Vector Formfactors in Hard Pion Chiral Perturbation Theory.

Johan Bijnens, Ilaria Jemos

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30 Citations (SciVal)


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)/mu(2)) contributing to the formfactors of the B-(s) -> pi, K, eta and D-(s) -> pi, K, eta 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 -> pi 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(pi)(2). This allows us to test hard pion ChPT using the existing two-loop calculations for these quantities. (C) 2011 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)145-166
JournalNuclear Physics, Section B
Issue number2
Publication statusPublished - 2011

Subject classification (UKÄ)

  • Subatomic Physics


  • Chiral Perturbation Theory
  • B and D meson semileptonic decays


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