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arXiv 1302.3909hep-phhep-ex
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BR(Bs至mu+ mu-)作为弱电精密度测试

BR(Bs to mu+ mu-) as an electroweak precision test

Diego Guadagnoli, Gino Isidori

摘要:

使用有效的理论方法,我们分析了BR(Bs到mu+ mu-)在约束新物理模型中的影响,该模型预测了Z玻色子耦合到下型夸克的修改。根据有动机的假设的风味结构的有效的理论,我们表明,目前来自BR(Bs到mu+ mu-)的有效的Z-玻色子耦合的界限是可比的(在最小的风味违反的情况下)或显着更严格(在通用的部分复合性的情况下)相对于那些来自可观的Z峰。

英文摘要:

Using an effective-theory approach, we analyze the impact of BR(Bs to mu+ mu-) in constraining new-physics models that predict modifications of the Z-boson couplings to down-type quarks. Under motivated assumptions about the flavor structure of the effective theory, we show that the bounds presently derived from BR(Bs to mu+ mu-) on the effective Z-boson couplings are comparable (in the case of minimal flavor violation) or significantly more stringent (in the case of generic partial compositeness) with respect to those derived from observables at the Z peak.

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