%0 Journal Article
%A Llanes Estrada, Felipe José
%A Guo, F.-K
%A Hanhart, C
%A Meißner, U.-G
%T When hadrons become unstable: a novel type of non-analyticity in chiral extrapolations.
%D 2011
%@ 0370-2693
%U https://hdl.handle.net/20.500.14352/43937
%X Hadron masses show a specific dependence on the quark masses. Therefore, the variation of these masses can cause a resonance in a hadronic scattering amplitude to become a bound state. Consequently, the amplitude exhibits a non analytic behavior at this transition. Crossed amplitudes, where the resonance can be exchanged in the t-channel, can be shown to exhibit the same phenomenon by s --> t analytic continuation. This entails possible kinks in lattice quark-mass extrapolations needed to compute hadronic observables.
%~