Heinz, S, Jacobs, W W, Kühn, W, Maggiora, A, Panzieri, D, Pfaff, H-W, Pontecorvo, G, Popov, A, Ritman, J, Salabura, P, Sosio, S, Tchalyshev, V, Vigdor, S E
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Sprache:eng
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Zusammenfassung:We have analyzed data of the DISTO experiment on the exclusive pp --> pLambdaK+ reaction at 2.85 GeV to search for a strongly bound compact K- pp(approximately = X) state to be formed in the pp --> K+ + X reaction. The observed spectra of the K+ missing mass and the pLambda invariant-mass with high transverse momenta of p and K+ revealed a broad distinct peak of 26-sigma confidence with a mass M(X)=2267+/-3(stat)+/-5(syst) MeV/c2 and a width Gamma(X)=118+/-8(stat)+/-10(syst) MeV. The enormously large cross section indicates formation of a compact K- pp with a large binding energy of B(K)=103 MeV, which can be a possible gateway toward cold and dense kaonic nuclear matter.
ISSN:1079-7114