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arXiv · hep-ph/9506207

Strong coupling of excited heavy mesons

P. Colangelo·F. De Fazio·N. Di Bartolomeo·R. Gatto·G. Nardulli
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Abstract

We compute the strong coupling constant $G_{B^{**} B π} \; (G_{D^{**} D π})$, where $B^{**}$ ($D^{**}$) is the $0^+$ $P-$wave $b \bar q \; (c \bar q)$ state, by QCD sum rules and by light-cone sum rules. The two methods give compatible results in the limit $m_Q \to \infty$, with a rather large value of the coupling constant. We apply the results to the calculation of the hadronic widths of the positive parity $B$ and $D$ states and to the chiral loop contribution to the ratio $f_{D_s}/f_D$.

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P. Colangelo, F. De Fazio, N. Di Bartolomeo, R. Gatto, G. Nardulli. 1995-06-01. Strong coupling of excited heavy mesons. https://doi.org/10.1103/physrevd.52.6422

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