Use and misuse of ChPT in the heavy-light systems

Details Use and misuse of ChPT in the heavy-light systems Use and misuse of ChPT in the heavy-light systems

2007-10-18

arxiv.org/abs/0710.3496v1

PoSLAT2007:063,2007

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, contribution to the proceedings of "Lattice 2007"

Scientific paper

We discuss the range of validity of ChPT 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 B-Bbar mixing amplitude and examined the impact of nearness of the positive parity 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.

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