Rescattering effects in charmless decays

✍ Scribed by Chun-Khiang Chua

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 358 KB
• Volume: 844
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2010.05.047

✦ Synopsis

Final-state interaction effects in charmless B u,d,s → P P decays are studied. Our main results are as follows: (i) Theoretical results are in agreement with data in the presence of FSI. (ii) The B → π + π -and π 0 π 0 decay rates are suppressed and enhanced respectively by FSI. (iii) The FSI has large impact on direct CP asymmetries (A) of many modes. (iv) The deviation(ΔA) between A(B 0 → K -π + ) and A(B -→ K -π 0 ) can be understood in the FSI approach. (v) Sizable and complex color-suppressed tree amplitudes, which are crucial for the large π 0 π 0 rate and ΔA, are generated through exchange rescattering. (vi) The B -→ π -π 0 direct CP violation is very small and is not affected by FSI. (vii) Several B s decay rates are enhanced. (viii) Time-dependent CP asymmetries S in B d,s decays are studied. The ΔS(B 0 → K S η ) is very small (≤ 1%). We found that the asymmetries |S| for B 0 s → ηη, ηη and η η decays are all below 0.06.