Sherpa is a Monte Carlo event generator for simulating high-energy particle collisions. Its name refers to the Simulation of High-Energy Reactions of Particles, reflecting its role in connecting theoretical particle physics calculations with realistic experimental event samples.
The program is designed to model interactions involving hadrons, leptons and photons. It provides a framework in which short-distance particle interactions are combined with subsequent radiation, hadron formation and particle decays to produce complete simulated events.
Sherpa is used by researchers studying collider phenomenology and by experimental collaborations that require predictions for signal processes and backgrounds. Its detailed treatment of quantum chromodynamics is particularly valuable for investigations involving multiple particle jets.
An important strength is the integration of matrix-element calculations with parton shower algorithms. This allows physicists to combine precise descriptions of energetic interactions with models of additional radiation and the evolution towards observable final-state particles.
Sherpa also provides tools for incorporating higher-order perturbative corrections and systematically varying theoretical assumptions. These capabilities support comparisons between calculated predictions and measurements from particle colliders.
This is free and open source software.
Key Features
- Monte Carlo generation of high-energy collision events.
- Simulation of hadron-hadron, lepton and photon interactions.
- Automated matrix-element calculations for scattering processes.
- Parton shower algorithms for particle radiation.
- Matching of fixed-order calculations with parton showers.
- Multijet merging methods for complex final states.
- Next-to-leading-order perturbative QCD calculations.
- Hadronisation and nonperturbative event modelling.
- Multiple interaction and underlying-event models.
- Particle decay simulation and associated event information.
- Parton distribution function integration.
- Event weights and systematic uncertainty variations.
- Interfaces for external matrix elements and analysis software.
- Tools for controlling physics processes and simulation parameters.
Website: sherpa-team.gitlab.io
Support:
Developer: Tanju Gleisberg, Stefan Hoeche, Frank Krauss, Marek Schoenherr, Steffen Schumann, Frank Siegert, Jan Winter and contributors
License: GNU General Public License v3.0
Sherpa is written in C. Learn C with our recommended free books and free tutorials.
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