Eur. Phys. J. C (2012) 72: 1923
https://doi.org/10.1140/epjc/s10052-012-1923-3

Regular Article - Theoretical Physics

Revisiting the B→πρ, πω decays in the perturbative QCD approach beyond the leading order

Institute of High Energy Physics and Theoretical Physics Center for Science Facilities, Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China

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

Received: 7 November 2011
Revised: 26 February 2012
Published online: 14 March 2012

Abstract

We calculate the branching ratios and CP asymmetries of the B→πρ, πω decays in the perturbative QCD factorization approach up to the next-to-leading-order contributions. We find that the next-to-leading-order contributions can interfere with the leading-order part constructively or destructively for different decay modes. Our numerical results have a much better agreement with current available data than previous leading-order calculations, e.g., the next-to-leading-order corrections enhance the B ⁰→π ⁰ ρ ⁰ branching ratios by a factor 2.5, which is helpful to narrow the gaps between theoretic predictions and experimental data. We also update the direct CP-violation parameters, the mixing-induced CP-violation parameters of these modes, which show a better agreement with experimental data than many of the other approaches.