Final state rescattering effect on B(d) ---> pi pi decays and CP violation

The significance of final-state interactions in B_d-->\pi\pi decays is phenomenologically demonstrated by taking elastic \pi\pi--\pi\pi and inelastic \pi\pi--D\bar{D} rescattering effects into consideration. We find that the present experimental data on B^0_d-->\pi^+\pi^- can well be understood in this approach without fine-tuning of the input parameters, and large CP-violating asymmetries are expected to manifest themselves in such charmless rare processes.

B: hadronic decay
final-state interaction
pi pi: elastic scattering
pi pi: inelastic scattering
CP: violation
amplitude analysis
B: branching ratio
factorization: approximation
numerical calculations: interpretation of experiments
B0 --> 2pi

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