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

Abstract

Analyzing DISTO data of $pp->pLambda{K}^{+}$ 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 $Gamm{a}_X=118$ 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).

5 pages, 4 figures

References in corpus (3)

• Indication of a deeply bound compact K-pp state formed in the pp -> p Lambda K+ reaction at 2.85 GeV
• The basic K nuclear cluster K- pp and its enhanced formation in the p + p -> K+ + X reaction
• Lineshape of the Lambda(1405) Hyperon Measured Through its Sigma0 pion0 Decay

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