QCD in hadronic B decays

TL;DR

This paper applies the perturbative QCD approach with $k_T$ factorization and Sudakov form factors to calculate branching ratios and CP asymmetries in charmless and charmed B decays, showing good agreement with experimental data.

Contribution

It demonstrates the effectiveness of the $k_T$ factorization approach with Sudakov form factors in predicting B decay observables.

Findings

Accurate predictions of branching ratios for $B o \pi\pi$ decays.

Consistent CP asymmetry parameters with experimental results.

Agreement with experimental data for $B o D\pi$ decays.

Abstract

The perturbative QCD approach is based on $k_T$ factorization, including the Sudakov form factors so that to avoid the endpoint singularity. In this approach, we calculate the charmless B decays like $B\to \pi\pi$ decays etc. to produce the right number of branching ratios and also CP asymmetry parameters. For final states with at least one charmed meson, like $B\to D\pi$ decays, our results also agree with the experiments.