Improved constraints on chiral SU(3) dynamics from kaonic hydrogen
  A new improved study of K^- - proton interactions near threshold is performed using coupled-channels dynamics based on the next-to-leading order chiral SU(3) meson-baryon effective Lagrangian. Accurate constraints are now provided by new high-precision kaonic hydrogen measurements. Together with threshold branching ratios and scattering data, these constraints permit an updated analysis of the complex barK N and pi Sigma coupled-channels amplitudes and an improved determination of the K^- p scattering length, including uncertainty estimates. 
Yoichi Ikeda (Tokyo Inst. Tech.), Tetsuo Hyodo (Tokyo Inst. Tech),   Wolfram Weise (Munich, Tech. U.)
nucl-th hep-ph nucl-ex