NLO electroweak automation and precise predictions for W + multijet production at the LHC
Stefan Kallweit,Stefan Kallweit,Jonas M. Lindert,Philipp Maierhöfer,Philipp Maierhöfer,Stefano Pozzorini,Marek Schönherr,Marek Schönherr +7 more
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In this paper, the authors present a fully automated implementation of next-to-leading order electroweak (NLO EW) corrections in the OpenLoops matrix-element generator combined with the Sherpa and Munich Monte Carlo frameworks.Abstract:
We present a fully automated implementation of next-to-leading order electroweak (NLO EW) corrections in the OpenLoops matrix-element generator combined with the Sherpa and Munich Monte Carlo frameworks. The process-independent character of the implemented algorithms opens the door to NLO QCD + EW simulations for a vast range of Standard Model processes, up to high particle multiplicity, at current and future colliders. As a first application, we present NLO QCD + EW predictions for the production of positively charged on-shell W bosons in association with up to three jets at the Large Hadron Collider. At the TeV energy scale, due to the presence of large Sudakov logarithms, EW corrections reach the 20-40% level and play an important role for searches of physics beyond the Standard Model. The dependence of NLO EW effects on the jet multiplicity is investigated in detail, and we find that W + multijet final states feature genuinely different EW effects as compared to the case of W + 1 jet.read more
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Collier: A fortran-based complex one-loop library in extended regularizations
TL;DR: The library Collier is presented, which provides numerical results for arbitrary tensor and scalar integrals for scattering processes in general quantum field theories and supports complex masses, which are needed in calculations involving unstable particles.
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Event Generation with Sherpa 2.2
Enrico Bothmann,G. S. Chahal,Stefan Höche,Johannes Krause,Frank Krauss,Silvan Kuttimalai,Sebastian Liebschner,Davide Napoletano,Marek Schönherr,Holger Schulz,Steffen Schumann,Frank Siegert +11 more
TL;DR: Sherpa as discussed by the authors is a general-purpose Monte Carlo event generator for the simulation of particle collisions in high-energy collider experiments, which is heavily used for event generation in the analysis and interpretation of LHC Run 1 and Run 2 data.
Journal ArticleDOI
W+W− production at the LHC: fiducial cross sections and distributions in NNLO QCD
TL;DR: In this article, the first fully differential calculation for W ± Z production in hadron collisions up to next-to-nextto-leading order (NNLO) in QCD perturbation theory is reported.
Journal ArticleDOI
OpenLoops 2
Federico Buccioni,Jean-Nicolas Lang,Jonas M. Lindert,Philipp Maierhöfer,Stefano Pozzorini,Hantian Zhang,Max F. Zoller +6 more
TL;DR: This new version of OpenLoops, an automated generator of tree and one-loop scattering amplitudes based on the open-loop recursion, is presented, equipped with an automated system that avoids Gram-determinant instabilities through analytic methods in combination with a new hybrid-precision approach.
Journal ArticleDOI
Electroweak and QCD corrections to top-pair hadroproduction in association with heavy bosons
TL;DR: In this article, the authors compute the contribution of order αβερατε βετε γεταταβετταγαγε βαγγεγε αβδαγβαγ γγεβεγγααβαβγεαγδεγβγγγβεβααα βεγαβγγγε βεβγαστα βασε βγεσα βγ
References
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Journal ArticleDOI
The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
Johan Alwall,Rikkert Frederix,Stefano Frixione,Valentin Hirschi,Fabio Maltoni,Olivier Mattelaer,Hua-Sheng Shao,Tim Stelzer,Paolo Torrielli,Marco Zaro,Marco Zaro +10 more
TL;DR: MadGraph5 aMC@NLO as discussed by the authors is a computer program capable of handling all these computations, including parton-level fixed order, shower-matched, merged, in a unified framework whose defining features are flexibility, high level of parallelisation and human intervention limited to input physics quantities.
Journal ArticleDOI
The anti-$k_t$ jet clustering algorithm
TL;DR: The anti-k-t algorithm as mentioned in this paper behaves like an idealised cone algorithm, in that jets with only soft fragmentation are conical, active and passive areas are equal, the area anomalous dimensions are zero, the non-global logarithms are those of a rigid boundary and the Milan factor is universal.
Journal ArticleDOI
Event generation with SHERPA 1.1
Tanju Gleisberg,Stefan Höche,Frank Krauss,Marek Schönherr,Steffen Schumann,Frank Siegert,J. Winter +6 more
TL;DR: Sherpa as mentioned in this paper is a general-purpose tool for the simulation of particle collisions at high-energy colliders and contains a very flexible tree-level matrix-element generator for the calculation of hard scattering processes within the Standard Model and various new physics models.
Journal ArticleDOI
Event generation with SHERPA 1.1
T. Gleisberg,Stefan Hoeche,Frank Krauss,Marek Schoenherr,Steffen Schumann,Frank Siegert,J. Winter +6 more
TL;DR: Sherpa as discussed by the authors is a general-purpose tool for the simulation of particle collisions at high-energy colliders and contains a very flexible tree-level matrix-element generator for the calculation of hard scattering processes within the Standard Model and various new physics models.
Journal ArticleDOI
A general algorithm for calculating jet cross sections in NLO QCD
TL;DR: In this article, a general algorithm for calculating arbitrary jet cross sections in arbitrary scattering processes to next-to-leading accuracy in perturbative QCD is presented, based on the subtraction method.