8 papers found.

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We present NLO electroweak corrections to Higgs production in association with off-shell top-antitop quark pairs. The full process \( \mathrm{pp}\to {\mathrm{e}}^{+}{\nu}_{\mathrm{e}}{\mu}^{-}{\overline{\nu}}_{\mu}\mathrm{b}\overline{\mathrm{b}}\mathrm{H} \) is considered, and hence all interference, off-shell, and non-resonant contributions are taken into account. The electroweak ...

We present a state-of-the-art calculation of the next-to-leading-order electroweak corrections to ZZ production, including the leptonic decays of the Z bosons into μ + μ −e+e− or μ + μ − μ + μ − final states. We use complete leading-order and next-to-leading-order matrix elements for four-lepton production, including contributions of virtual photons and all off-shell effects of Z ...

For the first time the next-to-leading-order electroweak corrections to the full off-shell production of two top quarks that decay leptonically are presented. This calculation includes all off-shell, non-resonant, and interference effects for the 6-particle phase space. While the electroweak corrections are below one per cent for the integrated cross section, they reach up to 15% ...

We present a consistent renormalization scheme for the CP-conserving Two-Higgs-Doublet Model based on \( \overline{\mathrm{MS}} \) renormalization of the mixing angles and the soft-Z 2-symmetry-breaking scale M sb in the Higgs sector. This scheme requires to treat tadpoles fully consistently in all steps of the calculation in order to provide gauge-independent S-matrix elements. We ...

We compute the hadronic production of top-antitop pairs in association with a Higgs boson at next-to-leading-order QCD, including the decay of the top and antitop quark into bottom quarks and leptons. Our computation is based on full leading and next-to-leading-order matrix elements for \( ...

We investigate unitarity within the complex-mass scheme, a convenient universal scheme for perturbative calculations involving unstable particles in quantum field theory which guarantees exact gauge invariance. Since this scheme requires one to introduce complex masses and complex couplings, the Cutkosky cutting rules, which express perturbative unitarity in theories of stable ...

The next-to-leading-order electroweak corrections to \( \mathrm{pp}\to {l}^{+}{l}^{-}/\overline{\nu}\nu +\upgamma +X \) production, including all off-shell effects of intermediate Z bosons in the complex-mass scheme, are calculated for LHC energies, revealing the typically expected large corrections of tens of percent in the TeV range. Contributions from quark-photon and ...

We present a calculation of the next-to-leading-order electroweak corrections to W+γ production, including the leptonic decay of the W boson and taking into account all off-shell effects of the W boson, where the finite width of the W boson is implemented using the complex-mass scheme. Corrections induced by incoming photons are fully included and find particular emphasis in the ...