v 1 2 3 Fe b 20 07 Measurement of sin 2 β in tree - dominated B 0 - decays and ambiguity removal
نویسنده
چکیده
The most recent results from the B-factories on the time-dependent CP asymmetries measured in B 0-decays mediated by b → c¯ cs quark-transitions are reviewed. The Standard Model interpretation of the results in terms of the parameter sin 2β leads to a four-fold ambiguity on the unitarity triangle β which can be reduced to a twofold ambiguity by measuring the sign of the parameter cos 2β. The results on cos 2β obtained so far are reviewed.
منابع مشابه
Measurement of sin 2β in Tree Dominated B0 Decays and Ambiguity Removal
The most recent results from the B-factories on the time-dependent CP asymmetries measured in B -decays mediated by b → cc̄s quark-transitions are reviewed. The Standard Model interpretation of the results in terms of the parameter sin 2β leads to a four-fold ambiguity on the unitarity triangle β which can be reduced to a two-fold ambiguity by measuring the sign of the parameter cos 2β. The resu...
متن کاملCorrelated Bounds on Cp Asymmetries in B 0 → Η ′
Measurements of time-dependent CP asymmetries in b→ cc̄s decays including B → J/ψKS [1] are interpreted in the Standard Model as sin 2β sin∆mt, where β ≡ arg(−VtbV ∗ tdVcdV ∗ cb). These measurements have provided a crucial test [2] of the Kobayashi-Maskawa mechanism [3]. This test is theoretically clean because a single weak phase arg(V ∗ cbVcs) dominates B → J/ψKS within a fraction of a percent...
متن کاملCP Violation in B → ρπ : New Physics Signals
A Dalitz-plot analysis of B d(t) → ρπ → πππ decays allows one to obtain the CP-violating phase α. In addition, one can extract the various tree (T ) and penguin (P ) amplitudes contributing to these decays. By comparing the measured value of |P/T | with the theoretical prediction, one can detect the presence of physics beyond the standard model. [email protected] [email protected]....
متن کاملOn determining CKM angles α and β
Because the B d → J/ψK S asymmetry determines only sin 2β, a discrete ambiguity in the true value of β remains. This note reviews how the ambiguity can be removed. Extractions of the CKM angle α are discussed next. Some of the methods require very large data samples and will not be feasible in the near future. In the near future, semi-inclusive CP-violating searches could be undertaken, which a...
متن کاملUsing the value of β to help determine γ from B decays
It has been pointed out by Gronau and Rosner that the angle γ of the unitarity triangle could be determined by combining future results on Bs and Bd decays to Kπ. Here we show that it is important to include in the analysis the information on the phase β which will be determined in the near future. Omitting this information could lead to an error as large as 8 in γ. E-mail:[email protected]...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2007