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

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

2010-12-22

arxiv.org/abs/1012.5034v1

Phys.Rev.C83:025205,2011

Physics

Nuclear Physics

Nuclear Theory

5 pages, 1 table, 2 figures

Scientific paper

10.1103/PhysRevC.83.025205

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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