4.5 Article

Construction of a local (K)over-bar N-π Σ-π Λ potential and composition of the Λ(1405)

Journal

PHYSICAL REVIEW C
Volume 98, Issue 2, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.98.025201

Keywords

-

Funding

  1. JSPS KAKENHI [JP16K17694, JP17J11386]
  2. JSPS Japan-France Joint Research Project
  3. Yukawa International Program for Quark-Hadron Sciences (YIPQS)
  4. DFG Cluster of Excellence Origin and Structure of the Universe

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A (K) over bar N-pi Sigma-pi Lambda coupled-channel potential is constructed on the basis of chiral SU(3) dynamics. Several matching conditions are introduced to formulate an equivalent local potential that reproduces the coupled-channel scattering amplitudes resulting from chiral SU(3)(L) x SU(3)(R) meson-baryon effective field theory. In contrast to a previously constructed effective single-channel (K) over bar N potential, the explicit treatment of the pi Sigma channel yields a natural description of the low-mass pole as part of the two-pole structure of the Lambda(1405) resonance. The energy dependence of the potential can now be parametrized with a minimum of polynomial orders. To study the properties of the Lambda(1405) as a quantum-mechanical quasibound state, we derive the normalization condition of its wave function generated by the energy-dependent coupled-channel potential, using the Feshbach projection method. This framework provides an improved understanding of this system from the viewpoint of the compositeness of hadrons. With the properly normalized wave function, we demonstrate and confirm that the high-mass pole of the Lambda(1405) is dominated by the (K) over bar N component.

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