Mathieu Pellen

Complete NLO corrections to W+W+ scattering and its irreducible background at the LHC

A bstractThe process pp → μ+νμe+νejj receives several contributions of different orders in the strong and electroweak coupling constants. Using appropriate event selections, this process is dominated by vector-boson scattering (VBS) and has recently been measured at the LHC. It is thus of prime importance to estimate precisely each contribution. In this article we compute for the first time the full NLO QCD and electroweak corrections to VBS and its irreducible background processes with realistic experimental cuts. We do not rely on approximations but use complete amplitudes involving two different orders at tree level and three different orders at one-loop level. Since we take into account all interferences, at NLO level the corrections to the VBS process and to the QCD-induced irreducible background process contribute at the same orders. Hence the two processes cannot be unambiguously distinguished, and all contributions to the μ+νμe+νejj final state should be preferably measured together.

Automation of NLO QCD and EW corrections with Sherpa and Recola

This publication presents the combination of the one-loop matrix-element generator Recola with the multipurpose Monte Carlo program Sherpa. Since both programs are highly automated, the resulting Sherpa +Recola framework allows for the computation of – in principle – any Standard Model process at both NLO QCD and EW accuracy. To illustrate this, three representative LHC processes have been computed at NLO QCD and EW: vector-boson production in association with jets, off-shell

NLO electroweak corrections to vector-boson scattering at the LHC

mathrm{Z}

Electroweak corrections to vector-boson scattering

Z-boson pair production, and the production of a top-quark pair in association with a Higgs boson. In addition to fixed-order computations, when considering QCD corrections, all functionalities of Sherpa, i.e. particle decays, QCD parton showers, hadronisation, underlying events, etc. can be used in combination with Recola. This is demonstrated by the merging and matching of one-loop QCD matrix elements for Drell–Yan production in association with jets to the parton shower. The implementation is fully automatised, thus making it a perfect tool for both experimentalists and theorists who want to use state-of-the-art predictions at NLO accuracy.

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

A bstractWe present NLO electroweak corrections to Higgs production in association with off-shell top-antitop quark pairs. The full process pp→e+νeμ−ν¯μbb¯H

Dark Matter at the LHC and IceCube - a Simplified Model Interpretation

mathrm{pp}to {mathrm{e}}^{+}{nu}_{mathrm{e}}{mu}^{-}{overline{nu}}_{mu}mathrm{b}overline{mathrm{b}}mathrm{H}