We study lepton flavour violating decays of neutralinos and sleptons within the Minimal Supersymmetric Standard Model, taking into account the recent bounds on flavour violating lepton decays. Taking the SPS1a’ scenario as an example, we show that some of these lepton flavour violating branching ratios of neutralinos and sleptons can be ∼5-10%. We study the impact of the lepton flavour violatin...

We consider the supersymmetric seesaw mechanism induced by the exchange of heavy SU(2)W triplet states, rather than ‘right-handed’ neutrino singlets, to generate neutrino masses. We show that in this scenario the neutrino flavour structure tested at low-energy in the atmospheric and solar neutrino experiments is directly inherited from the neutrino Yukawa couplings to the triplets. This allows ...

Flavour physics represents one of the most interesting and, at the same time, less understood sector of the Standard Theory. On the one hand, the peculiar pattern of quark and lepton masses, and their mixing angles, may be the clue to some new dynamics occurring at high-energy scales. On the other hand, the strong suppression of flavour-changing neutral-current processes, predicted by the Stand...

We investigate three–flavour chiral perturbation theory including virtual photons in a limit where the strange quark mass is much larger than the external momenta and the up and down quark masses, and where the external fields are those of two–flavour chiral perturbation theory. In particular we work out the strange quark mass dependence of the electromagnetic two–flavour low–energy constants C...

We discuss the possibility of introducing an SU(2) global flavour symmetry in the context of flat extra dimensions. In particular we concentrate on the 5-dimensional case and we study how to obtain the flavour structure of the Standard Model quark sector compactifying the fifth dimension on the orbifold S1/Z2 à la Scherk-Schwarz (SS). We show that in this case it is possible to justify the five...

We discuss the possibility of introducing an SU(2) global flavour symmetry in the context of flat extra dimensions. In particular we concentrate on the 5-dimensional case and we study how to obtain the flavour structure of the Standard Model quark sector compactifying the fifth dimension on the orbifold S1/Z2 à la Scherk-Schwarz (SS). We show that in this case it is possible to justify the five...

We study the flavour singlet mesons from first principles using lattice QCD. We explore the splitting between flavour singlet and non-singlet for vector and axial mesons as well as the more commonly studied cases of the scalar and pseudoscalar mesons.