Learn More
We make the simple observation that there exists a universal unitarity triangle for all models, like the SM, the Two Higgs Doublet Models I and II and the MSSM with minimal flavour violation, that do not have any new operators beyond those present in the SM and in which all flavour changing transitions are governed by the CKM matrix with no new phases(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 gener-alisations: the minimal supersymmetric standard model with violation of CP,(More)
The charm-loop contribution to ¯ B → X s γ is found to be numerically dominant and very stable under logarithmic QCD corrections. The strong enhancement of the branching ratio by QCD logarithms is mainly due to the b-quark mass evolution in the top-quark sector. These observations allow us to achieve better control over residual scale-dependence at the(More)
We discuss possible large contributions to B → X s γ, which can occur at the next-to-leading order in supersymmetric models. They can originate from terms enhanced by tan β factors, when the ratio between the two Higgs vacuum expectation values is large, or by logarithm of M susy /M W , when the supersymmetric particles are considerably heavier than the W(More)
We compute the QCD next-to-leading order matching conditions of the (chromo)-magnetic operators relevant for B → X s γ in supersymmetric models with minimal flavour violation. The calculation is performed under the assumption that the charginos and one stop are lighter than all other squarks and the gluino. In the parameter region where a light charged(More)
We discuss whether the NuTeV anomaly can be explained, compatibly with all other data, by QCD effects (maybe, if the strange sea is asymmetric, or there is a tiny violation of isospin), new physics in propagators or couplings of the vector bosons (not really), loops of supersymmetric particles (no), dimension six operators (yes, for one specific SU(2)(More)