Eur. Phys. J. C (2008) 54: 107-121
https://doi.org/10.1140/epjc/s10052-007-0498-x

Regular Article - Theoretical Physics

The transition form factors for semi-leptonic weak decays of J/ψ in QCD sum rules

¹ Institute of High Energy Physics, P.O. Box 918(4), Beijing, 100049, P.R. China
² Department of Physics, Nankai University, Tianjin, 300071, P.R. China

^* e-mail: lucd@ihep.ac.cn

Received: 13 July 2007
Revised: 23 November 2007
Published online: 8 January 2008

Abstract

Within the standard model, we investigate the semi-leptonic weak decays of J/ψ. The various form factors of J/ψ making the transition to a single charmed meson (D^(*) _(d,s)) are studied in the framework of QCD sum rules. These form factors fully determine the rates of the weak semi-leptonic decays of J/ψ and provide valuable information on non-perturbative QCD effects. Our results indicate that the decay rate of the semi-leptonic weak decay mode J/ψ→D^(*)- _s+e⁺+ν_e is at the order of 10^-10.