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19 April 2024

» arxiv » 1102.0482

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Role of the Lambda(1405) in the Formation of the X = K-pp Deeply Bound States Revealed in the pp rightarrow X + K+ Reaction at 2.50 GeV and 2.85 GeV
P. Kienle ; M. Maggiora ; K. Suzuki ; T. Yamazaki ; M. Alexeev ; A. Amoroso ; F. Balestra ; Y. Bedfer ; R. Bertini ; L. C. Bland ; A. Brenschede ; F. Brochard ; M. P. Bussa ; Seonho Choi ; M. L. Colantoni ; R. Dressler ; M. Dzemidzi ; J.-Cl. Faivre ; L. Ferrero ; J. Foryciarz ; I. Frohlich ; 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 ;
Date:	2 Feb 2011
Abstract:	We have analyzed data of the DISTO experiment on the exclusive pp rightarrow p Lambda K+ reaction at 2.50 GeV and 2.85 GeV incident energy and found that a previously reported X = K-pp rightarrow p Lambda with M_X = 2267 MeV/c2 and a width Gamma_X = 118$ MeV, in the reaction channel pp rightarrow K+ + X at 2.85 GeV, is not populated at 2.50 GeV, though it is kinematically allowed and is expected to be produced as much as 50 % of that at 2.85 GeV. The absence of X at 2.50 GeV is in line with the very weak production of Lambda (1405) at 2.50 GeV toward its production threshold, thus giving a direct evidence that Lambda (1405) is the doorway state for the formation of K-pp with a high p-Lambda(1405) sticking probability at 2.85 GeV.
Source:	arXiv, 1102.0482
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