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arXiv 1206.1872hep-ph
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B衰变中轻子味普适性违反的意义

Implications of lepton flavor universality violations in B decays

Svjetlana Fajfer, Jernej F. Kamenik, Ivan Nisandzic, Jure Zupan

摘要:

目前对b->c tau nu和b->u tau nu跃迁的测量结果与标准模型对轻子味普适性的预测相差近4 σ。我们研究新的物理解释这种异常。一个有效场论分析表明,最小的味道违反模型不是首选的解释,但也尚未排除。考虑到一般的味违反,右-右矢量和右-左标量夸克流被确定为可行的候选者。我们讨论了两个希格斯双重模型,leptoquarks以及夸克和轻子复合明确的例子。最后,对LHC的搜索和未来的测量(超级)B-工厂的影响。

英文摘要:

Present measurements of b->c tau nu and b->u tau nu transitions differ from the standard model predictions of lepton flavor universality by almost 4sigma. We examine new physics interpretations of this anomaly. An effective field theory analysis shows that minimal flavor violating models are not preferred as an explanation, but are also not yet excluded. Allowing for general flavor violation, right-right vector and right-left scalar quark currents are identified as viable candidates. We discuss explicit examples of two Higgs doublet models, leptoquarks as well as quark and lepton compositeness. Finally, implications for LHC searches and future measurements at the (super)B- factories are presented.

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