associated production at the LHC.

Eur Phys J C Part Fields

Sorbonne Universités, UPMC Univ. Paris 06, UMR 7589, LPTHE, 75005 Paris, France.

Published: January 2017

We study Higgs boson production in association with a top quark and a boson at the LHC. At NLO in QCD, interferes with [Formula: see text] and a procedure to meaningfully separate the two processes needs to be employed. In order to define production 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 of production. 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 the process, 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 for and at 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 the boson in production.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5312113PMC
http://dx.doi.org/10.1140/epjc/s10052-017-4601-7DOI Listing

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