Re-analysis of the $D^* Dπ$ coupling in the light-cone QCD sum rules

Details Re-analysis of the $D^* Dπ$ coupling in the light-cone QCD sum rules Re-analysis of the $D^* Dπ$ coupling in the light-cone QCD sum rules

2002-06-19

arxiv.org/abs/hep-ph/0206170v2

J.KoreanPhys.Soc.42:475-478,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages including 1 postscript figure

Scientific paper

The recent measurement from the CLEO experiment presents the $DD^*\pi$ coupling, $17.9\pm 0.3 \pm 1.9$. This value is much larger than any of QCD sum rule predictions available in literature. We report that, with a relevant treatment of the continuum subtraction as well as with the asymptotic form of the twist-2 pion wave function, the light-cone QCD sum rule can provide the coupling comparable to the experimental value. The stability of the resulting sum rule becomes much better with these corrections.

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