Global and optimal probes for the top-quark effective field theory at future lepton colliders

doi:10.1007/jhep10(2018)168

	Global and optimal probes for the top-quark effective field theory at future lepton colliders
	Vos, Marcel; Perelló, Martín; Durieux, Gauthier; Zhang C(张岑); Zhang, Cen
刊名	JOURNAL OF HIGH ENERGY PHYSICS
	2018
期号	10 页码:168
关键词	Beyond Standard Model Effective Field Theories Heavy Quark Physics
ISSN号	1029-8479
DOI	10.1007/jhep10(2018)168
文献子类	Article
英文摘要	We study the sensitivity to physics beyond the standard model of precise top-quark pair production measurements at future lepton colliders. A global effective-field-theory approach is employed, including all ten dimension-six operators of the Warsaw basis which involve a top-quark and give rise to tree-level amplitudes that interfere with standard-model e+e-tt ones in the limit of vanishing b-quark mass. Four-fermion and CP-violating contributions are taken into account. Circular-collider-, ILC- and CLIC-like benchmark run scenarios are examined. We compare the constraining power of various observables to a set of statistically optimal ones which maximally exploit the information contained in the fully differential bW+ distribution. The enhanced sensitivity gained on the linear contributions of dimension-six operators leads to bounds that are insensitive to quadratic ones. Even with statistically optimal observables, two centre-of-mass energies are required for constraining simultaneously two- and four-fermion operators. The impact of the centre-of-mass energy lever arm is discussed, that of beam polarization as well. A realistic estimate of the precision that can be achieved in ILC- and CLIC-like operating scenarios yields individual limits on the electroweak couplings of the top quark that are one to three orders of magnitude better than constraints set with Tevatron and LHC run I data, and three to two hundred times better than the most optimistic projections made for the high-luminosity phase of the LHC. Clean global constraints can moreover be obtained at lepton colliders, robustly covering the multidimensional effective-field-theory space with minimal model dependence.
WOS关键词	CP-VIOLATION ; EFFECTIVE OPERATORS ; LINEAR COLLIDERS ; PARTICLE WIDTHS ; PAIR PRODUCTION ; DECAYS ; COUPLINGS ; SINGULARITIES ; DISTRIBUTIONS ; POLARIZATION
WOS研究方向	Astronomy & Astrophysics ; Physics
语种	英语
WOS记录号	WOS:000448812600001
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/286745]
专题	高能物理研究所_理论物理室
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Vos, Marcel,Perelló, Martín,Durieux, Gauthier,et al. Global and optimal probes for the top-quark effective field theory at future lepton colliders[J]. JOURNAL OF HIGH ENERGY PHYSICS,2018(10):168.
APA	Vos, Marcel,Perelló, Martín,Durieux, Gauthier,张岑,&Zhang, Cen.(2018).Global and optimal probes for the top-quark effective field theory at future lepton colliders.JOURNAL OF HIGH ENERGY PHYSICS(10),168.
MLA	Vos, Marcel,et al."Global and optimal probes for the top-quark effective field theory at future lepton colliders".JOURNAL OF HIGH ENERGY PHYSICS .10(2018):168.