We consider one-loop QCD corrections to Higgs-boson production via vector-boson fusion at hadron colliders. As an input for future exact NNLO computations, we derive the one-loop helicity amplitudes to higher orders in the dimensional regulator. We present a direct calculation of the amplitudes with spinor-helicity techniques and different $\gamma_5$ schemes. In addition, we compare this approach to a projector-based calculation. In order to derive analytical results to higher orders in $\epsilon$, we calculate the pentagon master integrals by the method of $\epsilon$-factorised differential equations and express them in terms of an algebraically independent set of basis functions.
We present the first direct computation of the two-loop QCD virtual corrections to the production of a top-antitop quark pair in association with a Higgs boson ($t\bar{t}H$) at the LHC. We focus on the quark-antiquark channel and perform the calculation in the generalised leading-colour approximation. We combine state-...
We consider a planar and a non-planar two-loop Feynman integral family arising in non-factorisable quantum chromodynamics corrections to Higgs-boson production via vector boson fusion. We construct basis integrals which fulfil canonical differential equations with respect to seven variables for the external kinematics...
Linus Gotzfried, A. von Manteuffel· 2 citations· ⚡1
In this paper, we present the first results for the one-loop decay $A \rightarrow ZZ\gamma$ in the Two-Higgs-Doublet Model and its extension with Vector-Like Quarks. We calculate the one-loop partial decay widths and branching ratios for both unpolarized and polarized final-state $Z$ bosons. The effects of Vector-Like...
We calculate next-to-leading order QCD corrections for the process $gg \to W^+W^-$ with two off-shell $W$ bosons, accounting for virtual top quarks in the loop diagrams. Our approach relies on combining expansions valid in different regions of phase space. Specifically, we perform a high-energy expansion in which the M...
M. Czaja, Ben Rott, Matthias Steinhauser et al.· 0 citations
We present the complete two-loop QCD amplitudes for the production of a top-quark pair in the quark--antiquark annihilation and gluon-fusion channels in analytic form up to order $\mathcal{O}(\varepsilon^2)$. Our analysis maintains full dependence on the top-quark mass and on the number of colours. The amplitudes are e...
F. Buccioni, Christoph Nega, Benjamin Sauer et al.· 0 citations
We present a complete analytic calculation of the next-to-leading-order (NLO) QCD cross sections for the production of an electroweak vector boson ($W^\pm$, $Z/\gamma^*$) at finite transverse momentum, decomposed into the full set of helicity cross sections that determine the angular coefficients $A_0$-$A_7$ of the lep...
S. Camarda, L. Cieri, Giancarlo Ferrera et al.· 1 citation
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