Vector Formfactors in Hard Pion Chiral Perturbation Theory

We use three-flavour hard pion Chiral Perturbation Theory (HPChPT) in both the heavy meson and a relativistic formulation to calculate the chiral logarithms m2 log ( m2/μ2 ) contributing to the formfactors of the B(s) → π,K, η and D(s) → π,K, η transitions at momentum transfer q2 away from the endpoint q2 max = (mB − mM ) 2. We compare our results with CLEO D → π and D → K data. We also calculate the Isgur-Wise function of theB(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 ≫ mπ. This allows us to test hard pion ChPT using the existing two-loop calculations for these quantities. PACS: 12.39.Fe Chiral Lagrangians, 13.20.He Decays of bottom mesons, 13.20.Fc Decays of charmed mesons, 11.30.Rd Chiral symmetries