title: tWHassociated production at the LHC.
abstract: We study Higgs boson production in association with a top quark and aWboson at the LHC. At NLO in QCD,tWHinterferes with [Formula: see text] and a procedure to meaningfully separate the two processes needs to be employed. In order to definetWHproduction for both total rates and differential distributions, we consider the diagram removal and diagram subtraction techniques that have been previously proposed for treating intermediate resonances at NLO, in particular in the context oftWproduction. These techniques feature approximations that need to be carefully taken into account when theoretical predictions are compared to experimental measurements. To this aim, we first critically revisit thetWprocess, for which an extensive literature exists and where an analogous interference with [Formula: see text] production takes place. We then provide robust results for total and differential cross sections fortWandtWHat 13 TeV, also matching short-distance events to a parton shower. We formulate a reliable prescription to estimate the theoretical uncertainties, including those associated to the very definition of the process at NLO. Finally, we study the sensitivity to a non-Standard-Model relative phase between the Higgs couplings to the top quark and to theWboson intWHproduction.
authors.affiliation: Centre for Cosmology, Particle Physics and Phenomenology (CP3), Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium.
authors.forename: Federico
authors.identifier: 0000-0001-6601-4542
authors.initials: F
authors.lastname: Demartin
authors.affiliation: Institut für Experimentelle Kernphysik, Karlsruher Institut für Technologie (KIT), 76131 Karlsruhe, Germany.|Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, MA 02139 USA.
authors.forename: Benedikt
authors.initials: B
authors.lastname: Maier
authors.affiliation: Centre for Cosmology, Particle Physics and Phenomenology (CP3), Université catholique de Louvain, 1348 Louvain-la-Neuve, Belgium.
authors.forename: Fabio
authors.initials: F
authors.lastname: Maltoni
authors.affiliation: Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS/IN2P3, Avenue des Martyrs 53, 38026 Grenoble, France.|Theoretische Natuurkunde and IIHE/ELEM, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium.|International Solvay Institutes, Pleinlaan 2, 1050 Brussels, Belgium.
authors.forename: Kentarou
authors.initials: K
authors.lastname: Mawatari
authors.affiliation: Sorbonne Universités, UPMC Univ. Paris 06, UMR 7589, LPTHE, 75005 Paris, France.|CNRS, UMR 7589, LPTHE, 75005 Paris, France.
authors.forename: Marco
authors.initials: M
authors.lastname: Zaro