期刊
CHINESE PHYSICS C
卷 42, 期 12, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1674-1137/42/12/123107
关键词
effective field theory; top quark; lepton collider
资金
- IHEP [Y7515540U1]
- Marie Sklodowska-Curie Individual Fellowship of the European Commission's Horizon 2020 Programme [704187]
We 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.
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