Simulation of photon-photon interactions in hadron collisions with Sherpa

Archibald, J.; Gleisberg, T.; Höche, Stefan; Krauss, Frank; Schönherr, Marek; Schumann, Steffen; Siegert, F.; Winter, Jan-Christopher

doi:10.1016/j.nuclphysbps.2008.07.027

Cited by 9 publications

(11 citation statements)

References 43 publications

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“…The EPA relates the hadronic cross section to the interaction cross section of real photons through a two-photon luminosity function [46]. The corresponding implementation in SHERPA has been described in some detail in [47].…”

Section: Beam Spectramentioning

confidence: 99%

Event generation with SHERPA 1.1

Gleisberg

Höche

Krauss

et al. 2009

J. High Energy Phys.

1,934

1,820

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In this paper the current release of the Monte Carlo event generator Sherpa, version 1.1, is presented. Sherpa is a general-purpose tool for the simulation of particle collisions at high-energy colliders. It 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. The emission of additional QCD partons off the initial and final states is described through a parton-shower model. To consistently combine multi-parton matrix elements with the QCD parton cascades the approach of Catani, Krauss, Kuhn and Webber is employed. A simple model of multiple interactions is used to account for underlying events in hadron-hadron collisions. The fragmentation of partons into primary hadrons is described using a phenomenological cluster-hadronisation model. A comprehensive library for simulating tau-lepton and hadron decays is provided. Where available form-factor models and matrix elements are used, allowing for the inclusion of spin correlations; effects of virtual and real QED corrections are included using the approach of Yennie, Frautschi and Suura.

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Section: Beam Spectramentioning

confidence: 99%

Event generation with SHERPA 1.1

Gleisberg

Höche

Krauss

et al. 2009

J. High Energy Phys.

1,934

1,820

View full text Add to dashboard Cite

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“…• Laser Backscattering, where initial beam leptons are "converted" into bunch photons through Compton scattering [148,149,150]; and • equivalent photons in the Weizsäcker-Williams approximation, where the beam particles act as quasi classical sources of collinear photon fluxes [151,152,153]. By default initial beams are considered monochromatic and will directly enter the second stage, where their potential substructure is resolved.…”

Section: Initial State Radiation and Pdfsmentioning

confidence: 99%

Event generation with Sherpa 2.2

et al. 2019

Self Cite

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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.

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“…A photon can be misreconstructed as an electron if it lies close to a charged particle track or if the photon converts to e + e − after interacting with the material in front of the calorimeter. This contribution is estimated using simulated Z γ MC events generated with SHERPA 1.4.0 [41].…”

Section: Data and Monte Carlo Modellingmentioning

confidence: 99%

“…Monte Carlo (MC) events are processed through the full detector simulation [42] using geant4 [43], and their reconstruction is performed with the same software used to reconstruct data events. Correction factors for lepton reconstruction and identification efficiencies are applied to the simulation to account for differences with respect to data.…”

Section: Data and Monte Carlo Modellingmentioning

confidence: 99%

Search for WZ resonances in the fully leptonic channel using pp collisions ats=8TeVwith the ATLAS detector

Aad¹,

Abbott²,

Abdallah³

et al. 2014

Physics Letters B

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Search for WZ resonances in the fully leptonic channel using pp collisions at √ s = 8 TeV with the ATLAS detector .ATLAS Collaboration a r t i c l e i n f o a b s t r a c t A search for resonant WZ production in the ν ( , = e, μ) decay channel using 20.3 fb −1 of √ s = 8 TeV pp collision data collected by the ATLAS experiment at LHC is presented. No significant deviation from the Standard Model prediction is observed and upper limits on the production cross sections of WZ resonances from an extended gauge model W and from a simplified model of heavy vector triplets are derived. A corresponding observed (expected) lower mass limit of 1.52 (1.49) TeV is derived for the W at the 95% confidence level.

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Simulation of photon-photon interactions in hadron collisions with Sherpa

Cited by 9 publications

References 43 publications

Event generation with SHERPA 1.1

Event generation with SHERPA 1.1

Event generation with Sherpa 2.2

Search for WZ resonances in the fully leptonic channel using pp collisions ats=8TeVwith the ATLAS detector

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