On the coupling of heavy mesons to pions in QCD

Details On the coupling of heavy mesons to pions in QCD On the coupling of heavy mesons to pions in QCD

1994-06-13

arxiv.org/abs/hep-ph/9406295v1

Phys.Lett. B339 (1994) 151-159

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, LaTeX, UGVA-DPT 1994/06-856 and BARI-TH/94-171

Scientific paper

10.1016/0370-2693(94)91148-7

We compute the strong coupling constant $g_{P^* P \pi}$, with $P$ and $P^*$ respectively pseudoscalar and vector heavy mesons by using the QCD sum rules approach. Our computation is based on the evaluation of the time ordered product of currents between the vacuum and the soft pion state. The so-called parasitic terms are taken into account and give a contribution to the sum rule of the same order of the lowest lying state, while higher dimension non perturbative terms have small numerical effects. The infinite heavy quark mass limit is also examined.

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