Energy dependence of barKN interactions and resonance pole of strange dibaryons

Hiroyuki Kamano (Jefferson Lab); Toru Sato (Osaka U.); Yoichi Ikeda (RIKEN & Tokyo U.)

Energy dependence of barKN interactions and resonance pole of strange dibaryons

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arxiv 1004.4877 v1 pith:4NFALTD6 submitted 2010-04-27 nucl-th hep-ph

Yoichi Ikeda (RIKEN & Tokyo U.) , Hiroyuki Kamano (Jefferson Lab) , Toru Sato (Osaka U.) This is my paper · ORCID

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keywords resonancebarkndibaryonspotentialstrangeenergyenergy-dependentenergy-independent

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We study the resonance energy of the strange dibaryons using two models with the energy-independent and energy-dependent potentials for the s-wave barKN interaction, both of which are derived by certain reductions from the leading order term of the effective chiral Lagrangian. These potential models produce rather different off-shell behaviors of the two-body barKN - piSigma amplitudes in I=0 channel, i.e., the model with energy-independent (energy-dependent) potential predicts one (two) resonance pole in the Lambda(1405) region, while they describe the available data equally well. We find that the energy-independent potential model predicts one resonance pole of the strange dibaryons, whereas the energy-dependent potential model predicts two resonance poles: one is the shallow quasi-bound state of the barKNN, and another is the resonance of the piYN with large width. An investigation of the binding energy of the strange dibaryons will make a significant contribution to clarify resonance structure of s-wave barKN - piSigma around the Lambda(1405) region.

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