Constraints on new physics in $B-\bar{B}$ mixing in the light of recent LHCb data.
Constraints on new physics in $B-\bar{B}$ mixing in the light of recent LHCb data.
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根据最近的 LHCb 数据，$B-ar{B}$ 混合中新物理的约束。
DOI：
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发表时间：
2012
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通讯作者：
S. T’Jampens
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作者：
A. Lenz;U. Nierste;J. Charles;S. Descotes;H. Lacker;S. Monteil;V. Niess;S. T’Jampens
我们对在Delta F=2中适应新物理(NP)的三个场景进行了独立于模型的统计分析。在B_d-B_d-bar和B_S-B_S-bar的NP不相关的情况下，我们发现代表标准模型的参数点有2.7%的标准偏差。然而，最近关于B_S中性介子混合的LHCb数据禁止D0数据很好地适应半轻子CP不对称A_SL。我们介绍了第四种情形，在M_12^d，S和伽玛_12^d，S中都有NP，它可以容纳所有的数据。我们讨论了这种可能性的可行性，并强调了分别测量半轻子B_d和B_S衰变中CP不对称性的重要性。所有结果都是通过CKMfitter分析包获得的，该分析包采用频率统计方法，并使用Rfit处理理论上的不确定因素。
We perform model-independent statistical analyses of three scenarios accommodating New Physics (NP) in Delta F=2 flavour-changing neutral current amplitudes. In a scenario in which NP in B_d-B_d-bar and B_s-B_s-bar is uncorrelated, we find the parameter point representing the Standard-Model disfavoured by 2.7 standard deviations. However, recent LHCb data on B_s neutral-meson mixing forbid a good accommodation of the D0 data on the semileptonic CP asymmetry A_SL. We introduce a fourth scenario with NP in both M_12^d,s and Gamma_12^d,s, which can accommodate all data. We discuss the viability of this possibility and emphasise the importance of separate measurements of the CP asymmetries in semileptonic B_d and B_s decays. All results have been obtained with the CKMfitter analysis package, featuring the frequentist statistical approach and using Rfit to handle theoretical uncertainties.