Vector Formfactors in Hard Pion Chiral Perturbation Theory
Bijnens, Johan · Jemos, Ilaria
Original · EN
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(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 q²ₘax=(mB-mₘ)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≫ mπ². This allows us to test hard pion ChPT using the existing two-loop calculations for these quantities.
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