Determination of ? and - 2 ß s from charmless two-body decays of beauty mesons
Determination of ? and - 2 ß s from charmless two-body decays of beauty mesons
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的测定？
DOI：
10.1016/j.physletb.2014.12.015
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发表时间：
2015
影响因子：
4.4
通讯作者：
Aaij R
中科院分区：
文献类型：
--
作者：
Aaij R
利用在B S 0→K+K−衰变中含时CP破坏的最新LHCB测量，建立了B S 0→K+K−和B 0→π+π−衰变过程的衰变幅度之间的U自旋关系，允许对么正三角形的角度γ和B S 0混合相−2βS施加约束。还给出了一种扩展方法的结果，该方法使用了来自其他实验的附加输入并利用同位旋对称性对B 0→π0π0和B+→π+π0衰变进行了输入。研究了结果与U-自旋最大允许破碎量的关系。在68%的概率下，确定了γ=(63.5−6.7+7.2)°模180°的值。在另一种分析中，找到了值−2βS=−0.12−0.16+0.14 rad。在这两个测量中，都包括了高达50%的U-自旋破裂效应的不确定度。
Using the latest LHCb measurements of time-dependent CP violation in the B s 0→ K+ K− decay, a U-spin relation between the decay amplitudes of B s 0→ K+ K− and B 0→ π+ π− decay processes allows constraints to be placed on the angle γ of the unitarity triangle and on the B s 0 mixing phase− 2 β s. Results from an extended approach, which uses additional inputs on B 0→ π 0 π 0 and B+→ π+ π 0 decays from other experiments and exploits isospin symmetry, are also presented. The dependence of the results on the maximum allowed amount of U-spin breaking is studied. At 68% probability, the value γ=(63.5− 6.7+ 7.2)° modulo 180° is determined. In an alternative analysis, the value− 2 β s=− 0.12− 0.16+ 0.14 rad is found. In both measurements, the uncertainties due to U-spin breaking effects up to 50% are included.