1201.6549 (Yoichi Ikeda et al.)

Chiral SU(3) theory of antikaon-nucleon interactions with improved
threshold constraints    [PDF]

Yoichi Ikeda, Tetsuo Hyodo, Wolfram Weise

$\bar{K}$-nucleon interactions are investigated in the framework of
coupled-channels dynamics based on the next-to-leading order chiral SU(3)
meson-baryon effective Lagrangian. A recent determination of the 1s shift and
width of kaonic hydrogen enables us to set accurate constraints on the
coupled-channels meson-baryon amplitudes in the strangeness $S=-1$ sector.
Theoretical uncertainties in the subthreshold extrapolation of the
coupled-channels amplitudes are discussed. Using this framework, we give
predictions for $K^-$-neutron interactions and for the spectrum of the
$\Lambda(1405)$ resonance. A simplified, effective three-channel model using
leading order chiral SU(3) meson-baryon interactions is also constructed for
convenient application in $\bar{K}$-nuclear few-body calculations.

View original: http://arxiv.org/abs/1201.6549