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arXiv 1608.02159hep-phhep-ex
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电弱对称破缺的金探针

Golden Probe of Electroweak Symmetry Breaking

Yi Chen, Joe Lykken, Maria Spiropulu, Daniel Stolarski, Roberto Vega-Morales

备注：
8 pages
发表信息：
Phys. Rev. Lett. 117, 241801 (2016)
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摘要：

希格斯粒子与$WW$和$ZZ$对的耦合比（$λ_{WZ}$）是电弱对称破缺的基本参数，也是规范玻色子质量矩阵所具有的（近似）保管对称性的度量。我们表明，希格斯衰变到四轻子是敏感的，通过树水平/1-圈干扰效应，无论是幅度，特别是整体符号的$λ_{WZ}$。确定该符号需要干扰效应，因为几乎不可能用速率信息进行测量。此外，简单地确定符号有效地建立了希格斯玻色子的保管表示。我们发现，$h\to4\ell$（$4\ell \equiv 2e2μ, 4e, 4μ$）衰变有很好的前景，直接建立在高亮度13 TeV LHC的整体标志。我们还研究了$h\to4\ell$对$λ_{WZ}$量级的最终LHC灵敏度。我们的结果是独立的其他测量的希格斯玻色子耦合，特别是，在很大程度上免费的假设顶夸克汤川耦合也进入1圈。这使得$h\to4\ell$成为研究电弱对称性破缺机制和保管对称性的独特而独立的探针。

英文摘要：

The ratio of the Higgs couplings to $WW$ and $ZZ$ pairs, $λ_{WZ}$, is a fundamental parameter in electroweak symmetry breaking as well as a measure of the (approximate) custodial symmetry possessed by the gauge boson mass matrix. We show that Higgs decays to four leptons are sensitive, via tree level/1-loop interference effects, to both the magnitude and, in particular, overall sign of $λ_{WZ}$. Determining this sign requires interference effects, as it is nearly impossible to measure with rate information. Furthermore, simply determining the sign effectively establishes the custodial representation of the Higgs boson. We find that $h\to4\ell$ ($4\ell \equiv 2e2μ, 4e, 4μ$) decays have excellent prospects of directly establishing the overall sign at a high luminosity 13 TeV LHC. We also examine the ultimate LHC sensitivity in $h\to4\ell$ to the magnitude of $λ_{WZ}$. Our results are independent of other measurements of the Higgs boson couplings and, in particular, largely free of assumptions about the top quark Yukawa couplings which also enter at 1-loop. This makes $h\to4\ell$ a unique and independent probe of the electroweak symmetry breaking mechanism and custodial symmetry.

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