期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 12, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP12(2019)098
关键词
Phenomenology of Field Theories in Higher Dimensions
资金
- Spanish national program for particle physics (MINECO/FEDER) [FPA2015-65652-C4-3-R]
- PROMETEO grant of the Generalitat Valenciana [2018/060]
- Severo Ochoa Grant [SEV-2014-0398-05, BES-2015-072974]
- Lady Davis Foundation
- Spanish Government from the EU Commission [FPA2017-84445-P]
- ERDF funds from the EU Commission [FPA2017-84445-P]
- Generalitat Valenciana [Prometeo/2017/053]
- Spanish Centro de Excelencia Severo Ochoa Programme [SEV-2014-0398]
- DFG cluster of excellence Origin and Structure of the Universe
- Ministerio de Ciencia, Innovacion y Universidades, Spain [FPU16/01911, FPU15/05103]
We evaluate the implications of LHC and LEP/SLC measurements for the electro-weak couplings of the top and bottom quarks. We derive global bounds on the Wilson coefficients of ten two-fermion operators in an effective field theory description. The combination of hadron collider data with Z -pole measurements is found to yield tight limits on the operator coefficients that modify the left-handed couplings of the bottom and top quark to the Z boson. We also present projections for the high-luminosity phase of the LHC and for future electron-positron colliders. The bounds on the operator coefficients are expected to improve substantially during the remaining LHC programme, by factors of 1 to 5 if systematic uncertainties are scaled as statistical ones. The operation of an e(+)e(-) collider at a center-of-mass energy above the top-quark pair production threshold is expected to further improve the bounds by one to two orders of magnitude. The combination of measurements in pp and e(+)e(-) collisions allows for a percent-level determination of the top-quark Yukawa coupling, that is robust in a global fit.
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