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arXiv · 1012.5034

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

Bruno El-Bennich·Mikhail A. Ivanov·Craig D. Roberts
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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.

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Bruno El-Bennich, Mikhail A. Ivanov, Craig D. Roberts. 2010-12-22. Strong D* -> D+pi and B* -> B+pi couplings. https://doi.org/10.1103/physrevc.83.025205

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