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SUSY Les Houches Accord: Interfacing SUSY Spectrum Calculators, Decay Packages, and Event Generators

P. Skands, B. C. Allanach, H. Baer, C. Balázs, G. Bélanger, F. Boudjema, A. Djouadi, R. Godbole, J. Guasch, S. Heinemeyer, W. Kilian, J-L. Kneur, S. Kraml, F. Moortgat, S. Moretti, M. Mühlleitner, W. Porod, A. Pukhov, P. Richardson, S. Schumann, P. Slavich, M. Spira, G. Weiglein

TL;DR

The paper addresses the fragmentation of SUSY-tools by introducing the SUSY Les Houches Accord (SLHA), a universal interface that standardizes data exchange between spectrum calculators, decay packages, and event generators via three ASCII files. It defines detailed block-based conventions for model inputs, mass spectra, mixing matrices, running couplings, and decay information, enabling seamless interoperability across languages and platforms. By providing explicit block definitions, formatting rules, and translation notes between DRbar and MSbar schemes, the Accord reduces integration effort and promotes consistency across the SUSY phenomenology toolchain. The work anticipates future extensions to accommodate RPV, CP violation, and NMSSM, aiming for broad community adoption and long-term compatibility across evolving SUSY calculations.

Abstract

An accord specifying a unique set of conventions for supersymmetric extensions of the Standard Model together with generic file structures for 1) supersymmetric model specifications and input parameters, 2) electroweak scale supersymmetric mass and coupling spectra, and 3) decay tables is defined, to provide a universal interface between spectrum calculation programs, decay packages, and high energy physics event generators.

SUSY Les Houches Accord: Interfacing SUSY Spectrum Calculators, Decay Packages, and Event Generators

TL;DR

The paper addresses the fragmentation of SUSY-tools by introducing the SUSY Les Houches Accord (SLHA), a universal interface that standardizes data exchange between spectrum calculators, decay packages, and event generators via three ASCII files. It defines detailed block-based conventions for model inputs, mass spectra, mixing matrices, running couplings, and decay information, enabling seamless interoperability across languages and platforms. By providing explicit block definitions, formatting rules, and translation notes between DRbar and MSbar schemes, the Accord reduces integration effort and promotes consistency across the SUSY phenomenology toolchain. The work anticipates future extensions to accommodate RPV, CP violation, and NMSSM, aiming for broad community adoption and long-term compatibility across evolving SUSY calculations.

Abstract

An accord specifying a unique set of conventions for supersymmetric extensions of the Standard Model together with generic file structures for 1) supersymmetric model specifications and input parameters, 2) electroweak scale supersymmetric mass and coupling spectra, and 3) decay tables is defined, to provide a universal interface between spectrum calculation programs, decay packages, and high energy physics event generators.

Paper Structure

This paper contains 24 sections, 24 equations, 1 figure, 2 tables.

Table of Contents

  1. Introduction
  2. Using the Accord
  3. Conventions
  4. Standard Model Parameters
  5. Supersymmetric Parameters
  6. SUSY Breaking Parameters
  7. Mixing Matrices
  8. Neutralino Mixing
  9. Chargino Mixing
  10. Sfermion Mixing
  11. Higgs Mixing
  12. Running Couplings
  13. Definitions of the Interfaces
  14. The Model Input File
  15. The Spectrum File
  16. ...and 9 more sections

Figures (1)

  • Figure 1: Stages of the interface Accord. By SUSY scenario we not only intend specific SUSY--breaking mechanisms, such as supergravity (SUGRA), gauge mediated SUSY breaking (GMSB), etc., but also more general setups within the Minimal Supersymmetric Standard Model (MSSM).