Measurements of CKM angles β/φ1 and α/φ2 at the BABAR and Belle experiments
نویسنده
چکیده
CP violation in the Standard Model (SM) [1] is described by an irreducible complex phase in the Cabibbo-Kobayashi-Maskawa (CKM) quark-mixing 3 × 3 matrix [2]. The equation VudV ⋆ ub + VcdV ⋆ cb + VtdV ⋆ tb = 0, which follows from the unitarity of the CKM matrix V , can be depicted as a triangle – called the Unitarity Triangle (UT) – in the complex plane [3]. The main goal of the B-factories is to verify the SM picture of the origin of the CP violation by measuring the angles (denoted by α, β, and γ ) and the sides of the UT in B decays. In this review we report results obtained by the BABAR and Belle collaborations concerning the measurements of the angles α and β.
منابع مشابه
Measurement of the CKM Angles at BaBar and Belle
The primary goal of the BaBar and Belle experiments is to overconstrain the CKM Unitarity Triangle. Measurements of the angles of this triangle, known as β, α, and γ (or φ1, φ2, and φ3) give insight into the Standard Model description of CP violation in the quark sector. BaBar and Belle have recorded almost 1 ab−1 combined, and have measured β to high precision. Measurements of α and γ are less...
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The Standard Model predicts CP violation to occur in B meson decays due to a complex phase in the 3×3 Cabibbo-Kobayashi-Maskawa (CKM) mixing matrix. This phase is illustrated by plotting the unitarity condition V ∗ ubVud + V ∗ cbVcd + V ∗ tbVtd = 0 as vectors in the complex plane: the phase results in a triangle of nonzero height. One interior angle of the triangle, denoted φ1 or β, is determin...
متن کاملar X iv : h ep - e x / 04 10 02 5 v 2 2 9 O ct 2 00 4 UCHEP - 04 - 01 Constraints upon the CKM angle φ 2 from Belle and
The Standard Model predicts CP violation to occur in B meson decays owing to a complex phase in the 3×3 Cabibbo-Kobayashi-Maskawa (CKM) mixing matrix. This phase is illustrated by plotting the unitarity condition V ∗ ubVud + V ∗ cbVcd + V ∗ tbVtd = 0 as vectors in the complex plane: the phase results in a triangle of nonzero height. One interior angle of the triangle, denoted φ1 or β, is determ...
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