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For any new physics possibly emerging in the future B experiments, the problem is how to extract the signals from the SM background. We consider the decay b → ssd̄ which is very small in the SM. In the MSSM this decay is possibly accessible in the future experiments. In the supersymmetric models with R-parity violating couplings, this channel is not(More)
In the Standard Model, the box-diagram mediated decay b → ssd̄ is predicted to occur with an extremely small branching ratio of below 10, thus providing a safe testing ground for exposing new physics. We study this process in several Two Higgs Doublet Models and explore their parameter space, indicating where this process becomes observable. Alexander von(More)
In grand unified theories (GUT), non-universal boundary conditions for the gaugino masses may arise at the unification scale, and affect the observability of the neutral MSSM Higgs bosons (h/H/A) at the LHC. The implications of such non-universal gaugino masses are investigated for the Higgs boson production in the SUSY cascade decay chain g̃ → q̃q, q̃ →(More)
We consider the minimal coupling of two photons to neutral scalar and pseudoscalar fields, as for instance in the case of the Higgs boson and axion, respectively. In this framework, we analyze the photon dispersion relations in the presence of static and homogeneous external magnetic and electric fields, by taking into account the contribution of the(More)
We study a generalization of anomaly-mediated supersymmetry breaking (AMSB) scenarios, under the assumption that the effects of the high-scale theory do not completely decouple and D-term type contributions can be therefore present. We investigate the effect of such possible D-term additional contributions to soft scalar masses by requiring that, for(More)
Supersymmetric gauge field theories are among the most promising models for physics beyond the standard model. The low-energy supersymmetry (SUSY) solves the so-called hierarchy problem, which basically follows from the tremendous scale differences in realistic models including gravity. After SUSY breaking, SUSY models, e.g. the minimal supersymmetric(More)
I review progress on investigations concerning top quark physics and QCD at a future linear e+e collider that has been achieved since the presentation of the TESLA technical design report [1] in spring 2001. I concentrate on studies that have been presented during the workshop series of the Extended Joint ECFA/DESY Study on Physics and Detectors for a(More)
We study non-universal corrections to the gauge couplings due to higher dimensional operators in supersymmetric SU(5) grand unified theories. The corrections are, in general, parametrized by three components originating from 24, 75 and 200 representations. We consider the prediction of α3(MZ) along each 24, 75 and 200 direction, and their linear(More)