Constraints on generalized non-standard $tbW$ couplings

Abstract

General non-standard $tbW$ couplings are studied as model independently as possible based on the effective Lagrangian consisting of the dimension-6 operators, which is an extension of the standard-model Lagrangian. The $tbW$-interaction Lagrangian in this framework includes four kinds of couplings, which could be complex. Constraints on those non-standard $tbW$ couplings are obtained by comparing the experimental data related to the $t\to bW$ process with the corresponding theoretical formulas derived from the effective Lagrangian. The constraints on some sets of the non-standard couplings are shown not to be so strong because those couplings balance out each other as we treat all the non-standard couplings as complex numbers at the same time.

arXiv comment4 pages, To appear in the proceedings of 38th International Conference on High Energy Physics (ICHEP 2016), Chicago, Aug. 3-10, 2016

References in corpus (8)

• Dimension-Six Terms in the Standard Model Lagrangian
• A minimal set of top anomalous couplings
• Constraining the top-Higgs sector of the Standard Model Effective Field Theory
• Is there room for CP violation in the top-Higgs sector?
• Measurement of the ratio B(t to Wb)/B(t to Wq) in pp collisions at sqrt(s) = 8 TeV
• Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton + jets final states produced in pp collisions at sqrt(s) = 8 TeV
• Full analysis of general non-standard tbW couplings
• Refined analysis and updated constraints on general non-standard tbW couplings