1/m_Q corrections in heavy meson decays

Abstract

We study the form factor f_+^H (H=D,B) involved in H-πtransitions. We use data on D^0 \to π^- l^+ νto find f_+^D at low recoil. Then we use perturbative QCD methods to calculate at larger recoil the contributions to f_+^H that break heavy quark symmetry (HQS). Using HQS relations we obtain an estimate of f_+^B which includes first order corrections in 1/(2m_Q). Comparison with recent data on B^0 \to π^- l^+ νgives V_ub = 0.0025 \pm 0.0005^ex \pm 0.0004^th.

13 pages, 3 figures, corrected version

References in corpus (9)

• $D^{\ast }D\pi$ and $B^{\ast }B\pi$ couplings in QCD
• Extraction of $V_{ub}$ from the Decay $B\to \pi l\nu$
• Sudakov Form Factors
• Effective Lagrangian for Heavy and Light Mesons: Semileptonic Decays
• The Semileptonic Decays $D\to \pi (\rho )e\nu$ and $B\to \pi (\rho )e\nu$ from QCD Sum Rules
• On the coupling of heavy mesons to pions in QCD
• The Decay $B\to \pi \ell \nu$ in Heavy Quark Effective Theory
• Form Factors in the Heavy Quark and Chiral Limit: Pole dominance in $\bar{B}\to \pi e{\bar{\nu }}_e$
• Determination of Vts from D -> K* l nu and B -> K* gamma data via heavy quark symmetry and perturbative QCD

Cited by in corpus (1)

• Constraints on B--->pi,K transition form factors from exclusive semileptonic D-meson decays