New formalism for QCD parton showers

By S. Gieseke, P. Stephens, Bryan R. Webber. 2003

240 citations recorded by the source corpus.

We present a new formalism for parton shower simulation of QCD jets, which incorporates the following features: covariant kinematics, improved treatment of heavy quark fragmentation, angular-ordered evolution with soft gluon coherence, more accurate soft gluon angular distributions, and better coverage of phase space. It is implemented in the new Herwig++ event generator.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/0cacb74e5c484bf1ce87d0d5f015761e9a870d19

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In Nuclear and High Energy Physics

Citations in the corpus

Les Houches 2015: Physics at TeV Colliders Standard Model Working Group Report (2016, methodology): “2 Herwig The Herwig 7 event generator [382] is currently offering two shower modules: the traditional, angular ordered parton shower as set out in [496], as well as a dipole-type shower based on the work presented in [383,384].”
A new method to distinguish hadronically decaying boosted Z bosons from W bosons using the ATLAS detector (2015, unknown): “Additional samples are produced with HERWIG++ [14], which uses angular ordering of the parton showers [15], a cluster model for hadronization [16], as well as the EE3 [17] underlyingevent tune.”
Parton Shower Uncertainties in Jet Substructure Analyses with Deep Neural Networks (2016, methodology): “The default HERWIG shower (known as QTilde) is based on 1 → 2 splittings using the DGLAP equations, with an angular ordering criterion [59].”
Coherent parton showers with local recoils (2009, background): “The classical parton showers with 1 → 2 like branchings themselves have been rewritten and reformulated in order to take into account mass effects and improve the phase space coverage [8] or to incorporate intertwined interactions with partons from additional hard interactions in the underlying even”
Les Houches 2017: Physics at TeV Colliders Standard Model Working Group Report (2017, methodology): “Both generators provide an option for using different shower modules, however at this stage of the project we only use default parton showers algorithms5: the angular ordered shower in HERWIG [702] and p⊥-ordered shower in PYTHIA [1013].”
General-purpose event generators for LHC physics (2011, background): “The parton shower in Herwig++ is based on a new evolution variable q̃ [263], motivated from the branching of gluons off heavy quarks [20].”
Jet substructure at the Large Hadron Collider: A review of recent advances in theory and machine learning (2017, background): “Examples include Pythia [142, 143, 144], a pT -ordered dipole shower; Vincia [145, 146, 147], Sherpa [148, 149], Ariadne [150, 151], and DIRE [152], dipole-antenna showers; Herwig++/Herwig7 [153, 154, 155, 156, 157, 158], an angular-ordered dipole shower; Deductor [159, 160, 161, 162, 163, 164, 165]”
Herwig 7.0/Herwig++ 3.0 release note (2015, methodology): “The program, with the help of external libraries used for amplitude calculation, is now able fully automatically to assemble NLO QCD corrections to virtually all Standard Model processes, including matching to both of its partonshower algorithms [16,17], via methods inspired by either the MC@NLO [18”
Herwig++ physics and manual (2008, methodology): “In the approach of [20], for the simulation of QCD radiation in particle decays, the recoil due to the radiation emitted from the decaying particle is absorbed by its final-state colour partner.”
The midpoint between dipole and parton showers (2015, unknown): “More recently, the traditional approaches implemented in Herwig [3,4], Pythia [5,6] and Sherpa [7,8] were supplemented by methods based on dipole and antenna factorization [9–17].”
Simulation of multiple partonic interactions in Herwig (2008, unknown): “[42], which is based on the original coherent shower algorithm of Refs.”
A perturbative framework for jet quenching (2012, background): “The latter resum the dominant collinear logarithms associated to the emission of additional partons to leading (and partly sub-leading) logarithmic accuracy, with many improvements and reformulations in the past decades [5–13].”
A new method for combining NLO QCD with shower Monte Carlo algorithms (2004, methodology): “[4, 5]) would require computing again both the modified NLO expression and the subtraction term.”
QCD matrix elements + parton showers. The NLO case (2012, methodology): “This is the case for example in HERWIG, where the evolution is formulated in terms of generalised relative angles [49,50].”