Relativistic corrections to the axial vector and vector currents in the b̄c meson system at order αs

Jungil Lee, Wenlong Sang, Seyong Kim

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6 Citations (Scopus)


We compute the short distance coefficients for the NRQCD factorization formulas of the meson-to-vacuum matrix elements for the axial vector and vector parts of the charged weak current in the S-wave spin-singlet and-triplet b̄c mesons, respectively. The computation is carried out to order αs including relativistic corrections of all orders in q 2n, where q is the relative momentum of the b̄ and c in the meson rest frame. The relativistic corrections at order αs are new. The results reveal that the relativistic corrections to the leptonic decay rate of the Bc meson at order αs or less converge rapidly which shows a strong contrast to the uncomfortably large corrections of order α2 s|q|0. The short distance coefficients listed in this paper can be employed to compute the resummation of relativistic corrections to the phenomenological measurables that involve B c and B* c production and decay.

Original languageEnglish
Article number113
JournalJournal of High Energy Physics
Issue number1
Publication statusPublished - 2011 Sep 28



  • Heavy quark physics
  • QCD

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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