Recently, the atmospheric neutrino experiment SuperKamiokande has announced evidence for non-zero neutrino mass, which indicates the existence of physics beyond the Standard Model (SM). Generally in models that accommodate neutrino oscillations, lepton-flavour-violating phenomena (LFV) can occur not only in the neutrino, but also in the charged-lepton sector. In this paper, we will discuss LFV ...

Without assuming that Higgs masses have the same values as other scalar masses at the input GUT scale, we combine constraints on the minimal supersymmetric extension of the Standard Model (MSSM) coming from the cold dark matter density with the limits from direct searches at accelerators such as LEP, indirect measurements such as b → sγ decay and the anomalous magnetic moment of the muon. The r...

Neutrinoless double beta decay (0νββ) induced by superparticle exchange is investigated. Such a supersymmetric (SUSY) mechanism of 0νββ decay arises within SUSY theories with R-parity non-conservation (R p /). We consider the minimal supersymmetric standard model (MSSM) with explicit R p / terms in the superpotential (R p / MSSM). The decay rate for the SUSY mechanism of 0νββ decay is calculate...

We review the physics potential of the GigaZ option of the International Linear Collider (ILC) for probing the Minimal Supersymmetric Standard Model (MSSM) via the sensitivity of the electroweak precision observables measured at the ILC to quantum corrections [1]. A particular focus is put on the effective leptonic weak mixing angle, sin θeff . The MSSM predictions take into account the complet...

SOFTSUSY is a program which accurately calculates the spectrum of super-particles in the Minimal Supersymmetric Standard Model (MSSM). The program solves the renormalisation group equations with theoretical constraints on soft supersymmetry breaking terms provided by the user. Weak-scale gauge coupling and fermion mass data (including one-loop finite MSSM corrections) are used as a boundary con...

SOFTSUSY is a program which accurately calculates the spectrum of su-perparticles in the Minimal Supersymmetric Standard Model (MSSM). The program solves the renormalisation group equations with theoretical constraints on soft su-persymmetry breaking terms provided by the user. Weak-scale gauge coupling and fermion mass data (including one-loop finite MSSM corrections) are used as a boundary co...

The complete O(α) corrections including soft-photon bremsstrahlung to the process e+e− → W+W− in the MSSM are calculated for on-shell W bosons. The relative difference between the MSSM and Standard Model corrections is generally quite small. The maximum deviation from the Standard Model within the scanned region of parameter space is . 1.5% for unpolarized and transversally polarized W bosons, ...

F = O(TeV )] the conventional MSSM Higgs sector can be substantially modified, mainly because the Higgs potential contains additional effective quartic terms. The Higgs spectrum can be dramatically changed, and the lightest state can be much heavier than in usual SUSY scenarios. Novel opportunities for electroweak breaking arise, and the electroweak scale may be obtained in a less fine-tuned wa...

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 → H+H− are calculated with the complete set of MSSM particles. Numerical results are presented for the cross section of the inclusive hadron process pp → gg → H+H−+X...

If the soft Supersymmetry (SUSY) breaking masses and couplings are complex,then the associated CP-violating phases can in principle modify the known phe-nomenological pattern of the Minimal Supersymmetric Standard Model (MSSM).We investigate here their effects on Higgs boson production in the gluon-gluon fusionmode at the Tevatron and the Large Hadron Collider (LHC), by taki...