CPsuperH2.0: An improved computational tool for Higgs phenomenology in the MSSM with explicit CP violation

We describe the Fortran code CPsuperH2.0, which contains several improvements and extensions of its predecessor CPsuperH. It implements improved calculations of the Higgs-boson pole masses, notably a full treatment of the 4 × 4 neutral Higgs propagator matrix including the Goldstone boson and a more complete treatment of threshold effects in self-energies and Yukawa couplings, improved treatments of two-body Higgs decays, some important three-body decays, and two-loop Higgs-mediated contributions to electric dipole moments. CPsuperH2.0 also implements an integrated treatment of several B-meson observables, including the branching ratios of Bs → μ+ μ-, Bd → τ+ τ-, Bu → τ ν, B → Xs γ and the latter's CP-violating asymmetry ACP, and the supersymmetric contributions to the Bs, d0 - over(B, ̄)s, d0 mass differences. These additions make CPsuperH2.0 an attractive integrated tool for analyzing supersymmetric CP and flavour physics as well as searches for new physics at high-energy colliders such as the Tevatron, LHC and linear colliders.1 1The program may be obtained from http://www.hep.man.ac.uk/u/jslee/CPsuperH.html. Program summary: Program title: CPsuperH2.0. Catalogue identifier: ADSR_v2_0. Program summary URL: http://cpc.cs.qub.ac.uk/summaries/ADSR_v2_0.html. Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland. Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html. No. of lines in distributed program, including test data, etc.: 13 290. No. of bytes in distributed program, including test data, etc.: 89 540. Distribution format: tar.gz. Programming language: Fortran 77. Computer: PC running under Linux and computers in Unix environment. Operating system: Linux. RAM: 32 Mbytes. Classification: 11.1. Catalogue identifier of the previous version: ADSR_v1_0. Journal reference of the previous version: CPC 156 (2004) 283. Does the new version supersede the previous version?: Yes. Nature of problem: The calculations of mass spectrum, decay widths and branching ratios of the neutral and charged Higgs bosons in the Minimal Supersymmetric Standard Model with explicit CP violation have been improved. The program is based on recent renormalization-group-improved diagrammatic calculations that include dominant higher-order logarithmic and threshold corrections, b-quark Yukawa-coupling resummation effects and improved treatment of Higgs-boson pole-mass shifts. The couplings of the Higgs bosons to the Standard Model gauge bosons and fermions, to their supersymmetric partners and all the trilinear and quartic Higgs-boson self-couplings are also calculated. The new implementations include a full treatment of the 4 × 4(2 × 2) neutral (charged) Higgs propagator matrix together with the center-of-mass dependent Higgs-boson couplings to gluons and photons, two-loop Higgs-mediated contributions to electric dipole moments, and an integrated treatment of several B-meson observables. Solution method: One-dimensional numerical integration for several Higgs-decay modes, iterative treatment of the threshold corrections and Higgs-boson pole masses, and the numerical diagonalization of the neutralino mass matrix. Reasons for new version: Mainly to provide a coherent numerical framework which calculates consistently observables for both low- and high-energy experiments. Summary of revisions: Improved treatment of Higgs-boson masses and propagators. Improved treatment of Higgs-boson couplings and decays. Higgs-mediated two-loop electric dipole moments. B-meson observables. Running time: Less than 0.1 seconds. © 2008 Elsevier B.V.