SuperIso v2.3: A program for calculating flavor physics observables in supersymmetry

Abstract

We describe SuperIso v2.3 which is a public program for evaluation of flavor physics observables in the minimal supersymmetric extension of the Standard Model (MSSM). SuperIso v2.3, in addition to the isospin asymmetry of B → K ∗ γ , which was the main purpose of the first version, incorporates new flavor observables such as the branching ratio of B s → μ + μ − , the branching ratio of B → τ ν τ , the branching ratio of B → D τ ν τ and the branching ratio of K → μ ν μ . The calculation of the branching ratio of B → X s γ is also improved in this version, as it now includes NNLO Standard Model contributions in addition to partial NLO supersymmetric contributions. The program also computes the muon anomalous magnetic moment ( g − 2 ) . Four sample models are included in the package, namely mSUGRA, NUHM, AMSB and GMSB. SuperIso uses a SUSY Les Houches Accord file (SLHA1 or SLHA2) as input, which can be either generated automatically by the program via a call to external spectrum calculators, or provided by the user. The calculation of the observables is detailed in the Appendices, where a suggestion for the allowed intervals for each observable is also provided. Program summary Program title: SuperIso Catalogue identifier: AEAN_v2_0 Program summary URL: http://cpc.cs.qub.ac.uk/summaries/AEAN_v2_0.html Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland Licensing provisions: GNU General Public Licence No. of lines in distributed program, including test data, etc.: 5977 No. of bytes in distributed program, including test data, etc.: 39 375 Distribution format: tar.gz Programming language: C (C99 Standard compliant) Computer: 32- or 64-bit PC, Mac Operating system: Linux, MacOS RAM: less than 1 Mb Classification: 11.6 Catalogue identifier of previous version: AEAN_v1_0 Journal reference of previous version: Comput. Phys. Comm. 178 (2008) 745 External routines: ISASUGRA/ISAJET and/or SOFTSUSY Does the new version supersede the previous version?: yes Nature of problem: Calculation of flavor physics observables as well as the muon anomalous magnetic moment in the Minimal Supersymmetric Standard Model with minimal flavor violation, in order to derive constraints on the supersymmetric parameter space. Solution method: SuperIso uses a SUSY Les Houches Accord file, which can be either generated automatically via a call to SOFTSUSY or ISAJET, or provided by the user. This file contains the masses and couplings of the supersymmetric particles. SuperIso then computes the most constraining flavor physics observables and the muon ( g − 2 ). SuperIso is able to perform the calculations in different supersymmetry breaking scenarios, such as mSUGRA, NUHM, AMSB and GMSB. Reasons for new version: This new version incorporates the calculation of several additional observables, and the inclusive branching ratio of b → s γ is now computed at NNLO accuracy for the Standard Model. The implemented routines are therefore extensively modified. Summary of revisions: • Compatibility with the SLHA2 input file format • Implementation of the calculation of the muon anomalous magnetic moment • Implementation of observables related to leptonic and semi-leptonic B meson decays • Implementation of observables related to K meson decays • Improvement of the calculations of the branching ratio of b → s γ (now at NNLO accuracy) and the isospin asymmetry of B → K ∗ γ • Update of parameters to their latest values Unusual features: The code is very modular, and new routines for calculating new observables can be easily added. Running time: less than 1 sec