Single top-quark production with sherpa

Bothmann, Enrico; Krauss, Frank; Schönherr, Marek

doi:10.1140/epjc/s10052-018-5696-1

Cited by 16 publications

(17 citation statements)

References 109 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the past decade, the MC@NLO matching in SHERPA has been continuously developed and refined. Specific aspects and applications have been discussed in a series of dedicated publications, including pure jet production at the LHC [115], the hadronic production of electroweak gauge bosons and up to three jets [116], ttbb production [117], s-and t-channel single-top production [118] or Higgs-boson pair production [119]. The MC@NLO approach is nowadays routinely used in Standard Model simulations with SHERPA.…”

Section: Matching Of Nlo Matrix Elements and Parton Showersmentioning

confidence: 99%

“…In Ref. [118] a dedicated SHERPA study of single-top quark production in hadronic collisions has been presented which is challenging due to the various production modes and their differing characteristics in how the final-state phase space is populated. Our study includes the consistent evaluation in the four-and fiveflavour PDF schemes and process-definition ambiguities when considering higher-order corrections, where a separation from top-quark pair production has to be defined.…”

Section: Single-top Quark Productionmentioning

confidence: 99%

“…The SHERPA predictions and experimental data agree within their respective uncertainties. For further details on the calculation and additional results, see [118]. The minimal settings to generate t-channel single-top production events at MC@NLO with SHERPA are:…”

Section: Single-top Quark Productionmentioning

confidence: 99%

See 2 more Smart Citations

Event generation with Sherpa 2.2

et al. 2019

Self Cite

View full text Add to dashboard Cite

SHERPA is a general-purpose Monte Carlo event generator for the simulation of particle collisions in high-energy collider experiments. We summarise essential features and improvements of the SHERPA 2.2 release series, which is heavily used for event generation in the analysis and interpretation of LHC Run 1 and Run 2 data. We highlight a decade of developments towards ever higher precision in the simulation of particle-collision events. Figure 1: Overview of the SHERPA 2.2 event generator framework. Interfaces/OutputsAMEGIC [6] and COMIX [7,8]. They are used for the simulation of parton-level events within the Standard Model and beyond, and for the decay of heavy resonances such as W , Z, or Higgs bosons or top quarks. Both include automated methods for efficient phase-space integration and algorithms for the subtraction of infrared divergences in calculations at next-to-leading order (NLO) in QCD [9, 10, 11] and the electroweak theory [12]. For the evaluation of virtual corrections at NLO accuracy SHERPA relies on interfaces to dedicated one-loop providers, e.g. BLACKHAT [13], OPENLOOPS [14] and RECOLA [15,16]. The default parton-showering algorithm of the SHERPA 2.2 series is the CSSHOWER [17], based on Catani-Seymour dipole factorisation [9,10,18]. As of version 2.2.0 SHERPA also features an independent second shower implementation, DIRE [19,20,21]. For the matching of NLO QCD matrix elements with parton showers SHERPA implements the MC@NLO method [22,23]. For NNLO QCD calculations the UN 2 LOPS method [24, 25] is used. The merging of multi-jet production processes at leading order [26,27,28] and next-to-leading order [29,30] is based on truncated parton showers. Multiple parton interactions are implemented via the Sjöstrand-van-Zijl model [31]. The hadronisation of partons into hadrons is modelled by a cluster fragmentation model [32]. Alternatively, in particular for uncertainty estimations, an interface to the Lund fragmentation model [33] of PYTHIA [34] is available. SHERPA provides a large library for the simulation of τ -lepton and hadron decays, including many form-factor models. Furthermore, a module for the simulation of QED final-state radiation in particle decays [35], which is accurate to first order in α for many channels is built-in. To account for spin correlations in production and subsequent decay processes the algorithm described in [36] is implemented. Events generated with SHERPA can be cast into various output formats for further processing, with the HEPMC [37] format being the most commonly used. In the specific case of parton-level events, at the leading and next-to-leading order in QCD, additional output formats are supported. They include Les Houches Event Files [38], NTUPLE files for NLO QCD events [39] and cross-section interpolation grids produced via MCGRID [40,41] in the APPLGRID [42] and FASTNLO [43,44] formats. To analyse events on-the-fly a runtime interface to the RIVET package [45] can be used conveniently.

show abstract

Section: Matching Of Nlo Matrix Elements and Parton Showersmentioning

confidence: 99%

Section: Single-top Quark Productionmentioning

confidence: 99%

See 1 more Smart Citation

Event generation with Sherpa 2.2

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…[48], respectively. Monte Carlo simulations, in which the NLO single-top production processes have been matched to a parton shower are available in the MC@NLO [45,[49][50][51][52], Sherpa [53] and POWHEG [51,54,55] frameworks. Within the latter framework, also the consistent inclusion of the single-top plus one-jet NLO matrix elements has been considered through the (extended) MINLO method [56].…”

Section: Introductionmentioning

confidence: 99%

Precise predictions for single-top production: the impact of EW corrections and QCD shower on the t-channel signature

Frederix

Pagani

Tsinikos

2019

J. High Energ. Phys.

View full text Add to dashboard Cite

In this work we calculate and provide precise predictions for the signature that is typically exploited at the LHC for the measurement of t-channel single-top production: 1 lepton, 1 light jet, 1 b-jet, / E T and no additional jets or leptons. We apply the cuts that define the fiducial region and we take into account all the contributions to this signature; not only those from resonant t-channel single-top production. On the one hand, we calculate the complete-NLO corrections, i.e., all NLO effects of QCD and EW origin. On the other hand, we study in detail the impact of a QCD parton shower for the fiducial region we consider. We provide predictions in different approximations at the inclusive level and for several differential distributions. Our study demonstrates the relevance of both EW corrections and shower effects for obtaining precise and reliable theoretical predictions for the single-top-production fiducial region.

show abstract

“…Finally, single top production is one of the interesting channels to look for new physics beyond the Standard Model [12][13][14][15]. Extensive studies of single top production at hadron colliders including radiative corrections have been performed at NLO [16][17][18][19][20][21][22][23][24] and NNLO [25][26][27] in the strong coupling. Furthermore, NLO calculations of single top production matched with parton showers become available within MC@NLO [28,29] and POWHEG [30,31].…”

Section: Introductionmentioning

confidence: 99%

Probing anomalous Wtb couplings at the LHC in single t -channel top quark production

Jueid

2018

Phys. Rev. D

View full text Add to dashboard Cite

We study the sensitivity of certain observables to the anomalous right tensorial coupling in single top production at the LHC at √ s = 13 TeV. The observables consist of asymmetries constructed from the energy and angles of the decay products of the top quark produced in single top production through t-channel. The computation is done at Leading Order (LO) and Next-to-Leading Order (NLO) in the strong coupling in the 5 flavor scheme. We have estimated projected limits on the anomalous coupling, both at the parton level without cuts and at the particle level with cuts. We find that the asymmetries are robust with respect to the higher order QCD corrections and are indeed a very good probe of this anomalous coupling of the top. Hence they can be be used as experimental probes of the same.

show abstract

Single top-quark production with sherpa

Cited by 16 publications

References 109 publications

Event generation with Sherpa 2.2

Event generation with Sherpa 2.2

Precise predictions for single-top production: the impact of EW corrections and QCD shower on the t-channel signature

Probing anomalous Wtb couplings at the LHC in single t -channel top quark production

Contact Info

Product

Resources

About