We discuss the profile of neutrino masses and mixings in models with large extra dimensions when right handed neutrinos are present in the branes along with the usual standard model particles. In these models, string scale must be bigger than 10 8 GeV to have desired properties for the neutrinos at low energies. The lightest neutrino mass is zero and there is oscillations to sterile neutrinos that are different from other models with the bulk neutrino.
We study an extension of the MSSM with a fourth generation of chiral matter. With this extension no value of tan β allows the theory to stay perturbative up to the GUT scale. We suggest one model with extra vector-like states at the TeV scale that allows perturbativity all the way up to the GUT scale.VEVs of the up type to the down type Higgses) λ b and λ τ can also be large (∼ 1 for tan β ≈ 60). How would the picture change if there were a fourth family?Current lower limits on the masses of the 4th generation fermions at 95% C.L. are [1]:
We consider the pair production of color triplet spin-3 2 quarks and their subsequent decays at the LHC. This particle, if produced, will most likely decay into top quark and gluon, bottom quark and gluon, or a light quark jet and gluon, depending on the quantum number of the spin-
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