Ulrich Ellwanger

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We consider the cosmology of a “3-brane universe” in a five dimensional (bulk) space-time with a cosmological constant. We show that Einstein’s equations admit a first integral, analogous to the first Friedmann equation, which governs the evolution of the metric in the brane, whatever the time evolution of the metric along the fifth dimension. We thus(More)
NMSPEC is a Fortran code that computes the sparticle and Higgs masses, as well as Higgs decay widths and couplings in the NMSSM, with soft susy breaking terms specified atMGUT. Exceptions are the soft singlet massm 2 s and the singlet self coupling κ, that are both determined in terms of the other parameters through the minimization equations of the Higgs(More)
The Supersymmetry Les Houches Accord (SLHA) [1] 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,(More)
The Fortran code NMHDECAY computes the masses, couplings and decay widths of all Higgs bosons of the NMSSM in terms of its parameters at the electroweak (or Susy breaking) scale: the Yukawa couplings λ and κ, the soft trilinear terms Aλ and Aκ, and tanβ and μeff = λ 〈S〉. The computation of the spectrum includes leading two loop terms, electroweak(More)
We identify scenarios not ruled out by LEP data in which NMSSM Higgs detection at the LHC will be particularly challenging. We first review the ‘no-lose’ theorem for Higgs discovery at the LHC that applies if Higgs bosons do not decay to other Higgs bosons — namely, with L = 300 fb−1, there is always one or more ‘standard’ Higgs detection channel with at(More)
We describe the the improved properties of the NMHDECAY program, that is designed to compute Higgs and sparticle masses and Higgs decay widths in the NMSSM. In the version 2.0, Higgs decays into squarks and sleptons are included, accompagnied by a calculation of the squark, gluino and slepton spectrum and tests against constraints from LEP and the Tevatron.(More)
The radiative corrections to the 3×3 scalar and the 2×2 pseudoscalar neutral Higgs boson mass matrices are calculated in the supersymmetric extension of the standard model including a gauge singlet superfield in the effective potential approach. The full t and b quark/squark contributions including the nonlogarithmic terms are taken into account, which are(More)
In the (M+1)SSM an additional gauge singlet Weyl spinor appears in the neutralino sector. For a large part of the parameter space this approximative eigenstate is the true LSP. Then most sparticle decays proceed via an additional cascade involving the NLSP → LSP transition, where the NLSP is the non-singlet next-to-lightest neutralino. We present a(More)