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arXiv 1601.07166hep-ph
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Mu到e伽马和匹配在mW

Mu to e gamma and matching at mW

Sacha Davidson

摘要:

几个实验寻找μ-e的味道变化,例如在μ-> e转换、μ-> e γ和μ-> 3e中。本文研究了如何将这些实验约束从低能转换到新物理尺度M>> mW。构造了一个QCD和QED不变算符的基(适当的低于mW),然后用QCD和QED的单圈RGE运行到mW。在mW时,这些算符被匹配到SU(2)不变的六维算符上,这些算符可以继续与电弱RGE一起运行。作为一个例子,μ-> e γ界被转换为尺度M,其中它约束两个算子和。这些约束条件与之前对μ-> e γ的EFT分析中得到的约束条件不同,但重现了Z和Higgs的味道变化相互作用的预期边界,因为在mW下的匹配实际上是按照获得"领先"贡献所需的循环顺序进行的。

英文摘要:

Several experiments search for μ- e flavour change, for instance in μ->e conversion, μ-> e γ, and μ-> 3e. This paper studies how to translate these experimental constraints from low energy to a New Physics scale M >> mW. A basis of QCD and QED-invariant operators (as appropriate below mW) is constructed, then run to mW with one-loop RGEs of QCD and QED. At mW, these operators are matched onto SU(2)-invariant dimension-six operators, which can continue to run up with electroweak RGEs. As an example, the μ-> e γbound is translated to the scale M, where it constrains two sums of operators. The constraints differ from those obtained in previous EFT analyses of μ-> e γ, but reproduce the expected bounds on flavour-changing interactions of the Z and the Higgs, because the matching at mW is pragmatically performed to the loop order required to get the "leading" contribution.

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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