Kaonic hydrogen and K^- p scattering
  Chiral SU(3) effective field theory in combination with a relativistic coupled channels approach is used to perform a novel analysis of the strong interaction shift and width in kaonic hydrogen in view of the new accurate DEAR measurements. Questions of consistency with previous K^- p data are examined. Coulomb and isospin breaking effects turn out to be important and are both taken into account in this work. 
B. Borasoy, R. Nissler and W. Weise