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Probing top-quark couplings indirectly at Higgs factories
Durieux, G; Gu, JY; Vryonidou, E; Zhang, C; Zhang C(张岑)
Source PublicationCHINESE PHYSICS C
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 t (t) over bar 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 t (t) over bar 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 (t) over bar production threshold is also helpful for the determination of Higgs and triple-gauge-boson couplings. In addition, we find that below the e(+)e(-) -> t (t) over barh 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.
Keywordeffective field theory top quark lepton collider
Indexed BySCI
WOS Research AreaPhysics
WOS SubjectPhysics, Nuclear ; Physics, Particles & Fields
WOS IDWOS:000451430300007
ADS Bibcode2018ChPhC..42l3107D
Citation statistics
Cited Times:30 [ADS]
Document Type期刊论文
Corresponding AuthorZhang C(张岑)
First Author AffilicationInstitute of High Energy
Corresponding Author AffilicationInstitute of High Energy
Recommended Citation
GB/T 7714
Durieux, G,Gu, JY,Vryonidou, E,et al. Probing top-quark couplings indirectly at Higgs factories[J]. CHINESE PHYSICS C,2018,42(12):123107.
APA Durieux, G,Gu, JY,Vryonidou, E,Zhang, C,&张岑.(2018).Probing top-quark couplings indirectly at Higgs factories.CHINESE PHYSICS C,42(12),123107.
MLA Durieux, G,et al."Probing top-quark couplings indirectly at Higgs factories".CHINESE PHYSICS C 42.12(2018):123107.
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