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Analyzing DISTO data of $pp -> p Lambda K^+$ at $T_p = 2.50$ and 2.85 GeV topopulate 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) at2.50 GeV is much less than that at 2.85 GeV (less than 10%), though it isexpected from a kinematical consideration to be produced as much as 33% of thatat 2.85 GeV. The small population of X(2265) at 2.50 GeV is consistent with thevery weak production of Lambda (1405) at the same incident energy toward itsproduction threshold, thus indicating that Lambda (1405) plays an importantrole as a doorway state for the formation of X(2265).

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