Helicity-dependent showers and matching with VINCIA

@inproceedings{Larkoski2013HelicitydependentSA,
  title={Helicity-dependent showers and matching with VINCIA},
  author={Andrew J. Larkoski and Juan J. Lopez-Villarejo and Peter Skands},
  year={2013}
}
We present an antenna-shower formalism that includes helicity dependence for massless partons. The formalism applies to both traditional (global) showers and to sector-based variants. We combine the shower with VINCIA's multiplicative approach to matrix-element matching, generalized to operate on each helicity configuration separately. The result is a substantial gain in computational speed for high parton multiplicities. We present an implementation of both sector and global showers, with min… 

Helicity antenna showers for hadron colliders

We present a complete set of helicity-dependent $$2\rightarrow 3$$2→3 antenna functions for QCD initial- and final-state radiation. The functions are implemented in the Vincia shower Monte Carlo

Sector showers for hadron collisions

In conventional parton showers (including ones based on dipoles/antennae), a given (Born + m )-parton configuration can typically be reached via O ( m !) different “shower histories”. In the context

The Vincia parton shower

We summarize recent developments in the VINCIA parton shower. After a brief review of the basics of the formalism, the extension of VINCIA to hadron collisions is sketched. We then turn to

Interleaved resonance decays and electroweak radiation in the Vincia parton shower

We propose a framework for high-energy interactions in which resonance decays and electroweak branching processes are interleaved with the QCD evolution in a single common sequence of decreasing

VINCIA1 for Hadron Colliders

We present the first public implementation of antenna-based QCD initialand finalstate showers. The shower kernels are 2 → 3 antenna functions, which capture not only the collinear dynamics but also

VINCIA 1 for Hadron Colliders

We present the first public implementation of antenna-based QCD initial- and finalstate showers. The shower kernels are 2 ! 3 antenna functions, which capture not only the collinear dynamics but also

Antenna showers with one-loop matrix elements

A bstractWe consider the probability for a colour-singlet $ q\overline{q} $ pair to emit a gluon, in strongly and smoothly ordered antenna showers. We expand to second order in αs and compare to the

Interleaved Resonance Decays and Electroweak Radiation in Vincia

We propose a framework for high-energy interactions in which resonance decays and electroweak branching processes are interleaved with the QCD evolution in a single common sequence of decreasing

Collinear electroweak radiation in antenna parton showers

We present a first implementation of collinear electroweak radiation in the Vincia parton shower. Due to the chiral nature of the electroweak theory, explicit spin dependence in the shower algorithm

VINCIA for hadron colliders

The first public implementation of antenna-based QCD initial- and final-state showers are presented, which capture not only the collinear dynamics but also the leading soft (coherent) singularities of QCD matrix elements.

References

SHOWING 1-10 OF 76 REFERENCES

Spin-dependent antenna splitting functions

We consider parton showers based on radiation from QCD dipoles or ``antennas''. These showers are built from $2\ensuremath{\rightarrow}3$ parton splitting processes. The question then arises of what

Antenna Showers with Hadronic Initial States

A Simple shower and matching algorithm

We present a simple formalism for parton-shower Markov chains. As a first step towards more complete ''uncertainty bands,'' we incorporate a comprehensive exploration of the ambiguities inherent in

Interleaved parton showers and tuning prospects

General-purpose Monte Carlo event generators have become important tools in particle physics, allowing the simulation of exclusive hadronic final states. In this article we examine the Pythia 8

QCD Matrix Elements + Parton Showers

We propose a method for combining QCD matrix elements and parton showers in Monte Carlo simulations of hadronic flnal states in e + e i annihilation. The matrix element and parton shower domains are

Some remarks on dipole showers and the DGLAP equation

It has been argued recently that parton showers based on color dipoles conflict with collinear factorization and do not lead to the correct Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP)

Matching matrix elements and shower evolution for top-pair production in hadronic collisions

We study the matching of multijet matrix elements and shower evolution in the case of top production in hadronic collisions at the Tevatron and at the LHC. We present the results of the matching

Antenna showers with one-loop matrix elements

A bstractWe consider the probability for a colour-singlet $ q\overline{q} $ pair to emit a gluon, in strongly and smoothly ordered antenna showers. We expand to second order in αs and compare to the

Higher-order corrections to timelike jets

We present a simple formalism for the evolution of timelike jets in which tree-level matrix element corrections can be systematically incorporated, up to arbitrary parton multiplicities and over all

Efficient matrix-element matching with sector showers

An implementation in the publicly available Vincia plug-in to the Pythia 8 event generator, for hadronic Z0 decays including tree-level matrix elements through $ \mathcal{O}\alpha_s^4 $ and total rates can be augmented to NLO precision in a straightforward way.
...