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arXiv 1808.05948hep-ph
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对$Z$玻色子衰变的SMEFT修正

SMEFT Corrections to $Z$ Boson Decays

Sally Dawson, Ahmed Ismail

摘要:

我们计算了标准模型有效场论(SMEFT)中6维算符对$Z$衰变性质的单圈修正,这也有助于反常的3规范玻色子耦合,并研究了这两个过程对反常耦合的相对敏感性。贡献的大小是百分之几的数量级,与标准模型电弱修正的大小相同。这是SMEFT中计算电弱量到一个回路的程序的一部分:这些计算对于未来的全局拟合是需要的,以将六维威尔逊系数的系数始终限制在一个回路上。

英文摘要:

We compute the one-loop corrections to $Z$ decay properties from dimension-6 operators in the Standard Model Effective Field Theory (SMEFT) that contribute also to anomalous 3-gauge boson couplings and examine the relative sensitivity of the two processes to the anomalous couplings. The size of the contributions is of order a few percent, of the same size as Standard Model electroweak corrections. This is part of a program of computing electroweak quantities to one-loop in the SMEFT: these calculations are needed for a future global fit to limit the coefficients of the dimension-six Wilson coefficients consistently at one loop.

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