Abstract
We study the production of a top-quark pair in association with one and two vector bosons, $t \bar t V$ and $t \bar t VV$ with $V=\gamma, Z, W^\pm$, at the LHC. We provide predictions at next-to-leading order in QCD for total cross sections and top-quark charge asymmetries as well as for differential distributions. A thorough discussion of the residual theoretical uncertainties related to missing higher orders and to parton distribution functions is presented. As an application, we calculate the total cross sections for this class of processes (together with $t \bar t H$ and $t \bar t t \bar t$ production) at hadron colliders for energies up to 100 TeV. In addition, by matching the NLO calculation to a parton shower, we determine the contribution of $t \bar t V$ and $t \bar t VV$ to final state signatures (two-photon and two-same-sign-, three- and four-lepton) relevant for $t \bar t H$ analyses at the Run II of the LHC.
Highlights
JHEP02(2016)113 the impact of higher-order corrections on the corresponding theoretical predictions are expected to become even more relevant [3]
We study the production of a top-quark pair in association with one and two vector bosons, ttV and ttV V with V = γ, Z, W ±, at the LHC
In this work we focus on a specific class of high-multiplicity production process in the SM, i.e., the associated production of a top-quark pair with either one or two gauge vector bosons
Summary
JHEP02(2016)113 the impact of higher-order corrections on the corresponding theoretical predictions are expected to become even more relevant [3]. We perform a detailed study of the predictions at fixed NLO QCD accuracy for all the ttV and ttV V processes, together with ttH and ttttproduction, within the same calculation framework and using the same input parameters. This approach allows to investigate, for the first time, whether either common features or substantial differences exist among the theoretical predictions for different final states. The reader can find in the text all the inputs and set of instructions that are necessary to obtain the results presented here
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