We have analyzed data of the DISTO experiment on the exclusive pp -> p Lambda K+ reaction at 2.85 GeV to search for a strongly bound compact K- pp(equivalent to X) state to be formed in the pp -> K+ + X reaction. The observed spectra of the K+ missing mass and the p Lambda 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/c(2) 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.

Indication of a Deeply Bound and Compact K- pp State Formed in the pp -> p Lambda K+ Reaction at 2.85 GeV

MAGGIORA, MARCO;AMOROSO, Antonio;Alexeev M;BALESTRA, Ferruccio;BERTINI, Raimondo Pietro;BUSSA, Maria Pia;FERRERO, Livio;FROLOV, VLADIMIR;GRASSO, Antonino;PANZIERI, Daniele;SOSIO, Stefano;
2010

Abstract

We have analyzed data of the DISTO experiment on the exclusive pp -> p Lambda K+ reaction at 2.85 GeV to search for a strongly bound compact K- pp(equivalent to X) state to be formed in the pp -> K+ + X reaction. The observed spectra of the K+ missing mass and the p Lambda 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/c(2) 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.
104
132502-1
132502-5
NUCLEAR CLUSTERS; SYSTEMS
Yamazaki T; Maggiora M; Kienle P; Suzuki K; Amoroso A; Alexeev M; Balestra F; Bedfer Y; Bertini R; Bland LC; Brenschede A; Brochard F; Bussa MP; Choi S; Colantoni ML; Dressler R; Dzemidzic M; Faivre JC; Ferrero L; Foryciarz J; Frohlich I; Frolov V; Garfagnini R; Grasso A; Heinz S; Jacobs WW; Kuhn W; Maggiora A; Panzieri D; Pfaff HW; Pontecorvo G; Popov A; Ritman J; Salabura P; Sosio S; Tchalyshev V; Vigdor SE
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/75481
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