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arxiv: 1002.3526 · v1 · submitted 2010-02-18 · ⚛️ nucl-ex

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

T. Yamazaki , M. Maggiora , P. Kienle , K. Suzuki , A. Amoroso , M. Alexeev , F. Balestra , Y. Bedfer
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R. Bertini L. C.Bland A. Brenschede F. Brochard M. P. Bussa Seonho Choi M. L. Colantoni R. Dressler M. Dzemidzic J.-Cl. Faivre L. Ferrero J. Foryciarz I. Froehlich V. Frolov R. Garfagnini A. Grasso S. Heinz W. W. Jacobs W. Kuhn A. Maggiora D. Panzieri H.-W. Pfaff G. Pontecorvo A. Popov J. Ritman P. Salabura S. Sosio V. Tchalyshev S. E. Vigdor
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keywords lambdareactionboundcompactformedk-ppstatstate
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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 (= 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 with a mass M_X = 2265 +- 2 (stat) +- 5 (syst) MeV/c2 and a width Gamma_X = 118 +- 8 (stat) +- 10 (syst) MeV.

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