arXiv 1602.026782016-02-08hep-phhep-ex

带电轻子前后不对称性对重夸克参数的补充信息

Additional Information on Heavy Quark Parameters from Charged Lepton Forward-Backward Asymmetry

Sascha Turczyk

DOI：: 10.1007/JHEP04(2016)131

摘要：

使用包容性和排他性（半）轻子衰变测定$|V_{cb}|$显示出不同${\cal O}(3 σ)$意义的长期张力。对于包容性的确定的衰变率扩展在$1/m_b$使用重夸克扩展，和从物理观测量的时刻，高阶重夸克参数提取的实验数据，以评估$|V_{cb}|$从归一化。缺点是这些观测量之间的理论和实验上的高度相关性。我们将仔细审查包容性的确定，以增加一个新的和相关性较低的可观察数据。这个观测值与带电轻子的衰变角有关，可以帮助以一种新的方式约束重要的重夸克参数。它可以验证当前看似稳定的$|V_{cb}|$提取从包含衰变或暗示可能的问题，甚至可能是敏感的新物理算子。

英文摘要：

The determination of $|V_{cb}|$ using inclusive and exclusive (semi-)leptonic decays exhibits a long-standing tension of varying ${\cal O}(3 σ)$ significance. For the inclusive determination the decay rate is expanded in $1/m_b$ using heavy quark expansion, and from moments of physical observables the higher order heavy quark parameters are extracted from experimental data in order to assess $|V_{cb}|$ from the normalisation. The drawbacks are high correlations both theoretically as well as experimentally among these observables. We will scrutinise the inclusive determination in order to add a new and less correlated observable. This observable is related to the decay angle of the charged lepton and can help to constrain the important heavy quark parameters in a new way. It may validate the current seemingly stable extraction of $|V_{cb}|$ from inclusive decays or hints to possible issues, and even may be sensitive to New Physics operators.

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英文摘要：

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