Eur. Phys. J. C (2016) 76: 533
https://doi.org/10.1140/epjc/s10052-016-4376-2

Regular Article - Theoretical Physics

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

School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran

^* e-mail: setesami@cern.ch

Received: 11 June 2016
Accepted: 15 September 2016
Published online: 29 September 2016

Abstract

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) as well as the triple gauge-boson couplings (WW). The study is based on the modifications of the t and WW 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 and WW couplings. It is shown that the proposed angular asymmetry can distinguish anomalous t, WW couplings from the standard model prediction and yield a great sensitivity.