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

Abstract

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.

arXiv comment9 pages, 1 PostScript figures

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Cited by in corpus (21)

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• g(B*Bpi)-coupling in the static heavy quark limit
• Analysis of the vertices D^*D^* P, D^*D V and DDV with light-cone QCD sum rules
• Lattice measurement of the couplings g_infinity and g_Bstar_B_pi
• Measurement of the $D^0\to {\pi }^{-}{e}^{+}{\nu }_e$ differential decay branching fraction as a function of $q^2$ and study of form factor parameterizations
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• The $D^{\ast }D\pi$ and $B^{\ast }B\pi$ couplings from light-cone sum rules
• Analysis of the vertices $DDV$ and $D^{\ast }DV$ with light-cone QCD sum rules
• Soft Photon Problem in Leptonic B-decays
• Strong decay of the heavy tensor mesons with QCD sum rules
• Parametrisations of the D -> K l nu form factor and the determination of \hat{g}
• Lattice QCD study of the elastic and transition form factors of charmed baryons
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• Determination of the strong coupling $g_{B^{\ast }B\pi }$ from semi-leptonic $B\to \pi \ell \nu$ decay
• On the B*' --> B transition
• All possible first signals of gauge leptoquark in quark-lepton unification and beyond
• $D^{\ast }D\rho$ and $B^{\ast }B\rho$ strong couplings in light-cone sum rules
• An improved calculation of the $D_{(s)}^{\ast }{D}_{(s)}V$ and $B_{(s)}^{\ast }{B}_{(s)}V$ couplings from light-cone sum rules