A Parton shower algorithm based on Catani-Seymour dipole factorisation

By Steffen Schumann, F. Krauss. 2007

1,308 citations recorded by the source corpus.

In this publication the implementation of a new parton shower model based on the Catani-Seymour dipole factorisation, as first suggested by [1,?2], is discussed. First results obtained with the new algorithm are compared with experimental data.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/84aa0a99bf66b1f7b51df7c772c50b6dbd19b0e1

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In Nuclear and High Energy Physics

1. Atlas Collaboration
2. Cms Collaboration
3. Gudrun Heinrich
4. M. Schönherr
5. Fabio Maltoni
6. Ansgar Denner
7. Stefan Dittmaier
8. A. Larkoski

Citations in the corpus

• Les Houches 2013: Physics at TeV Colliders: Standard Model Working Group Report (2014, background): “It is important to note that any lepton dressing can be performed on Monte Carlo generator level only, i.e. experimental measurements can be unfolded to various levels of QED FSR corrections based on the QED FSR code and EW parameter settings as implemented in the used Monte Carlos.”
• QCD matrix elements + parton showers. The NLO case (2012, methodology): “We employ a parton shower based on Catani-Seymour dipole factorisation [57] and the related MC@NLO generator [40] to generate events at the parton shower level.”
• Search for electroweak production of supersymmetric states in scenarios with compressed mass spectra at √s = 13 TeV with the ATLAS detector (2017, positive): “NLO and up to four partons at LO using COMIX [74] and OPENLOOPS [75], and merged with the SHERPA parton shower [76] according to the ME+PS@NLO prescription [77].”
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations (2014, background): “110) is therefore valid not only for those PSMCs based on a 1 → 2 branching picture (such as those just mentioned), but more generally for any PSMC consistent with QCD (in particular, those that adopt a dipole picture [34,176–182]).”
• Search for dark matter and other new phenomena in events with an energetic jet and large missing transverse momentum using the ATLAS detector (2017, methodology): “Matrix elements (ME) are calculated for up to two partons at NLO and four partons at LO using OpenLoops [57] and Comix [58], and merged with the Sherpa parton shower (PS) [59] using the ME+PS@NLO prescription [60].”
• String formation beyond leading colour (2015, methodology): “ones based on QCD dipoles [13–19]), and better techniques for how to combine them (matching and merging, see [3,12,20–22] and references therein).”
• Hard photon production and matrix-element parton-shower merging (2009, methodology): “In this appendix we derive alternative splitting kinematics for dipole-like parton showers in the spirit of [30].”
• NLO matrix elements and truncated showers (2010, methodology): “The precise setup of SHERPA for this comparison, including in particular a parton shower based on Catani-Seymour subtraction terms [22] and an automated implementation of the Catani-Seymour subtraction method [23] in the matrix-element generator AMEGIC++ [24] was described in detail in our parallel ”
• Event generation with Sherpa 2.2 (2019, methodology): “In contrast to the original formulation [17], where the kinematics of the Catani– Seymour formalism is used, in the current default configuration recoil from the emission is either compensated by the spectator if the emitter is a final-state parton, or otherwise distributed equally among all final-s”
• Search for the standard model Higgs boson produced in association with top quarks and decaying into a bb¯ pair in pp collisions at √s=13 TeV with the ATLAS detector (2018, methodology): “The matrix elements were calculated for up to two partons at NLO and four partons at leading order (LO) using COMIX [78] and OPENLOOPS, and merged with the SHERPA parton shower [79] using the ME+PS@NLO prescription [80].”
• General-purpose event generators for LHC physics (2011, methodology): “In its original formulation presented in [54], the recoil strategy for the various types of dipole splittings closely followed the choice of the Catani– Seymour formalism [19, 20].”
• Jet substructure at the Tevatron and LHC: new results, new tools, new benchmarksReport prepared by the participants of the BOOST 2011 Workshop at Princeton University, 22–26 May 2011. L Asquith (lasquith@hep.anl.gov), S Rappoccio (rappocc@fnal.gov) and C K Vermilion (verm@uw.edu), editors. (2011, background): “The matrix elements of varying multiplicity are consistently combined to form inclusive samples of fully exclusive events through subsequent parton shower evolution [73] before being subjected to hadronization.”
• Search for additional heavy neutral Higgs and gauge bosons in the ditau final state produced in 36 fb−1 of pp collisions at s=13$$ \sqrt{s}=13 $$ TeV with the ATLAS detector (2018, methodology): “with the Sherpa parton shower [102] using the ME+PS@NLO prescription [103].”
• Coherent parton showers with local recoils (2009, methodology): “One choice, which so far has been implemented [57, 58] is to invert the kinematic mappings as derived in [59].”