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Use and Misuse of Chiral Perturbation Theory for Lattice QCD

Presenter: Damir Becirevic — Laboratoire de Physique Theorique, Universite Paris Sud, France

D.Becirevic, S.Fajfer, J.Kamenik

The use of predictions made by chiral perturbation theory describing the light quark dynamics in the heavy-light systems in the lattice study has become problematic since the experimental evidence of the nearness of the excited states. We discuss the corresponding consequences on the example of the Bs,d0-Bs,d0 mixing amplitudes. We also recall the actual problems related to the use of ChPT in describing the light hadron dynamics.