Constraints on the CKM Angle $γ$ and Strong Phases from $B\toπK$ Decays
| dc.creator | Buras, Andrzej J. | |
| dc.creator | Fleischer, Robert | |
| dc.date | 2000-03-31 | |
| dc.date.accessioned | 2026-07-07T10:32:38Z | |
| dc.date.available | 2026-07-07T10:32:38Z | |
| dc.description | As we pointed out recently, the neutral decays $B_d\toπ^\mp K^\pm$ and $B_d\toπ^0K$ may provide non-trivial bounds on the CKM angle $γ$. In this paper, we reconsider this approach in the light of recent CLEO data, which look very interesting. In particular, the results for the corresponding CP-averaged branching ratios are in favour of strong constraints on $γ$, where the second quadrant is preferred. Such a situation would be in conflict with the standard analysis of the unitarity triangle. Moreover, constraints on a CP-conserving strong phase $δ_n$ are in favour of a negative value of $\cosδ_n$, which would be in conflict with the factorization expectation. In addition, there seems to be an interesting discrepancy with the bounds that are implied by the charged $B\toπK$ system: whereas these decays favour a range for $γ$ that is similar to that of the neutral modes, they point towards a positive value of $\cosδ_c$, which would be in conflict with the expectation of equal signs for $\cosδ_n$ and $\cosδ_c$. If future data should confirm this ``puzzle'', it may be an indication for new-physics contributions to the electroweak penguin sector, or a manifestation of large non-factorizable SU(3)-breaking effects. | |
| dc.description | 18 pages, LaTeX, 8 figures | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0003323 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0003323 | |
| dc.identifier | Eur.Phys.J.C16:97-104,2000 | |
| dc.identifier | doi:10.1007/s100520050006 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/178821 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Constraints on the CKM Angle $γ$ and Strong Phases from $B\toπK$ Decays | |
| dc.type | text |