Possible explanation of the discrepancy of the light-cone QCD sum rule calculation of g(D*Dpi) coupling with experiment

D. Becirevic , Jérôme Charles (1, 2) , A. Leyaouanc , L. Oliver , O. Pene , J. C. Raynal

1 CPT - Centre de Physique Théorique - UMR 6207
2 CPT - Centre de Physique Théorique - UMR 7332

The introduction of an explicit negative radial excitation contribution in the hadronic side of the light cone QCD sum rule (LCSR) of Belyaev, Braun, Khodjamirian and Ruckl, can explain the large experimental value of g(D*Dpi), recently measured by CLEO. At the same time, it considerably improves the stability of the sum rule when varying the Borel parameter.

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]

D. Becirevic, Jérôme Charles, A. Leyaouanc, L. Oliver, O. Pene, et al.. Possible explanation of the discrepancy of the light-cone QCD sum rule calculation of g(D*Dpi) coupling with experiment. Journal of High Energy Physics, 2003, 0301, pp.009. ⟨hal-00005236⟩