NLO QCD+EW predictions for V + jets including off-shell vector-boson decays and multijet merging

By Stefan Kallweit, J. Lindert, Stefano Pozzorini, M. Schönherr, P. Maierhöfer. 2015

230 citations recorded by the source corpus.

A bstractWe present next-to-leading order (NLO) predictions including QCD and electroweak (EW) corrections for the production and decay of off-shell electroweak vector bosons in association with up to two jets at the 13 TeV LHC. All possible dilepton final states with zero, one or two charged leptons that can arise from off-shell W and Z bosons or photons are considered. All predictions are obtained using the automated implementation of NLO QCD+EW corrections in the OpenLoops matrix-element generator combined with the Munich and Sherpa Monte Carlo frameworks. Electroweak corrections play an especially important role in the context of BSM searches, due to the presence of large EW Sudakov logarithms at the TeV scale. In this kinematic regime, important observables such as the jet transverse momentum or the total transverse energy are strongly sensitive to multijet emissions. As a result, fixed-order NLO QCD+EW predictions are plagued by huge QCD corrections and poor theoretical precision. To remedy this problem we present an approximate method that allows for a simple and reliable implementation of NLO EW corrections in the MePs@Nlo multijet merging framework. Using this general approach we present an inclusive simulation of vector-boson production in association with jets that guarantees NLO QCD+EW accuracy in all phase-space regions involving up to two resolved jets.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/a224e0efc3fc4329fa3fb58c93836112c3e7a15a

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In Nuclear and High Energy Physics

Citations in the corpus

Evidence for the Higgs boson decay to a bottom quark–antiquark pair (2018, methodology): “In inclusive vector boson samples, selected for this analysis, the pT(V) spectrum in data is observed to be softer than in simulated samples, as expected from higher-order electroweak corrections to the production processes [89].”
W+W− production at the LHC: fiducial cross sections and distributions in NNLO QCD (2015, methodology): “The extension of Munich and OpenLoops to deal with EW corrections [56, 57] allows for the fully automated computation of EW and QCD corrections to arbitrary SM processes at NLO accuracy.”
Electroweak radiative corrections for collider physics (2019, unknown): “• With OpenLoops [69], EW and QCD corrections have been calculated for vector-boson plus 1,2,3-jet production [70, 331], pp→ eμνeνμ̄/eeνν̄ + X [332], and pp→ μμeνejj + X [333].”
OpenLoops 2 (2019, methodology): “In this context, the automation of EW corrections in OpenLoops 2 opens the door to ubiquitous NLOQCD+NLOEW simulations in Sherpa [51, 52] and NNLOQCD+NLOEW calculations in Matrix [53].”
Event generation with Sherpa 2.2 (2019, methodology): “[138].”
Les Houches 2017: Physics at TeV Colliders Standard Model Working Group Report (2017, methodology): “V+ ≥ 2j: While fixed order NLOQCD computations of V+ ≥ 2 jet final states have been known for many years recent progress has been made for NLOEW corrections [303] including merging and showering [304,305].”
W±Z production at the LHC: fiducial cross sections and distributions in NNLO QCD (2016, methodology): “The extension of Munich and OpenLoops to deal with EW corrections [56, 57] allows for the fully automated computation of EW and QCD corrections to arbitrary SM processes at NLO accuracy.”