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A comprehensive approach to new physics simulations

Neil D. Christensen, Priscila de Aquino, Celine Degrande, Claude Duhr, Benjamin Fuks, Michel Herquet, Fabio Maltoni, Steffen Schumann

TL;DR

The paper presents a unified, modular framework based on FeynRules that converts any perturbative Lagrangian-based BSM model into automatically compatible outputs for multiple Monte Carlo and symbolic tools. By enabling seamless model-building, cross-generator validation, and direct transfer to experimental workflows, it addresses the fragmentation and traceability issues common in BSM simulations. The authors demonstrate the approach across a suite of representative models (SM, 2HDM, MSSM, Higgsless, LED, MUED, EFTs) with comprehensive validation, highlighting improved reproducibility and flexibility for collider phenomenology. This framework holds promise for accelerating BSM studies and facilitating near-term integration of new models into LHC analyses and, potentially, automatic NLO extensions.

Abstract

We describe a framework to develop, implement and validate any perturbative Lagrangian-based particle physics model for further theoretical, phenomenological and experimental studies. The starting point is FeynRules, a Mathematica package that allows to generate Feynman rules for any Lagrangian and then, through dedicated interfaces, automatically pass the corresponding relevant information to any supported Monte Carlo event generator. We prove the power, robustness and flexibility of this approach by presenting a few examples of new physics models (the Hidden Abelian Higgs Model, the general Two-Higgs-Doublet Model, the most general Minimal Supersymmetric Standard Model, the Minimal Higgsless Model, Universal and Large Extra Dimensions, and QCD-inspired effective Lagrangians) and their implementation/validation in FeynArts/FormCalc, CalcHep, MadGraph/MadEvent, and Sherpa.

A comprehensive approach to new physics simulations

TL;DR

The paper presents a unified, modular framework based on FeynRules that converts any perturbative Lagrangian-based BSM model into automatically compatible outputs for multiple Monte Carlo and symbolic tools. By enabling seamless model-building, cross-generator validation, and direct transfer to experimental workflows, it addresses the fragmentation and traceability issues common in BSM simulations. The authors demonstrate the approach across a suite of representative models (SM, 2HDM, MSSM, Higgsless, LED, MUED, EFTs) with comprehensive validation, highlighting improved reproducibility and flexibility for collider phenomenology. This framework holds promise for accelerating BSM studies and facilitating near-term integration of new models into LHC analyses and, potentially, automatic NLO extensions.

Abstract

We describe a framework to develop, implement and validate any perturbative Lagrangian-based particle physics model for further theoretical, phenomenological and experimental studies. The starting point is FeynRules, a Mathematica package that allows to generate Feynman rules for any Lagrangian and then, through dedicated interfaces, automatically pass the corresponding relevant information to any supported Monte Carlo event generator. We prove the power, robustness and flexibility of this approach by presenting a few examples of new physics models (the Hidden Abelian Higgs Model, the general Two-Higgs-Doublet Model, the most general Minimal Supersymmetric Standard Model, the Minimal Higgsless Model, Universal and Large Extra Dimensions, and QCD-inspired effective Lagrangians) and their implementation/validation in FeynArts/FormCalc, CalcHep, MadGraph/MadEvent, and Sherpa.

Paper Structure

This paper contains 57 sections, 140 equations, 2 figures, 25 tables.

Table of Contents

  1. Introduction
  2. A simple example: from the Standard Model to the Hidden Abelian Higgs Model
  3. The model
  4. From model building to phenomenology
  5. Validation of New Physics Models
  6. From phenomenology to experiment
  7. FeynRules in a nutshell
  8. Model description
  9. Running FeynRules
  10. Interfaces
  11. FeynArts/ FormCalc
  12. Model framework
  13. FeynRules interface
  14. CalcHep/ CompHep
  15. Model framework
  16. ...and 42 more sections

Figures (2)

  • Figure 1: Invariant mass distribution for the four particle final state $\gamma\gamma b\overline{b}$, both for the $gg\rightarrow h_2\rightarrow h_1 h_1\rightarrow \gamma\gamma b\overline{b}$ signal (plain) and the main SM backgrounds (dashed) events at the LHC. All simulation parameters and analysis cuts are identical to those listed in Ref. Bowen:2007ia.
  • Figure 2: A schematic "moose" diagram of the Three-Site model. The circles represent gauge groups. The two circles on the left are $SU(2)$ gauge groups while the one on the right is a $U(1)$ gauge group.