Measurement of single top-quark production in association with a boson in collisions at with the ATLAS detector
G. Aad (CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France); E. Aakvaag (Department for Physics and Technology, University of Bergen, Bergen, Norway); B. Abbott (Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma, USA); S. Abdelhameed (New York University Abu Dhabi, Abu Dhabi, United Arab Emirates); K. Abeling (II. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany); et al - Show all 2920 authors
The inclusive cross section for the production of a single top quark in association with a boson is measured using of proton-proton collision data collected with the ATLAS detector at . Events containing two charged leptons and at least one jet identified as originating from a -quark are selected. A multivariate discriminant is constructed to separate the signal from the background. The cross section is extracted using a profile likelihood fit to the signal and control regions and it is measured to be , in good agreement with the Standard Model prediction. The measured cross section is used to extract a value for the left-handed form factor at the vertex times the Cabibbo-Kobayashi-Maskawa matrix element of .
