Durieux Gauthier1; Gu Jiayin2; Vryonidou Eleni3; Zhang Cen4
Source Publicationchinesephysicsc
AbstractWe perform a global effective-field-theory analysis to assess the combined precision of Higgs couplings, triple gauge-boson couplings, and top-quark couplings, at future circular e+e- colliders, with a focus on runs below the tt-production threshold. Deviations in the top-quark sector entering as one-loop corrections are consistently taken into account in the Higgs and diboson processes. We find that future lepton colliders running at center-of-mass energies below the tt production threshold can still provide useful information on top-quark couplings, by measuring virtual top-quark effects. With rate and differential measurements, the indirect individual sensitivity achievable is better than at the high-luminosity LHC. However, strong correlations between the extracted top-quark and Higgs couplings are also present and lead to much weaker global constraints on top-quark couplings. This implies that a direct probe of top-quark couplings above the t~ production threshold is also helpful for the determination of Higgs and triple-gauge-boson couplings. In addition, we find that below the e+e- -+tth production threshold, the top-quark Yukawa coupling can be determined by its loop corrections to all Higgs production and decay channels. Degeneracy with the ggh coupling can be resolved, and even a global limit is competitive with the prospects of a linear collider above the threshold. This provides an additional means of determining the top-quark Yukawa coupling indirectly at lepton colliders.
Document Type期刊论文
Affiliation1.DESY Notkestra?e 85
2.PRISMA Cluster of Excellence, Institut fur Physik, Johannes Gutenberg-Universitat
Recommended Citation
GB/T 7714
Durieux Gauthier,Gu Jiayin,Vryonidou Eleni,et al. probingtopquarkcouplingsindirectlyathiggsfactories[J]. chinesephysicsc,2018,042(012):123107.
APA Durieux Gauthier,Gu Jiayin,Vryonidou Eleni,&Zhang Cen.(2018).probingtopquarkcouplingsindirectlyathiggsfactories.chinesephysicsc,042(012),123107.
MLA Durieux Gauthier,et al."probingtopquarkcouplingsindirectlyathiggsfactories".chinesephysicsc 042.012(2018):123107.
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