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arXiv 1412.6038hep-phhep-ex
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Higgs衰变中的赝观测量

Pseudo-observables in Higgs decays

Martin Gonzalez-Alonso, Admir Greljo, Gino Isidori, David Marzocca

摘要:

我们定义了一组伪观测量的特性希格斯衰变的通用扩展的标准模型没有新的粒子低于希格斯质量。伪观测量可以从实验数据中确定,提供了迄今为止LHC实验所采用的“卡帕框架”的系统概括。伪观测量是从壳层衰变振幅定义的,允许系统地包含高阶QED和QCD校正,并且可以在任何有效场论(EFT)方法中计算希格斯物理。我们分析了从轻子普适性,CP不变性,保管对称性,线性实现的电弱对称性破缺的假设,独立的伪观测量的数量减少。我们概述了运动学研究的重要性$h\to 4\ell$衰变提取这些参数,并提出了他们的预测在线性EFT框架。

英文摘要:

We define a set of pseudo-observables characterizing the properties of Higgs decays in generic extensions of the Standard Model with no new particles below the Higgs mass. The pseudo-observables can be determined from experimental data, providing a systematic generalization of the "kappa-framework" so far adopted by the LHC experiments. The pseudo-observables are defined from on-shell decay amplitudes, allow for a systematic inclusion of higher-order QED and QCD corrections, and can be computed in any Effective Field Theory (EFT) approach to Higgs physics. We analyze the reduction of the number of independent pseudo-observables following from the hypotheses of lepton-universality, CP invariance, custodial symmetry, and linearly realized electroweak symmetry breaking. We outline the importance of kinematical studies of $h\to 4\ell$ decays for the extraction of such parameters and present their predictions in the linear EFT framework.

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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