Measuring anomalous WW [equation] and t [equation] couplings using top+ [equation] production at the LHC

摘要

We consider the electroweak production of a top quark in association with a photon at the LHC to probe the electroweak top quark couplings (t(ar{ ext {t}}gamma )) as well as the triple gauge-boson couplings (WW(gamma )). The study is based on the modifications of the t(ar{ ext {t}}gamma ) and WW(gamma ) interactions via heavy degrees of freedom in the form of dimension-six operators which we add to the standard model Lagrangian. A binned angular asymmetry in single top quark plus photon events and cross section ratio are proposed to probe the anomalous t(ar{ ext {t}}gamma ) and WW(gamma ) couplings. It is shown that the proposed angular asymmetry can distinguish anomalous t(ar{ ext {t}}gamma ), WW(gamma ) couplings from the standard model prediction and yield a great sensitivity.