$B\to ππ, K π$ Decays in QCD Improved Factorization Approach

Details $B\to ππ, K π$ Decays in QCD Improved Factorization Approach $B\to ππ, K π$ Decays in QCD Improved Factorization Approach

2000-06-02

arxiv.org/abs/hep-ph/0006022v2

Phys.Rev. D62 (2000) 094020

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, latex, 2 figures, version to appear in PRD

Scientific paper

10.1103/PhysRevD.62.094020

Motivated by recent measurements, we investigate $B\to \pi \pi, K \pi$ decay modes in the framework of QCD improved factorization, which was recently proposed by Beneke $et al$. We find that all the measured branching ratios are well accommodated in the reasonable parameter space except for $B\to K^0 \pi^0 $. We also discuss in detail the strong penguin contributions and the ${\cal O}(\alpha_s)$ corrections to the chirally enhanced terms. We find that the weak phase $\gamma$ lies in the region $120^{\circ}<\gamma<240^{\circ}$, which is mainly constrained by $B\to \pi^- \pi^+ $.

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