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Quark masses and weak couplings in the Standard Model and beyond
Riccardo Barbieri
I discuss two topics: i) the empirical adequacy of the Standard Model in the Flavour Sector in view of recent data; ii) the possible existence of a hidden structure in the quark ma…
A Constrained Standard Model: Effects of Fayet-Iliopoulos Terms
Riccardo Barbieri, Lawrence J. Hall, Yasunori Nomura
In hep-ph/0011311 the one Higgs doublet standard model was obtained by an orbifold projection of a 5D supersymmetric theory in an essentially unique way, resulting in a prediction…
Models of Scherk-Schwarz Symmetry Breaking in 5D: Classification and Calculability
Riccardo Barbieri, Lawrence J. Hall, Yasunori Nomura
The form of the most general orbifold breaking of gauge, global and supersymmetries with a single extra dimension is given. In certain theories the Higgs boson mass is ultraviolet…
b -> s gamma in a calculable model of Electroweak Symmetry Breaking
Riccardo Barbieri, Giacomo Cacciapaglia, Alessandro Romito
In a recently proposed extension of the Standard Model with a compact extra dimension of size R we compute the leading corrections, of relative order (m_t R)^2, to the Branching Ra…
Softly Broken Supersymmetric Desert from Orbifold Compactification
Riccardo Barbieri, Lawrence J. Hall, Yasunori Nomura
A new viewpoint for the gauge hierarchy problem is proposed: compactification at a large scale, 1/R, leads to a low energy effective theory with supersymmetry softly broken at a mu…