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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Analyzing DISTO data of pp → pΛK + at T p = 2.50 and 2.85GeV to populate a previously reported X(2265) -resonance with M x = 2267 MeV/c2 and Γ x = 118 MeV at 2.85GeV, we found that the yield of X(2265) at 2.50GeV is much less than that at 2.85GeV (less than 10%), though it is expected from a kinematical consideration to be produced as much as 33% of that at 2.85GeV. The small population of X(2265) at 2.50GeV is consistent with the very weak production of Γ(1405) at the same incident energy toward its production threshold, thus indicating that Γ(1405) plays an important role as a doorway state for the formation of X(2265).
KeywordsIncident Energy Excitation Function Dalitz Plot Acceptance Correction Intermediate Boson
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