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

Authors :: 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.
Froehlich, I.
Frolov, V.
Garfagnini, R.
Grasso, A.
Heinz, S.
Jacobs, W. W.
Kuhn, W.
Maggiora, A.
Panzieri, D.
Pfaff, H. -W.
Pontecorvo, G.
Popov, A.
Ritman, J.
Salabura, P.
Sosio, S.
Tchalyshev, V.
Vigdor, S. E.
Source :: Phys.Rev.Lett.104:132502,2010
Publication Year :: 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 (= 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.<br />Comment: 4 pages, 4 figures

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