Supersymmetric contribution to the CP asymmetry of B-> J/\psi \phi in the light of recent B_s -\bar{B}_s measurements

We derive new model independent constraints on the supersymmetric extensions of the standard model from the new experimental measurements of B_s -\bar{B}_s mass difference. We point out that supersymmetry can still give a significant contribution to the CP asymmetry of B_s ->J/\psi \phi that can be measured at the LHCb experiment. These new constraints on the LL and RR squark mixing severely restricted their possible contributions to the CP asymmetries of B-> \phi K and B - >\eta' K. Therefore, SUSY models with dominant LR flavor mixing is the only way to accommodate the apparent deviation of CP asymmetries from those expected in the standard model. Finally we present an example of SUSY non-minimal flavor model that can accommodate the new \Delta M_{B_s} results and also induces significant CP asymmetries in B_s ->J/\psi \phi, B->\phi K and B ->\eta' K processes.Comment: 4 page

TeV Scale Gauged B-L With Inverse Seesaw Mechanism

We propose a modified version of the TeV scale B-L extension of the standard model, where neutrino masses are generated through the inverse seesaw mechanism. We show that heavy neutrinos associated with this model can be accessible via clean signals at the LHC. The search for the extra gauge boson Z'_{B-L} through the decay into dileptons or two dileptons plus missing energy is studied. We also show that the B-L extra Higgs can be directly probed at the LHC via a clean dilepton and missing energy signal.Comment: 4 pages, revte

Cosmological implications of supersymmetric CP violating phases

We show that large SUSY phases have no significant effect on the relic density of the lightest supersymmetric particle (LSP). However, they are very significant for the detection rates. We emphasise that the phase of the trilinear coupling increase the direct and indirect detection rates.Comment: 4 pages, 1 figure, talk given at Cosmo99, 27 Sept. - 2 Oct. 1999, Trieste, Italy (to appear in the proceedings

Right-handed Sneutrino Inflation in SUSY B-L with Inverse Seesaw

We propose a scenario for realizing inflation in the framework of supersymmetric B-L extension of the Standard Model. We find that one of the associated right-handed sneutrinos (the superpartner of the Standard Model singlet fermion) can provide a new non-trivial inflationary trajectory at tree level (therefore breaking B-L during inflation). As soon as the inflation ends, the right-handed sneutrino falls into the supersymmetric vacuum, with a vanishing vacuum expectation value, so that B-L symmetry is restored. In this class of models, the B-L gauge symmetry will be radiatively broken at a TeV scale and light neutrino masses are generated through the inverse seesaw mechanism.Comment: 5 pages, 2 figures; version to be published in Phys. Rev.

Cosmological Consequences of QCD Phase Transition(s) in Early Universe

We discuss the cosmological consequences of QCD phase transition(s) on the early universe. We argue that our recent knowledge about the transport properties of quark-gluon plasma (QGP) should throw additional lights on the actual time evolution of our universe. Understanding the nature of QCD phase transition(s), which can be studied in lattice gauge theory and verified in heavy ion experiments, provides an explanation for cosmological phenomenon stem from early universe.Comment: 8 pages, 2 eps figure