Non-factorizable contributions in B decays revisited

TL;DR

This paper revisits B meson two-body decays by analyzing factorizable and non-factorizable contributions, finding that non-factorizable effects are small but significant in certain decay modes.

Contribution

It introduces a method to estimate non-factorizable contributions using a hard pion approximation in the infinite momentum frame.

Findings

Non-factorizable contributions are small in color favored decays.

Non-factorizable effects are more significant in color mismatched decays.

The approach provides a quantitative estimate of non-factorizable effects.

Abstract

Two-body decays of B mesons are studied by decomposing their amplitude into a sum of factorizable and non-factorizable ones. The former is estimated by using the naive factorization while the latter is calculated by using a hard pion (or kaon) approximation in the infinite momentum frame. It is seen that the non-factorizable contribution is small but not negligible in color favored decays while it is more important in color mismatched decays.