Possible explanation of the discrepancy of the light-cone QCD sum rule calculation of gD*Dπ coupling with experiment

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Published 21 January 2003 • Published under licence by IOP Publishing Ltd
, , Citation Damir Becirevic et al JHEP01(2003)009 DOI 10.1088/1126-6708/2003/01/009

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1 Dip. di Fisica, Università di Roma ``La Sapienza", Piazzale Aldo Moro 2, I-00185 Rome, Italy

2 Centre de Physique Théorique, CNRS Luminy, Case 907, F-13288 Marseille Cedex 9, France

3 Université de Paris Sud, Centre d'Orsay, LPT (Bât.210), F-91405 Orsay Cedex, France

Dates

  1. Received 18 December 2002
  2. Accepted 7 January 2003
  3. Published

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1126-6708/2003/01/009

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 Rückl, can explain the large experimental value of gD*Dπ, recently measured by CLEO. At the same time, it considerably improves the stability of the sum rule when varying the Borel parameter M2.

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10.1088/1126-6708/2003/01/009