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arXiv 1409.6963hep-phhep-ex
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$B$ -在标准模型中混合和超出标准模型

$B$-mixing in and beyond the Standard model

Alexander Lenz

摘要:

本文综述了中性$B$ -介子混合的研究现状,讨论了目前标准模型(SM)预测的精度以及新物理效应的发展空间。在这方面,我们提出了几个观测量,这是特别敏感的剩余的新物理(NP)参数空间。$B$ -混合也可以用来检验量子力学的基础,本文提出了一种新的同号双轻子事件与异号双轻子事件之比的测量方法。最后对重强子寿命的研究现状作了简要的总结。相应的理论预测依赖于相同的工具-重夸克展开(HQE)-作为一些混合量。新的实验数据最近证明了HQE的有效性,以高精度。然而,寿命预测的理论精度是强烈的限制,缺乏非微扰评估的矩阵元素的六维运营商。

英文摘要:

We review the status of mixing of neutral $B$-mesons, including a discussion of the current precision of Standard Model (SM) predictions as well as the space that is left for effects of new physics. In that respect we present several observables, which are particularly sensitive to the remaining new physics (NP) parameter space. $B$-mixing can also be used to test the fundaments of quantum mechanics, here we suggest a new measurement of the ratio of like-sign dilepton events to opposite-sign dilepton events. Finally we summarise briefly the status of lifetimes of heavy hadrons. The corresponding theory predictions rely on the same tool - the Heavy Quark Expansion (HQE) - as some of the mixing quantities. New experimental data has recently proven the validity of the HQE to a high accuracy. However, the theoretical precision of lifetime predictions is strongly limited by a lack of non-perturbative evaluations of matrix elements of dimension-six operators.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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