NLO electroweak automation and precise predictions for W + multijet production at the LHC

By Stefan Kallweit, J. Lindert, P. Maierhöfer, Stefano Pozzorini, M. Schönherr. 2014

216 citations recorded by the source corpus.

A bstractWe 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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/54ccc9468891da8a1bcc1344169e358495af6287

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Nuclear and High Energy Physics

Citations in the corpus

Fully differential NNLO computations with MATRIX (2017, methodology): “uster_queue Queue/Partition of the cluster to be used for cluster submit; not required in most cases. cluster_runtime Runtime of jobs in cluster submit; not required in most cases. cluster_submit_line[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, ”
OpenLoops 2 (2019, methodology): “The original implementation [16] was applicable to any SM process at NLO QCD, and the other major novelty of OpenLoops 2 is the extension of NLO automation to the full SM [35, 36], including any correction effect of O(αs) and O(α).”
On-the-fly reduction of open loops (2017, methodology): “ k−1 +h k. This operation needs to be performed separately for all relevant helicity conﬁgurations ˆh k ∈Hˆ k = Hˆ k−1 ⊗H k and iterated for k= 1,...,N. The initial condition is N 0(I N,q,ˆh 0) = 11, (40) where ˆh 0 ∈Hˆ 0 = {0}, and the identity operator is understood as [11]β 0 β =δ β0 β . In order”
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].”
Event generation with Sherpa 2.2 (2019, background): “Processes that have already been evaluated at full EW one-loop order with a development version of SHERPA include: • three-jet production at the LHC [90], • four-lepton production [91, 16, 92], • tt̄h production [16], • W (Z) production with up to three (two) jets [93, 16], • γγW and γγZ production ”
W±Z production at the LHC: fiducial cross sections and distributions in NNLO QCD (2016, methodology): “e to the one-loop generator OpenLoops [26,45] to obtain all required (spin- and colour-correlated) tree-level and oneloop amplitudes. 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 process”
Les Houches 2015: Physics at TeV Colliders Standard Model Working Group Report (2016, methodology): “The presented predictions are based on the recently achieved automation of NLO QCD+EW calculations [163, 164], as described in Section 2.”
Collier: A fortran-based complex one-loop library in extended regularizations (2016, methodology): “ for instance e+e− → WW → 4fermions [57, 65], H → WW/ZZ → 4fermions [66, 67], pp → t¯tb¯b [68–71], pp → WWbb [72–74], pp¯ → 2ℓ+≤2j [20, 75], pp → WW → 4ℓ in double-pole approximation [76], pp → W+≤3j [19], pp → t¯tjj [77], pp → WWbbH [78], pp¯ → µ+µ−e+e− [79], and various applications with lower mul”
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].”
NLO QCD+EW predictions for V + jets including off-shell vector-boson decays and multijet merging (2015, methodology): “As demonstrated in [41], this provides an excellent approxi-”
The automation of next-to-leading order electroweak calculations (2018, result): “. Obviously, the generation of W +jets processes is fully analogous to that carried out here. NLO EW corrections to W+jets production have already appeared in the literature in various approximations [21,23,24,115{119]; we shall not compare those predictions with ours in this paper34. The contributi”
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.”