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Towards a lattice determination of the $B^\ast B π$ coupling

Research output: Contribution to journalArticle

  • G. de divitiis
  • L. Del Debbio
  • M. Di Pierro
  • J. flynn
  • C. Michael
  • J. Peisa
  • UKQCD Collaboration

Related Edinburgh Organisations

Original languageUndefined/Unknown
Pages (from-to)23
Number of pages1
JournalJournal of High Energy Physics
Publication statusPublished - 20 Jul 1998


The coupling $g_{B^\ast B \pi}$ is related to the form factor at zero momentum of the axial current between $B^\ast$- and $B$-states. This form factor is evaluated on the lattice using static heavy quarks and light quark propagators determined by a stochastic inversion of the fermionic bilinear. The $\gBBP$ coupling is related to the coupling $g$ between heavy mesons and low-momentum pions in the effective heavy meson chiral lagrangian. The coupling of the effective theory can therefore be computed by numerical simulations. We find the value $g = 0.42(4)(8)$. Besides its theoretical interest, the phenomenological implications of such a determination are discussed.

    Research areas

  • Lattice gauge field theories, B-Physics

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