# Revisiting Charmless Hadronic B_{u,d} Decays in QCD Factorization

## TL;DR

This paper revisits charmless hadronic B meson decays within QCD factorization, exploring power corrections like penguin annihilation and soft effects to resolve CP puzzles and rate deficits, with predictions aligning well with experimental data.

## Contribution

It introduces a detailed analysis of power correction effects in QCDF to address CP and rate puzzles in B decays, comparing with pQCD and SCET approaches.

## Key findings

- Certain decay channels require penguin annihilation for correct CP violation.
- Some decays need both power corrections to match measured CP asymmetries.
- QCDF predictions agree well with experimental branching fractions and CP asymmetries.

## Abstract

Within the framework of QCD factorization (QCDF), we consider two different types of power correction effects in order to resolve the CP puzzles and rate deficit problems with penguin-dominated two-body decays of B mesons and color-suppressed tree-dominated $\pi^0\pi^0$ and $\rho^0\pi^0$ modes: penguin annihilation and soft corrections to the color-suppressed tree amplitude. We emphasize that the electroweak penguin solution to the $B\to K\pi$ CP puzzle via New Physics is irrelevant for solving the CP and rate puzzles related to tree-dominated decays. While some channels e.g. $K^-\pi^+,K^-\rho^0,\pi^+\pi^-,\rho^\pm\pi^\mp$ need penguin annihilation to induce the correct magnitudes and signs for their CP violation, some other decays such as $B^-\to K^-\pi^0,\pi^-\eta, K^-\eta$ and $\bar B^0\to \bar K^{*0}\eta,\pi^0\pi^0$ require the presence of both power corrections to account for the measured CP asymmetries. In general, QCDF predictions for the branching fractions and direct CP asymmetries of $\bar B\to PP,VP,VV$ decays are in good agreement with experiment. The predictions of pQCD and soft-collinear effective theory are included for comparison.