MadGraph/MadEvent v4: The New Web Generation

• Published in: arXiv.org 2007-06
• Main Authors: Alwall, Johan, Demin, Pavel, de Visscher, Simon, Frederix, Rikkert, Herquet, Michel, Maltoni, Fabio, Plehn, Tilman, Rainwater, David L, Stelzer, Tim
• Format: Article
• Language: English
• Subjects: Computer simulation; Data analysis; Leptons; Pair production; Physics; Signal processing; Standard model (particle physics)
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.0706.2334

We present the latest developments of the MadGraph/MadEvent Monte Carlo event generator and several applications to hadron collider physics. In the current version events at the parton, hadron and detector level can be generated directly from a web interface, for arbitrary processes in the Standard Model and in several physics scenarios beyond it (HEFT, MSSM, 2HDM). The most important additions are: a new framework for implementing user-defined new physics models; a standalone running mode for creating and testing matrix elements; generation of events corresponding to different processes, such as signal(s) and backgrounds, in the same run; two platforms for data analysis, where events are accessible at the parton, hadron and detector level; and the generation of inclusive multi-jet samples by combining parton-level events with parton showers. To illustrate the new capabilities of the package some applications to hadron collider physics are presented: 1) Higgs search in pp \to H \to W^+W^-: signal and backgrounds. 2) Higgs CP properties: pp \to H jj$in the HEFT. 3) Spin of a new resonance from lepton angular distributions. 4) Single-top and Higgs associated production in a generic 2HDM. 5) Comparison of strong SUSY pair production at the SPS points. 6) Inclusive W+jets matched samples: comparison with the Tevatron data.