Nonleptonic two-body charmless B decays involving a tensor meson in the Perturbative QCD Approach

TL;DR

This paper investigates charmless B meson decays involving tensor mesons using perturbative QCD, providing predictions for branching ratios and CP asymmetries that align with recent experiments and highlight the importance of nonfactorizable contributions.

Contribution

It offers the first detailed perturbative QCD calculations for these decays, including tensor meson mixing effects and CP asymmetry predictions, surpassing previous models in accuracy.

Findings

Branching ratios for certain decays are of order 10^{-6} to 10^{-5}.

Predicted branching ratios are larger than previous models but match experimental data.

Some direct CP asymmetries are large enough for future experimental detection.

Abstract

Two-body charmless hadronic B decays involving a light tensor meson in the final states are studied in the perturbative QCD approach based on $k_T$ factorization. From our calculations, we find that the decay branching ratios for color allowed tree-dominated decays $B\to a_{2}^{0}\pi^{+}$ and $B\to a_{2}^{-}\pi^{+}$ modes are of order $10^{-6}$ and $10^{-5}$, respectively. While other color suppressed tree-dominated decays have very small branching ratios. In general, the branching ratios of most decays are in the range of $10^{-5}$ to $10^{-8}$, which are bigger by one or two orders of magnitude than those predictions obtained in Isgur-Scora-Grinstein-Wise II model and in the covariant light-front approach, but consistent with the recent experimental measurements and the QCD factorization calculations. Since the decays with a tensor meson emitted from vacuum are prohibited in naive factorization, the contributions of nonfactorizable and annihilation diagrams are very important to these decays, which are calculable in our perturbative QCD approach. We also give predictions to the direct CP asymmetries, some of which are large enough for the future experiments to measure. Because we considered the mixing between $f_{2}$ and $f_{2}'$, the decay rates are enhanced significantly for some decays involving $f_{2}^{\prime}$ meson, even with a small mixing angle.