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  • 2000-2004  (9)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Neutral MSSM Higgs-boson production at $\mathrm{e^+e^-}$ colliders in the Feynman-diagrammatic approach (2001)
    Springer
    The European physical journal 19 (2001), S. 535-546 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We calculate the cross sections for the neutral Higgs-boson production at $e^+e^-$ colliders in the Minimal Supersymmetric Standard Model (MSSM) using the Feynman-diagrammatic approach and the on-shell renormalization scheme. We incorporate the Higgs-boson propagator corrections, evaluated up to two-loop order, into the prediction of the cross sections for the Higgs-boson production mechanism $e^+e^- \to hZ,hA$ . The propagator corrections consist of the full one-loop contribution, including the effects of non-vanishing external momentum, and at the two-loop level of the dominant corrections of ${\cal O}(\alpha\alpha_s)$ and further sub-dominant contributions. The results are supplemented with the complete set of one-loop vertex and box corrections. The effects of the two-loop propagator corrections are investigated in detail. We briefly discuss also the effect of the box contributions for high $\sqrt{s}$ . We compare our results with the case where only the corrections to the effective mixing angle, evaluated within the renormalization-group-improved one-loop Effective Potential approach, are taken into account. We find agreement better than 10% for LEP2 energies and deviations larger than 20% for $\sqrt{s} = 500$ GeV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100520100631
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electroweak precision observables in the MSSM with non-minimal flavor violation (2004)
    Springer
    The European physical journal 37 (2004), S. 481-493 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The leading corrections to electroweak precision observables in the MSSM with non-minimal flavor violation (NMFV) are calculated and the effects on M W and $\sin^2\theta_{\text{eff}}$ are analyzed. The corrections are obtained by evaluating the full one-loop contributions from the third and second generation scalar quarks, including the mixing in the scalar top and charm, as well as in the scalar bottom and strange sector. Furthermore the leading corrections to the mass of the lightest MSSM Higgs-boson, m h , is obtained. The electroweak one-loop contribution to M W can amount up to 140 MeV and up to 70 x 10-5 for $\sin^2_{\text{eff}}$ , allowing one to set limits on the NMFV parameters. The corrections for m h are not significant for moderate generation mixing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjc/s2004-02006-1
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Decay widths of the neutral $\mathcal{CP}$ -even MSSM Higgs bosons in the Feynman-diagrammatic approach (2000)
    Springer
    The European physical journal 16 (2000), S. 139-153 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. In the Minimal Supersymmetric Standard Model (MSSM) we incorporate the Higgs-boson propagator corrections, evaluated up to two-loop order, into the prediction of $\Gamma(h \to f\bar f)$ and $BR(h \to f \bar f)$ for $f = b, c, \tau$ . The propagator corrections consist of the full one-loop contribution, including the effects of non-vanishing external momentum, and corrections of $\mathcal{O}(\alpha\alpha_s)$ at the two-loop level. The results are supplemented with the dominant one-loop QED corrections and final state QCD corrections from both gluons and gluinos. The effects of the two-loop propagator corrections and of the one-loop gluino contributions are investigated in detail. Our results are compared with the result obtained within the renormalization group approach. Agreement within 10% is found for most parts of the MSSM parameter space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100520050010
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Regularization and supersymmetry-restoring counterterms in supersymmetric QCD (2001)
    Springer
    The European physical journal 20 (2001), S. 105-119 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We calculate symmetry-restoring counterterms in supersymmetric QCD at the one-loop level. First we determine loop corrections to the supersymmetry and gauge transformations and find counterterms in such a way that the symmetry algebra holds at the one-loop level. Then these results are used to derive the symmetry-restoring counterterms to all trilinear interactions. In order to obtain unique results it is crucial to use the Slavnov-Taylor identity, which does not only contain supersymmetric and gauge Ward identities but also describes the symmetry algebra. In dimensional regularization this procedure yields unique non-zero values for the counterterms. In contrast, in dimensional reduction we find that no non-symmetric counterterms are needed, neither for the symmetry transformations nor for the physical interactions. For the considered cases this result constitutes a definite test of the supersymmetry and gauge invariance of the scheme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100520100651
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Towards high-precision predictions for the MSSM Higgs sector (2003)
    Springer
    The European physical journal 28 (2003), S. 133-143 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The status of the evaluation of the MSSM Higgs sector is reviewed. The phenomenological impact of recently obtained corrections is discussed. In particular it is shown that the upper bound on mh within the MSSM is shifted upwards. Consequently, lower limits on $\tan\beta$ obtained by confronting the upper bound as function of $\tan\beta$ with the lower bound on mh from Higgs searches are significantly weakened. Furthermore, th e region in the MA- $\tan\beta$ -plane where the coupling of the lightest Higgs boson to down-type fermions is suppressed is modified. The presently not calculated higher-order corrections to the Higgs-boson mass matrix are estimated to shift the mass of the lightest Higgs boson by up to 3 GeV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjc/s2003-01152-2
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Pair production of charged MSSM Higgs bosons by gluon fusion (2000)
    Springer
    The European physical journal 13 (2000), S. 175-184 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The production of pairs of charged Higgs bosons as predicted by the minimal supersymmetric standard model (MSSM) via the gluon fusion mechanism is investigated. The amplitudes at the leading one-loop order for the parton process $gg \to H^+H^-$ are calculated with the complete set of MSSM particles. Numerical results are presented for the cross section of the inclusive hadron process $p p \to gg \to H^+ H^- + X$ at the LHC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100520000249
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Renormalization of supersymmetric Yang-Mills theories with soft supersymmetry breaking (2002)
    Springer
    The European physical journal 23 (2002), S. 735-747 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The renormalization of supersymmetric Yang-Mills theories with soft supersymmetry breaking is presented using spurion fields for introducing the breaking terms. It is proven that renormalization of the fields and parameters in the classical action yields precisely the correct counterterms to cancel all divergences. In the course of the construction of higher orders additional independent parameters appear, but they can be shown to be irrelevant in physics respects. Thus, the only parameters with influence on physical amplitudes are the supersymmetric and the well-known soft breaking parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100520200923
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Yukawa coupling quantum corrections to the self-couplings of the lightest MSSM Higgs boson (2002)
    Springer
    The European physical journal 23 (2002), S. 163-172 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. A detailed analysis of the top-quark/squark quantum corrections to the lightest CP-even Higgs boson $(h^0)$ self-couplings is presented in the MSSM. By considering the leading one-loop Yukawa-coupling contributions of ${\cal O} (m_t^4)$ , we discuss the decoupling behavior of these corrections when the top squarks are heavy compared to the electroweak scale. As shown analytically and numerically, the large corrections can almost completely be absorbed into the $h^0$ -boson mass. Our conclusion is that the $h^0$ self-couplings remain similar to the coupling of the SM Higgs boson for the heavy top-squark sector.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100520100862
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    The sfermion-mass spectrum of the MSSM at the one-loop level (2003)
    Springer
    The European physical journal 32 (2003), S. 127-133 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The sfermion-mass spectrum of the minimal supersymmetric standard model is investigated at the one-loop level. An on-shell scheme has been specified for renormalization of the basic breaking parameters of the sfermionic sector. Owing to SU(2)-invariance, the soft-breaking mass parameters of the left-chiral scalar fermions of each isospin doublet are identical. Thus, one of the sfermion masses of each doublet can be expressed in terms of the other masses and receives a mass shift at the one-loop level with respect to the lowest-order value, which can be of O(10 GeV). Both strong and electroweak contributions have been calculated for scalar quarks and leptons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjc/s2003-01387-9
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