CKM矩阵的SCAN方法全局拟合
Global Fits of the CKM Matrix with the SCAN Method
摘要：
我们使用CKM矩阵元素的最新输入测量值，sin 2 β，B 0（s，d）混合，α（K），α和γ，对rho bar - eta bar平面的允许区域进行了扫描方法分析。在这种方法中，我们没有假设的理论不确定性的分布，而是，我们扫描的范围内合理的理论不确定性，并确定在rho bar eta bar平面的置信水平轮廓。我们从B衰变到所有轻赝标-赝标、赝标-矢量、矢量-矢量和a1-赝标介子的分支分数和CP不对称性测量确定α，并从D（*）K（*）、D（*）π和D ρ模确定γ，从而包括幺正三角形角度之间的相关性。我们用色允许树、色抑制树、胶子企鹅、单线态企鹅、电弱企鹅以及W-交换和W-湮灭振幅来参数化各个衰变振幅。我们的程序考虑了拟合CKM参数（rho bar，eta bar，A，lambda）之间的所有相关性。数据与标准模型一致，不需要新的物理贡献。我们还研究了示例“墙图”，即，敏感参数的投影，显示它们之间的相关性和首选理论参数的区域。
英文摘要：
We present a Scan Method analysis of the allowed region of the rho bar - eta bar plane using the latest input measurements of the CKM matrix elements, sin 2 beta, B0(s,d) mixing, epsilon(K), alpha and gamma. In this approach, we make no assumptions as to the distribution of theory uncertainties; rather, we scan over the range of plausible theoretical uncertainties and determine confidence level contours in the rho bar eta bar plane. We determine alpha from branching fraction and CP asymmetry measurements of B decays to all light pseudoscalar-pseudoscalar, pesudoscalar-vector, vector-vector and a1-psudoscalar mesons and determine gamma from D(*)K(*), D(*) pi and D rho modes, thereby including correlations between the angles of the unitarity triangle. We parametrize the individual decay amplitudes in terms of color-allowed tree, color-suppressed tree, gluonic penguin, singlet penguin, electroweak penguin, as well as W-exchange and W-annihilation amplitudes. Our procedure accounts for all correlations among the fitted CKM parameters (rho bar, eta bar, A, lambda). The data are consistent with the Standard Model with no need for new physics contributions. We also examine example "wall plots", i.e., projections of sensitive parameters showing correlations among them and regions of preferred theoretical parameters.
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