New emerging results in Higgs precision analysis updates 2018 after establishment of third-generation Yukawa couplings

• Published in: The journal of high energy physics Vol. 2019; no. 9; pp. 1 - 29
• Main Authors: Cheung, Kingman, Lee, Jae Sik, Tseng, Po-Yan
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-09-2019; Springer Nature B.V; SpringerOpen
• Subjects: Classical and Quantum Gravitation; Confidence intervals; Couplings; Elementary Particles; Higgs bosons; High energy physics; Phenomenological Models; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Quarks; Regular Article - Theoretical Physics; Relativity Theory; Signal strength; String Theory; Phenomenological Models
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP09(2019)098

A
bstract
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
σ
above the SM value (
μ
= 1.10 ± 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-γ-γ
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.