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Search: authors:"Davide Pagani"

6 papers found.
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Constraining the Higgs self-couplings at e+e− colliders

Abstract We study the sensitivity to the shape of the Higgs potential of single, double, and triple Higgs production at future e+e− colliders. Physics beyond the Standard Model is parameterised through the inclusion of higher-dimensional operators (Φ†Φ−v2/2)n/Λ(2n−4) with n = 3, 4, which allows a consistent treatment of independent deviations of the cubic and quartic self...

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...

Trilinear Higgs coupling determination via single-Higgs differential measurements at the LHC

We study one-loop effects induced by an anomalous Higgs trilinear coupling on total and differential rates for the \(H\rightarrow 4\ell \) decay and some of the main single-Higgs production channels at the LHC, namely, VBF, VH, \(t{\bar{t}}H\) and tHj. Our results are based on a public code that calculates these effects by simply reweighting samples of Standard-Model-like events...

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...

Associated production of a top-quark pair with vector bosons at NLO in QCD: impact on \( \mathrm{t}\overline{\mathrm{t}}\mathrm{H} \) searches at the LHC

We study the production of a top-quark pair in association with one and two vector bosons, \( t\overline{t}V \) and \( t\overline{t}V\kern0.1em V \) with V = γ, Z, W ±, 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...

On the impact of lepton PDFs

In this paper we discuss the effect of the complete leading-order QED corrections to the DGLAP equations that govern the perturbative evolution of parton distribution functions (PDFs). This requires the extension of the purely QCD DGLAP evolution including a PDF for the photons and, consistently, also for the charged leptons e ±, μ ± and τ ±. We present the implementation of the...