An improved description of hadronization in the QCD cluster model for e+e− annihilation

Gottschalk, Thomas D.

doi:10.1016/0550-3213(84)90253-0

Cited by 46 publications

(18 citation statements)

References 38 publications

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“…AHADIC is SHERPA's hadronisation package for translating the partons (quarks and gluons) into primordial hadrons. The algorithm is based on the cluster-fragmentation ideas presented in [36], which are also implemented in the HERWIG event generators. It should be noted that AHADIC, essentially based on [37], indeed differs from the original versions, cf.…”

Section: Physics Modulesmentioning

confidence: 99%

“…For a long time, for the hadronisation of partons, SHERPA has relied on the implementation of the Lund string model [106] in PYTHIA, accessible through a corresponding interface. Since version 1.1, SHERPA employs its own module AHADIC [107], which implements a cluster-hadronisation model as described in [36] and extended by ideas presented in [37]. The basic assumption underlying this class of models is local parton-hadron duality, i.e.…”

Section: Cluster-hadronisation Modelmentioning

confidence: 99%

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Event generation with SHERPA 1.1

Gleisberg

Höche

Krauss

et al. 2009

J. High Energy Phys.

1,936

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: Physics Modulesmentioning

confidence: 99%

Section: Cluster-hadronisation Modelmentioning

confidence: 99%

Event generation with SHERPA 1.1

Gleisberg

Höche

Krauss

et al. 2009

J. High Energy Phys.

1,936

1,820

View full text Add to dashboard Cite

show abstract

“…Hadronization models play an essential role in the description of hadronic events in highenergy collisions, connecting the short-distance physics of quarks and gluons with the observable world of colourless (long-lived) hadrons via a dynamical process that enforces confinement. The two major models of hadronization used in proton-proton event generation are the Lund string model [1][2][3][4] and the cluster model [5][6][7], with the former implemented in Pythia [8][9][10] and Epos [11,12], and the latter in Herwig [13][14][15] and Sherpa [16,17].…”

Section: Introductionmentioning

confidence: 99%

Fragmentation of two repelling Lund strings

Duncan

2020

SciPost Phys.

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Motivated by recent discoveries of flow-like effects in pp collisions, and noting that multiple string systems can form and hadronize simultaneously in such collisions, we develop a simple model for the repulsive interaction between two Lund strings with a positive (colour-oriented) overlap in rapidity. The model is formulated in momentum space and is based on a postulate of a constant net transverse momentum being acquired per unit of overlap along a common rapidity direction. To conserve energy, the strings shrink in the longitudinal direction, essentially converting a portion of the string invariant mass m^2m2 into p_\perp^2p⊥2 for constant m_\perp^2 = m^2 + p_\perp^2m⊥2=m2+p⊥2 for each string. The reduction in string invariant mass implies a reduced overall multiplicity of produced hadrons; the increase in p_\perp^2p⊥2 is local and only affects hadrons in the overlapping region. Starting from the simplest case of two symmetric and parallel strings with massless endpoints, we generalize to progressively more complicated configurations. We present an implementation of this model in the Pythia event generator and use it to illustrate the effects on hadron p_\perpp⊥ distributions and dihadron azimuthal correlations, contrasting it with the current version of the “shoving” model implemented in the same generator.

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“…Hadronization models play an essential role in the description of hadronic events in high-energy collisions, connecting the short-distance physics of quarks and gluons with the observable world of colourless (long-lived) hadrons via a dynamical process that enforces confinement. The two major models of hadronization used in proton-proton event generation are the Lund string model [1][2][3][4] and the cluster model [5][6][7], with the former implemented in Pythia [8][9][10] and Epos [11,12], and the latter in Herwig [13][14][15] and Sherpa [16,17].…”

mentioning

confidence: 99%

Fragmentation of Two Repelling Lund Strings

Duncan,

Skands

2019

Preprint

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Motivated by recent discoveries of flow-like effects in pp collisions, and noting that multiple string systems can form and hadronize simultaneously in such collisions, we develop a simple model for the repulsive interaction between two QCD strings with a positive (colour-oriented) overlap in rapidity. The model is formulated in momentum space and is based on a postulate of a constant net transverse momentum being acquired per unit of overlap along a common rapidity direction. To conserve energy, the strings shrink in the longitudinal direction, essentially converting m 2 to p 2 ⊥ for constant m 2 ⊥ = m 2 + p 2 ⊥ for each string. The reduction in m 2 implies a reduced overall multiplicity of produced hadrons; the increase in p 2 ⊥ is local and only affects hadrons in the overlapping region. Starting from the simplest case of two symmetric and parallel strings with massless endpoints, we generalize to progressively more complicated configurations. We present an implementation of this model in the Pythia event generator and use it to illustrate the effects on hadron p ⊥ distributions and dihadron azimuthal correlations, contrasting it with the current version of the "shoving" model implemented in the same generator. Contents

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An improved description of hadronization in the QCD cluster model for e+e− annihilation

Cited by 46 publications

References 38 publications

Event generation with SHERPA 1.1

Event generation with SHERPA 1.1

Fragmentation of two repelling Lund strings

Fragmentation of Two Repelling Lund Strings

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