B -> pi pi decays

Abstract

The branching ratios and CP asymmetries of $B\to \pi \pi$ decays measured in B factory experiments indicate a large ratio of color-suppressed ($C$) to color-allowed ($T$) tree contributions and a large relative phase between the tree and penguin amplitude. In this talk, I would like to report on a recent analysis to see whether the large $C/T$ ratio can be explained within the QCD based model with i) a large contribution from the annihilation terms or with ii) large final-state-interaction phase between two different isospin amplitudes. We show that the current experimental data do not exclude either possibility but we may be able to distinguish these two effects in future measurements of direct CP asymmetry in $B\to {\pi }^0{\pi }^0$ decay.

Talk given at the First Workshop On Theory, Phenomenology And Experiments In Heavy Flavor, Anacapri, Italy, May 29-31, 2006, 9 pages,10 figures, to appear in the Proceedings

References in corpus (9)

• Final State Interactions in Hadronic B Decays
• Heavy-to-light B meson form factors at large recoil energy -- spectator-scattering corrections
• Large electroweak penguin contribution in B -> K pi and pi pi decay modes
• Weak phases from the $B\to \pi \pi$, $K\pi$ decays
• Reducing the Error on alpha in B-> pi pi, rho rho, rho pi
• Charmless Final State Interaction in B-> pi pi decays
• Strong Phases in the Decays B to pi pi
• Combining Information from $B\to \pi \pi$ and $B\to \pi \rho ,\pi \omega$ Decays
• Model-independent Constraints on the Weak Phase $\alpha$ (or ${\varphi }_2$) and QCD Penguin Pollution in $B\to \pi \pi$ Decays