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Formation of the $S=-1$ resonance X(2265) in the reaction $pp -> X + K^+$ at 2.50 and 2.85 GeV

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arxiv 1102.0482 v2 pith:4V6JEIWN submitted 2011-02-02 nucl-ex

P. Kienle , M. Maggiora , K. Suzuki , T. Yamazaki , M. Alexeev , F. Balestra , Y. Bedfer , R. Bertini
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L. C. Bland A. Brenschede F. Brochard M.P. Bussa M. Chiosso Seonho Choi M. L. Colantoni R. Dressler M. Dzemidzic J.-Cl. Faivre A. Ferrero L. Ferrero J. Foryciarz I. Froehlich V. Frolov R. Garfagnini A. Grasso S. Heinz W. W. Jacobs W. Kuehn A. Maggiora D. Panzieri H.-W. Pfaff G. Pontecorvo A. Popov J. Ritman P. Salabura V. Tchalyshev F. Tosello S.E. Vigdor G. Zosi
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abstract

Analyzing DISTO data of $pp -> p Lambda K^+$ at $T_p = 2.50$ and 2.85 GeV to populate a previously reported X(2265) resonance with $M_X = 2267$ MeV/$c^2$ and $Gamma_X = 118$ MeV at 2.85 GeV, we found that the production of X(2265) at 2.50 GeV is much less than that at 2.85 GeV (less than 10%), though it is expected from a kinematical consideration to be produced as much as 33% of that at 2.85 GeV. The small population of X(2265) at 2.50 GeV is consistent with the very weak production of Lambda (1405) at the same incident energy toward its production threshold, thus indicating that Lambda (1405) plays an important role as a doorway state for the formation of X(2265).

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