Semileptonic $B(B_s, B_c)$ decays in the light-cone QCD sum rules

TL;DR

This paper systematically studies semileptonic B, B_s, and B_c decays using light-cone QCD sum rules, focusing on weak form factors and their dependence on meson distribution amplitudes, providing decay predictions.

Contribution

It introduces an effective LCSR approach with chiral current correlators to better control higher twist effects in semileptonic B decays, and models heavy meson distribution amplitudes.

Findings

Calculated weak form factors for B, B_s, B_c decays.

Estimated decay widths and branching ratios.

Provided a practical scenario for form factor behavior analysis.

Abstract

Semileptonic $B$($B_s, B_c$) decays are investigated systematically in the light-cone QCD sum rules. Special emphasis is put on the LCSR calculation on weak form factors with an adequate chiral current correlator, which turns out to be particularly effective to control the pollution by higher twist components of spectator mesons. The result for each channel depends on the distribution amplitude of the the producing meson. The leading twist distribution amplitudes of the related heavy mesons and charmonium are worked out by a model approach in the reasonable way. A practical scenario is suggested to understand the behavior of weak form factors in the whole kinematically accessible ranges. The decay widths and branching ratios are estimated for several $B$($B_c$) decay modes of current interest.