$B \to ππ$ decays: branching ratios and CP asymmetries

Details $B \to ππ$ decays: branching ratios and CP asymmetries $B \to ππ$ decays: branching ratios and CP asymmetries

2006-03-02

arxiv.org/abs/hep-ph/0603013v4

Phys.Atom.Nucl.70:712-721,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

Analysis of direct CPV asymmetries is expanded; the relation with that in $K\pi$ decays is discussed. Submitted to Yad. Fiz

Scientific paper

10.1134/S1063778807040138

Theoretically motivated smallness of the penguin amplitude in $B \to \pi \pi$
decays allowes to calculate the value of the unitarity triangle angle $\alpha
(\phi_2)$ with good accuracy. The relatively large branching ratio of the decay
into $\pi^0 \pi^0$ is explained by the large value of FSI phase difference
between $\Delta I = 1/2$ and $\Delta I = 3/2$ tree amplitudes.

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