Energy Dependence of $$\bar{K}N$$ Interactions and Resonance Pole of Strange Dibaryons

Journal Article · Wed Sep 01 04:00:00 EDT 2010 · Progress of Theoretical Physics (Kyoto)

DOI:https://doi.org/10.1143/PTP.124.533· OSTI ID:1259272

Ikeda, Y. ^[1]; Kamano, H. ^[2]; Sato, T. ^[3]

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1. Univ. of Tokyo, Tokyo (Japan). Dept. of Physics; Inst. of Physical and Chemical Research (RIKEN), Wako (Japan). Nishina Center for Accelerator-Based Science
2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States). Excited Baryon Analysis Center (EBAC)
3. Osaka Univ. (Japan). Dept. of Physics

We study the resonance energy of the strange dibaryons using two models with the energy-independent and energy-dependent potentials for the s-wave $$\bar{K}N$$ 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 $$\bar{K}N$$ - $$\pi\Sigma$$ 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 $$\bar{K}NN$$, and another is the resonance of the $$\pi Y N$$ 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 $$\bar{K}N$$ -$$\pi\Sigma$$ around the $$\Lambda(1405)$$ region.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); Japan Society for the Promotion of Science
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1259272
• Report Number(s): JLAB-THY--10-1172; DOE/OR/--23177-1202
• Journal Information: Progress of Theoretical Physics (Kyoto), Journal Name: Progress of Theoretical Physics (Kyoto) Journal Issue: 3 Vol. 124; ISSN 0033-068X
• Country of Publication: United States
• Language: English

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