Strong D* -> D+pi and B* -> B+pi couplings

Abstract

We compute g_{D* D pi} and g_{B* B pi} using a framework in which all elements are constrained by Dyson-Schwinger equation studies of QCD, and therefore incorporates a consistent, direct and simultaneous description of light- and heavy-quarks and the states they may constitute. We link these couplings with the heavy-light-meson leptonic decay constants, and thereby obtain g_{D* D pi}=15.9+2.1/-1.0 and g_{B* B pi}=30.0+3.2/-1.4. From the latter we infer \hat-g_B=0.37+0.04/-0.02. A comparison between g_{D* D pi} and g_{B* B pi} indicates that when the c-quark is a system's heaviest constituent, Lambda_{QCD}/m_c-corrections are not under good control.

5 pages, 1 table, 2 figures

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• Theoretical estimate of the $D^{\ast }\to D\pi$ decay rate
• Exciting flavored bound states
• Precision lattice QCD computation of the $B^{\ast }B\pi$ coupling
• Parametrizations of three-body hadronic $B$- and $D$-decay amplitudes in terms of analytic and unitary meson-meson form factors
• Distribution Amplitudes of Heavy Mesons and Quarkonia on the Light Front
• Effects of a dressed quark-gluon vertex in vector heavy-light mesons and theory average of B(c)* meson mass
• Measurement of the D*(2010)+ meson width and the D*(2010)+ - D0 mass difference
• Flavor SU(4) breaking between effective couplings
• Estimating Form Factors of $B_s\to D_s^{(\ast )}$ and their Applications to Semi-leptonic and Non-leptonic Decays
• Effects of a dressed quark-gluon vertex in pseudoscalar heavy-light mesons
• A combined study of the pion's static properties and form factors
• Excited hadrons and the analytical structure of bound-state interaction kernels
• Interplay of dynamical and explicit chiral symmetry breaking effects on a quark
• $B_s^{\ast }BK$ vertex from QCD sum rules
• Measurement of the D*(2010)+ natural line width and the D*(2010)+ - D0 mass difference
• Couplings between the $\rho$ and $D$- and $D^{\ast }$-mesons
• Chiral Particle Decay of Heavy-Light Mesons in a Relativistic Potential Model
• The Productions and Strong Decays of $D_q(2S)$ and $B_q(2S)$
• Nucleon Quark Distribution Functions from the Dyson-Schwinger Equations
• Light-quarkonium spectra and orbital-angular-momentum decomposition in a Bethe-Salpeter-equation approach
• Remarks on the Standard Model predictions for $R(D)$ and $R(D^{\ast })$
• The Strong Decays of $P-$wave Mixing Heavy-Light $1^{+}$ States
• The Strong Decays of X(3940) and X(4160)
• Stealth QCD-like Strong Interactions and the t-tbar Asymmetry
• Determination of the strong coupling $g_{B^{\ast }B\pi }$ from semi-leptonic $B\to \pi \ell \nu$ decay
• Strong decays of $D_J(3000)$ and $D_{sJ}(3040)$
• Looking into the matter of light-quark hadrons
• Contemporary continuum QCD approaches to excited hadrons
• The Charm and Beauty of Strong Interactions
• Spin Partners of the $B^{(\ast )}{\bar{B}}^{(\ast )}$ resonances with a different approach than the Breit-Wigner parameterization
• Heavy-meson chiral Lagrangians, effective flavored couplings, SU(4) flavor breaking and their consequences
• The Production of $X(3940)$ and $X(4160)$ in $B_c$ decays
• The newly observed state $D_{s0}(2590{)}^{+}$
• $D^{\ast }D\pi$ and $B^{\ast }B\pi$ couplings from Dyson-Schwinger equations framework
• QCD calculations of radiative heavy meson decays with subleading power corrections