Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2011-02-02
Physics
Nuclear Physics
Nuclear Experiment
4 pages, 3 figures
Scientific paper
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.
Alexeev M.
Amoroso A.
Balestra F.
Bedfer Yann
Bertini R.
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