# Event generation with SHERPA 1.1

## Abstract

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-hadronization 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.

- Authors:

- Publication Date:

- Research Org.:
- Stanford Linear Accelerator Center (SLAC)

- Sponsoring Org.:
- USDOE

- OSTI Identifier:
- 944560

- Report Number(s):
- SLAC-PUB-13420

arXiv:0811.4622; TRN: US0900692

- DOE Contract Number:
- AC02-76SF00515

- Resource Type:
- Technical Report

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; FRAGMENTATION; HADRONS; MATRIX ELEMENTS; PHYSICS; QUANTUM CHROMODYNAMICS; SCATTERING; SIMULATION; SPIN; STANDARD MODEL; Phenomenology-HEP,HEPPH

### Citation Formats

```
Gleisberg, T, Hoche, Stefan, Krauss, F, Schoenherr, M, Schumann, S, Siegert, F, and Winter, J.
```*Event generation with SHERPA 1.1*. United States: N. p., 2008.
Web. doi:10.2172/944560.

```
Gleisberg, T, Hoche, Stefan, Krauss, F, Schoenherr, M, Schumann, S, Siegert, F, & Winter, J.
```*Event generation with SHERPA 1.1*. United States. doi:10.2172/944560.

```
Gleisberg, T, Hoche, Stefan, Krauss, F, Schoenherr, M, Schumann, S, Siegert, F, and Winter, J. Thu .
"Event generation with SHERPA 1.1". United States. doi:10.2172/944560. https://www.osti.gov/servlets/purl/944560.
```

```
@article{osti_944560,
```

title = {Event generation with SHERPA 1.1},

author = {Gleisberg, T and Hoche, Stefan and Krauss, F and Schoenherr, M and Schumann, S and Siegert, F and Winter, J},

abstractNote = {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-hadronization 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.},

doi = {10.2172/944560},

journal = {},

number = ,

volume = ,

place = {United States},

year = {2008},

month = {12}

}