Eur. Phys. J. C (2009) 60: 63-71
https://doi.org/10.1140/epjc/s10052-008-0855-4

Regular Article - Theoretical Physics

Heavy-to-light transition form factors and their relations in light-cone QCD sum rules

¹ Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
² Theoretical Physics Center for Science Facilities, Chinese Academy of Sciences, Beijing, 100049, China
³ Department of Physics, Yantai University, Yantai, 264005, China

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

Received: 31 August 2008
Published online: 9 January 2009

Abstract

The light-cone QCD sum rules approach improved by using the chiral current correlator is systematically reviewed and applied to the calculation of all the heavy-to-light form factors, including all the semileptonic and penguin ones. By choosing suitable chiral currents, the light-cone sum rules for all the form factors are greatly simplified and depend mainly on one leading-twist distribution amplitude of the light meson. As a result, relations between these form factors arise naturally. At the considered accuracy, these relations reproduce the results obtained in the literature. Moreover, since the explicit dependence on the leading-twist distribution amplitudes is preserved, these relations may be more useful to simulate the experimental data and extract information on the distribution amplitude.