Revisiting the B {\to} {\pi} {\rho}, {\pi} {\omega} Decays in the Perturbative QCD Approach Beyond the Leading Order

TL;DR

This paper improves theoretical predictions of B meson decays into pions and rho or omega mesons by including next-to-leading-order corrections in perturbative QCD, resulting in better agreement with experimental data.

Contribution

It provides the first comprehensive calculation of B to pi rho and pi omega decays at NLO in perturbative QCD, enhancing accuracy over previous LO results.

Findings

NLO corrections significantly increase certain branching ratios.

Predictions for CP asymmetries align better with experimental data.

Theoretical results show improved consistency with observed decay patterns.

Abstract

We calculate the branching ratios and CP asymmetries of the $B \to \pi \rho$, $\pi\omega $ 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 $B^0\rightarrow \pi^0\rho^0$ 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.