Speaker
Dr
Takayasu Sekihara
(Tokyo Institute of Technology)
Description
The internal structure of the resonant Lambda(1405) state is
investigated based on meson-baryon coupled-channels chiral dynamics,
by evaluating density distributions obtained from form factors of
the Lambda(1405) state. The form factors and the density distributions
are defined as an extension of the ordinary stable particles and
are directly evaluated from the meson-baryon scattering amplitude,
paying attention to the gauge invariance of the probe interaction.
For the resonant Lambda(1405) state we find that the resonant
Lambda(1405) state is composed of widely spread antikaon
around nucleon, which gives dominant component inside
Lambda(1405), with escaping pi Sigma component.
Also the validity of our formulation for the form factors is investigated
from a pure bound state, and it is found that the form factor in our
approach serves as a natural generalization of the form factor for
stable particles.
Primary author
Dr
Takayasu Sekihara
(Tokyo Institute of Technology)
