We examine the constraints that future lepton colliders would impose on the effective field theory describing modifications of top-quark interactions beyond the standard model, through measurements of the e+e−→bW+bˉW− process. Statistically optimal observables are exploited to constrain simultaneously and efficiently all relevant operators. Their constraining power is sufficient for quadratic effective-field-theory contributions to have negligible impact on limits which are therefore basis independent. This is contrasted with the measurements of cross sections and forward-backward asymmetries. An overall measure of constraints strength, the global determinant parameter, is used to determine which run parameters impose the strongest restriction on the multidimensional effective-field-theory parameter space.
@article{arxiv.1708.09849,
title = {Precision constraints on the top-quark effective field theory at future lepton colliders},
author = {Gauthier Durieux},
journal= {arXiv preprint arXiv:1708.09849},
year = {2017}
}