Nonfactorizable Effects in Exclusive Charmless B Decays
| dc.creator | Cheng, Hai-Yang | |
| dc.creator | Tseng, B. | |
| dc.date | 1997-08-01 | |
| dc.date.accessioned | 2026-07-07T04:02:11Z | |
| dc.date.available | 2026-07-07T04:02:11Z | |
| dc.description | Nonfactorizable effects in charmless $B\to PP, VP$ decays can be lumped into the effective parameters a_i that are linear combinations of Wilson coefficients, or equivalently absorbed into the effective number of colors N_c. Naive factorization with N_c=3 fails to explain the CLEO data of $B^\pm \to ωK^\pm$, showing the first evidence for the importance of nonfactorizable contributions to the penguin amplitude. The decays $B^\pm \to ωπ^\pm$ dominated by tree amplitudes are sensitive to the interference between external and internal W-emission diagrams. Destructive interference implied by $N_c=\infty$ leads to a prediction of ${\cal B}(B^\pm \to ωπ^\pm)$ which is about $2σ$ too small compared to experiment. Therefore, the CLEO data of $B^\pm \to ωK^\pm, ωπ^\pm$ suffice to rule out N_c=3 and strongly disfavor $N_c=\infty$ for rare charmless B decays. Factorization based on $N_c\approx 2$ can accommodate the data of $B^\pm \to ωK^\pm$, but it predicts a slightly smaller branching ratio of $B^\pm \to ωπ^\pm$ with ${\cal B}(B^\pm \to ωπ^\pm)/{\cal B} (B^\pm \to ωK^\pm)=0.6$. We briefly explain why the 1/N_c expansion is still applicable to the B meson decay once the correct large-N_c counting rule for the Wilson coefficient c_2(m_b) is applied. | |
| dc.description | 12 pages, 3 figures included | |
| dc.identifier | https://arxiv.org/abs/hep-ph/9708211 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/9708211 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/47125 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Nonfactorizable Effects in Exclusive Charmless B Decays | |
| dc.type | text |