Colour rearrangement for dipole showers

  title={Colour rearrangement for dipole showers},
  author={J. Bellm},
  journal={The European Physical Journal. C, Particles and Fields},
  • J. Bellm
  • Published 18 January 2018
  • Physics
  • The European Physical Journal. C, Particles and Fields
We present an algorithm to rearrange the colour chains of dipole showers in the shower process according to the colour amplitudes of a simple matrix element. We implement the procedure in the dipole shower of Herwig and show comparisons to data. 

Spacetime colour reconnection in Herwig 7

We present a model for generating spacetime coordinates in the Monte Carlo event generator Herwig 7, and perform colour reconnection by minimizing a boost-invariant distance measure of the system. We

Future prospects for parton showers

In this brief Snowmass White Paper for the Theory Frontier, we argue that there have been important recent developments in the algorithms used to generate a simulated parton shower and that further

Cluster Hadronisation in Sherpa

We present the Sherpa cluster hadronisation model and a simple model for non-perturbative colour reconnections. Using two different parton shower implementations we tuned the model to data and we

Color matrix element corrections for parton showers

A bstractWe investigate the effects of keeping the full color structure for parton emissions in parton showers for both LEP and LHC. This is done within the Herwig 7 dipole shower, and includes gluon

Stochastically sampling color configurations

Parton shower algorithms are key components of theoretical predictions for high-energy collider physics. Work toward more accurate parton shower algorithms is thus pursued along many different

Parton showers and matching uncertainties in top quark pair production with Herwig 7

We evaluate the theoretical uncertainties in next-to-leading order plus parton shower predictions for top quark pair production and decay in hadronic collisions. Our work is carried out using the

Parton color reconnection in Herwig 7 using a spacetimeevent topology

Herwig 7 is a general-purpose Monte Carlo generator of particle collisions comprising both hard perturbative as well as soft phenomenological physics. Herwig is therefore capable to describe the

Prepared for submission to JHEP LU-TP 18-21 , MCNET-18-14 , UWTHPH-2018-21 Color matrix element corrections for parton showers

We investigate the effects of keeping the full color structure for parton emissions in parton showers for both LEP and LHC. This is done within the Herwig 7 dipole shower, and includes gluon

A comprehensive guide to the physics and usage of PYTHIA 8.3

This manual describes the Pythia event generator, the most recent version of an evolving physics tool used to answer fundamental questions in particle physics. The program is most often used to

High dimensional parameter tuning for event generators

An algorithm is presented that allows to tune Monte Carlo Event Generators for high dimensional parameter spaces and is tested in ideal conditions and in real life examples including tuning of the event generators Herwig 7 and Pythia 8 for LEP observables.



The midpoint between dipole and parton showers

We present a new parton-shower algorithm. Borrowing from the basic ideas of dipole cascades, the evolution variable is judiciously chosen as the transverse momentum in the soft limit. This leads to a

A Parton shower algorithm based on Catani-Seymour dipole factorisation

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

Coherent parton showers with local recoils

We outline a new formalism for dipole-type parton showers which maintain exact energy-momentum conservation at each step of the evolution. Particular emphasis is put on the coherence properties, the

Subleading Nc improved parton showers

A bstractWe describe an algorithm for improving subsequent parton shower emissions by full SU(3) color correlations in the framework of a dipole-type shower. As a proof of concept, we present results

ColorFull: a C++ library for calculations in SU(Nc) color space

ColorFull, a C++ package for treating QCD color structure, is presented. ColorFull, which utilizes the trace basis approach, is intended for interfacing with event generators, but can also be used as