Abstract

We use three-flavour hard pion Chiral Perturbation Theory (HPChPT) in both the heavy meson and a relativistic formulation to calculate the chiral logarithms m 2 log ( m 2 / μ 2 ) contributing to the formfactors of the B ( s ) → π , K , η and D ( s ) → π , K , η transitions at momentum transfer q 2 away from the endpoint q max 2 = ( m B − m M ) 2 . We compare our results with CLEO D → π and D → K data. We also calculate the Isgur–Wise function of the B ( s ) → D ( s ) semileptonic decay away from the endpoint and the chiral logarithms for the pion and kaon electromagnetic formfactor. In two-flavour HPChPT we calculate the chiral logarithms for the pion vector and the scalar formfactors at s ≫ m π 2 . This allows us to test hard pion ChPT using the existing two-loop calculations for these quantities.

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