SUSY Les Houches Accord 2
B. C. Allanach, C. Balazs, G. Belanger, M. Bernhardt, F. Boudjema, D. Choudhury, K. Desch, U. Ellwanger, P. Gambino, R. Godbole, T. Goto, J. Guasch, M. Guchait, T. Hahn, S. Heinemeyer, C. Hugonie, T. Hurth, S. Kraml S. Kreiss, J. Lykken, F. Moortgat, S. Moretti, S. Penaranda, T. Plehn, W. Porod, A. Pukhov, P. Richardson, M. Schumacher, L. Silvestrini, P. Skands, P. Slavich, M. Spira, G. Weiglein, P. Wienemann
TL;DR
SUSY Les Houches Accord 2 (SLHA2) generalizes SLHA1 to cover CP violation, R-parity violation, flavour violation, and the NMSSM, establishing a unified, code-interoperable framework for SUSY spectra and decays. It defines explicit bases (super-CKM/PMNS), extended mass/mixing matrices, and new input/output blocks to accommodate broader model spaces while preserving backward compatibility. The document proposes concrete MODSEL switches and block schemas (EXTPAR, QEXTPAR, RV*, NMSSM blocks) to ensure consistent parameter definitions, scale handling, and PDG-code assignments across tools. By detailing flavour, RPV, CP, and NMSSM conventions, SLHA2 aims to streamline multi-code workflows and enable robust comparisons across spectrum, decay, and collider-phenomenology packages. Practical adoption relies on community testing and the integration of these conventions into existing SUSY toolchains.
Abstract
The Supersymmetry Les Houches Accord (SLHA) provides a universal set of conventions for conveying spectral and decay information for supersymmetry analysis problems in high energy physics. Here, we propose extensions of the conventions of the first SLHA to include various generalisations: the minimal supersymmetric standard model with violation of CP, R-parity, and flavour, as well as the simplest next-to-minimal model.