469 research outputs found
MadGraph/MadEvent v4: The New Web Generation
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.Comment: 38 pages, 15 figure
New developments in FeynRules
The program FeynRules is a Mathematica package developed to facilitate the
implementation of new physics theories into high-energy physics tools. Starting
from a minimal set of information such as the model gauge symmetries, its
particle content, parameters and Lagrangian, FeynRules provides all necessary
routines to extract automatically from the Lagrangian (that can also be
computed semi-automatically for supersymmetric theories) the associated Feynman
rules. These can be further exported to several Monte Carlo event generators
through dedicated interfaces, as well as translated into a Python library,
under the so-called UFO model format, agnostic of the model complexity,
especially in terms of Lorentz and/or color structures appearing in the
vertices or of number of external legs. In this work, we briefly report on the
most recent new features that have been added to FeynRules, including full
support for spin-3/2 fermions, a new module allowing for the automated
diagonalization of the particle spectrum and a new set of routines dedicated to
decay width calculations.Comment: 6 pages. Contribution to the 15th International Workshop on advanced
computing and analysis techniques (ACAT 2013), 16-21 May, Beijing, Chin
DJpsiFDC: an event generator for the process at LHC
DJpsiFDC is an event generator package for the process .
It generates events for primary leading-order processes. The package
could generate a LHE document and this document could easily be embedded into
detector simulation software frameworks. The package is produced in Fortran
codes.Comment: 10 pages, 3 figure
From Lagrangians to Events: Computer Tutorial at the MC4BSM-2012 Workshop
This is a written account of the computer tutorial offered at the Sixth
MC4BSM workshop at Cornell University, March 22-24, 2012. The tools covered
during the tutorial include: FeynRules, LanHEP, MadGraph, CalcHEP, Pythia 8,
Herwig++, and Sherpa. In the tutorial, we specify a simple extension of the
Standard Model, at the level of a Lagrangian. The software tools are then used
to automatically generate a set of Feynman rules, compute the invariant matrix
element for a sample process, and generate both parton-level and fully
hadronized/showered Monte Carlo event samples. The tutorial is designed to be
self-paced, and detailed instructions for all steps are included in this
write-up. Installation instructions for each tool on a variety of popular
platforms are also provided.Comment: 58 pages, 1 figur
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