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arXiv · 1810.02521

New Emerging Results in Higgs Precision Analysis Updates 2018 after Establishment of Third-Generation Yukawa Couplings

Kingman Cheung·Jae Sik Lee·Po-Yan Tseng
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Abstract

We perform global fits of the Higgs boson couplings to all the 7 TeV, 8 TeV, and 13 TeV data available up to the Summer 2018. New measurements at 13 TeV extend to include the Higgs signal strengths exclusively measured in associated Higgs production with top-quark pair and the third-generation Yukawa couplings now have been established. Some important consequences emerge from the global fits. (i) The overall average signal strength of the Higgs boson stands at $2\sigma$ above the SM value ($\mu = 1.10 \pm 0.05 $). (ii) For the first time the bottom-quark Yukawa coupling shows a preference of the positive sign to the negative one. (iii) The negative top-quark Yukawa coupling is completely ruled out unless there exist additional particles running in the $H$-$\gamma$-$\gamma$ loop with contributions equal to two times the SM top-quark contribution within about 10 \%. (iv) The branching ratio for nonstandard decays of the Higgs boson is now below 8.4\% at the 95\% confidence level.

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Kingman Cheung, Jae Sik Lee, Po-Yan Tseng. 2018-10-05. New Emerging Results in Higgs Precision Analysis Updates 2018 after Establishment of Third-Generation Yukawa Couplings. https://doi.org/10.1007/jhep09(2019)098

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