Abstract
The high luminosity that will be accumulated at the LHC will enable precise differential measurements of the hadronic production of a top–antitop-quark pair in association with a text {W} boson. Therefore, an accurate description of this process is needed for realistic final states. In this work we combine for the first time the NLO QCD and electroweak corrections to the full off-shell text {t} overline{text {t}}text {W} ^+ production at the LHC in the three-charged-lepton channel, including all spin correlations, non-resonant effects, and interferences. To this end, we have computed the NLO electroweak radiative corrections to the leading QCD order as well as the NLO QCD corrections to both the QCD and the electroweak leading orders.
Highlights
The hadronic production of top-antitop pairs in association with a W boson is an interesting process to investigate at the Large Hadron Collider (LHC), as it represents an important probe of the Standard Model (SM) as well as a window to new physics
Due to the ambiguity in choosing the +ν pair that results from the top quark, we pick the pair of leptons that when combined with the bottom quark forms an invariant mass closest to the top-quark mass
In this work we have presented the next-to-leading order (NLO) corrections to the off-shell production of ttW+ at the LHC in the threecharged-lepton channel
Summary
The hadronic production of top-antitop pairs in association with a W boson is an interesting process to investigate at the Large Hadron Collider (LHC), as it represents an important probe of the Standard Model (SM) as well as a window to new physics. The increased statistics will enable more precise measurements of ttW± cross-sections, and measurements of differential distributions and in different decay channels This target can only be achieved if the theoretical description of realistic final states embedding the ttW resonance structure is available. The first next-to-leading order (NLO) QCD calculation for TeV-scale colliders was performed in a spin-correlated narrow-width approximation for the semi-leptonic decay channel [26]. NLO QCD corrections to the EW leading order (LO) have been computed in the narrow-width approximation (NWA), accounting for complete spin correlations and including parton-shower effects [37,38]. Our present work targets the complete fixed-order description of the off-shell ttW production, combining the NLO QCD and EW corrections that have a sizeable impact at the LHC@13TeV.
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