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arxiv: 0912.5116 · v1 · pith:IB56F2KCnew · submitted 2009-12-28 · ✦ hep-ex

DISTO data on Kpp

M. Maggiora , P. Kienle , K. Suzuki , T. Yamazaki , DISTO Collaboration: M. Alexeev , A. Amoroso , F. Balestra , Y. Bedfer
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R. Bertini L. C. Bland A. Brenschede F. Brochard M. P. Bussa S. Choi M. L. Colantoni R. Dressler M. Dzemidzic J. Cl. Faivre L. Ferrero J. Foryciarz I. Fr\"ohlich V. Frolov R. Garfagnini A. Grasso S. Heinz W. W. Jacobs W. K\"uhn A. Maggiora D. Panzieri S. Sosio H. W. Pfaff G. Pontecorvo A. Popov J. Ritman P. Salabura V. Tchalyshev S. E. Vigdor
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classification ✦ hep-ex
keywords datadistolambdaacquiredbeenbinaryboundbroad
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The data from the DISTO Collaboration on the exclusive pp -> p K+ Lambda production acquired at T_p = 2.85 GeV have been re-analysed in order to search for a deeply bound K- pp (= X) state, to be formed in the binary process pp -> K+ X. The preliminary spectra of the DeltaM_{K+} missing-mass and of the M_{p Lambda} invariant-mass show, for large transverse-momenta of protons and kaons, a distinct broad peak with a mass M_X = 2265 +- 2 MeV/c^2 and a width Gamma_X = 118 +- 8 MeV/c^2.

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