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Search: authors:"Marco Zaro"

7 papers found.
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Lepton-pair production in association with a \( b\overline{b} \) pair and the determination of the W boson mass

Abstract We perform a study of lepton-pair production in association with bottom quarks at the LHC based on the predictions obtained at next-to-leading order in QCD, both at fixed order and matched with a QCD parton shower. We consider a comprehensive set of observables and estimate the associated theoretical uncertainties by studying the dependence on the perturbative QCD scales...

Large NLO corrections in $$ t\overline{t}{W}^{\pm } $$ and tt¯tt¯$$ t\overline{t}t\overline{t} $$ hadroproduction from supposedly subleading EW contributions

Abstract We calculate the complete-NLO predictions for \( t\overline{t}{W}^{\pm } \) and \( t\overline{t}t\overline{t} \) production in proton-proton collisions at 13 and 100 TeV. All the non-vanishing contributions of \( \mathcal{O}\left({\alpha}_s^i{\alpha}^j\right) \) with i + j = 3, 4 for \( t\overline{t}{W}^{\pm } \) and i + j = 4, 5 for \( t\overline{t}t\overline{t} \) are...

Top-pair production at the LHC through NNLO QCD and NLO EW

Abstract In this work we present for the first time predictions for top-quark pair differential distributions at the LHC at NNLO QCD accuracy and including EW corrections. For the latter we include not only contributions of \( \mathcal{O}\left({\alpha}_s^2\alpha \right) \), but also those of order \( \mathcal{O}\left({\alpha}_s{\alpha}^2\right) \) and \( \mathcal{O}\left({\alpha...

Precise predictions for same-sign W-boson scattering at the LHC

Vector-boson scattering processes are of great importance for the current run-II and future runs of the Large Hadron Collider. The presence of triple and quartic gauge couplings in the process gives access to the gauge sector of the Standard Model (SM) and possible new-physics contributions there. To test any new-physics hypothesis, sound knowledge of the SM contributions is...

tWH associated production at the LHC

We study Higgs boson production in association with a top quark and a W boson at the LHC. At NLO in QCD, tWH interferes with \(t\bar{t} H\) and a procedure to meaningfully separate the two processes needs to be employed. In order to define tWH production for both total rates and differential distributions, we consider the diagram removal and diagram subtraction techniques that...

Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction

At the LHC the CP properties of the top-quark Yukawa interaction can be probed through Higgs production in gluon fusion or in association with top quarks. We consider the possibility for both CP-even and CP-odd couplings to the top quark to be present, and study CP-sensitive observables at next-to-leading order (NLO) in QCD, including parton-shower effects. We show that the...

Higgs characterisation via vector-boson fusion and associated production: NLO and parton-shower effects

Vector-boson fusion and associated production at the LHC can provide key information on the strength and structure of the Higgs couplings to the Standard Model particles. Using an effective field theory approach, we study the effects of next-to-leading order (NLO) QCD corrections matched to a parton shower on selected observables for various spin-0 hypotheses. We find that...