Buras Andrzej J, Fleischer Robert, Recksiegel Stefan, Schwab Felix
Physik Department, Technische Universität München, D-85748 Garching, Germany.
Phys Rev Lett. 2004 Mar 12;92(10):101804. doi: 10.1103/PhysRevLett.92.101804. Epub 2004 Mar 11.
The measured B-->pipi,piK branching ratios (BRs) exhibit puzzling patterns. We point out that the B-->pipi hierarchy can be nicely accommodated in the standard model (SM) through nonfactorizable hadronic interference effects, whereas the B-->piK system may indicate new physics (NP) in the electroweak (EW) penguin sector. Using the B-->pipi data and the SU(3) flavor symmetry, we fix the hadronic B-->piK parameters and show that any currently observed feature of the B-->piK system can be easily explained through enhanced EW penguin diagrams with a large CP-violating NP phase. This in turn implies in particular an enhancement of the K(L)-->pi(0)nunu rate by 1 order of magnitude, with BR(K(L)-->pi(0)nunu) approximately 4BR(K+-->pi(+)nunu), BR(K(L)-->pi(0)e(+)e(-))=O(10(-10)), and (sin(2beta)(pinunu)<0. We address also other rare K and B decays and B(d)-->phiK(S).
测量得到的B→ππ、πK分支比（BRs）呈现出令人困惑的模式。我们指出，通过非因子化强子干涉效应，B→ππ的层次结构可以很好地纳入标准模型（SM），而B→πK系统可能在电弱（EW）企鹅图部分暗示新物理（NP）。利用B→ππ数据和SU(3)味对称性，我们确定了强子B→πK参数，并表明B→πK系统目前观测到的任何特征都可以通过具有大CP破坏NP相位的增强EW企鹅图轻松解释。这反过来特别意味着K(L)→π(0)νν速率增强1个数量级，其中BR(K(L)→π(0)νν)约为4BR(K+→π+νν)，BR(K(L)→π(0)e+e−)=O(10−10)，且sin(2β)(πνν)<0。我们还讨论了其他罕见的K和B衰变以及B(d)→φK(S)。
