出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We discuss the range of validity of chiral perturbation theory when applied to the systems of
heavy-light mesons. Having in mind the recent experimental evidence according to which the
heavy-light scalar and axial states are closer to the ground states than anticipated, we revisited
the prediction for the chiral behavior of the B0q
−B0q
mixing amplitude and examined the impact
of nearness of the (1/2)+ states. We conclude that the standard ChPT expressions with NF = 3
light flavours are not useful in guiding the extrapolation of hadronic quantities computed on the
lattice. Instead those derived in HMChPT with NF = 2, i.e., including only the pion loops, are
still adequate as long as they are applied to the pions lighter than 350 MeV, or the quarks lighter
than a third of the physical strange quark mass.
