Search

We explain the 2.3σ deviation in the recent measurements of the neutral B meson decays into muon pairs from the standard model prediction in the framework of supersymmetric grand unified models using antisymmetric coupling as a new source of flavor violation. We show a correlation between the Bd → μ+μ-decay and the CP phase in the Bd → J/ψK decay and that their deviations from the standard model predictions can be explained after satisfying constraints arising from various hadronic and leptonic rare decay processes, B-B, K-K oscillation data, and electric dipole moments of electron and neutron. The allowed parameter space is typically represented by pseudoscalar Higgs mass mA ≤ 1 TeV and tan βH ( ≡ vu/vd ) ≲ 20 for squark and gluino masses around 2 TeV. [ABSTRACT FROM AUTHOR]

Supersymmetric SO(10) grand unified models with renormalizable Yukawa couplings involving 10, 126, and 120 Higgs fields have been shown to give a very economical theory for understanding quark-lepton flavor in a unified framework. In previous papers, we showed how nucleon decay can be suppressed in these models without invoking cancellation, by choice of Yukawa flavor texture within a type II seesaw framework for neutrinos that explains all mixings and masses including the recently observed "large" θ13. In this followup paper, we extend our earlier work to the case of type I seesaw and show that the recently measured large θ13 can be accommodated in this case while suppressing proton decay. We then point out that the two cases (type I and II) lead to different testable predictions for B(μ→e+γ) and B(τ→μ(e)+γ) as well as different flavor final states in nucleon decay. In particular, we find that for the type I seesaw case, B(τ→μ+γ) can be observable while at the same time suppressing B(μ→e+γ), whereas in the type II seesaw case, B(τ→μ+γ) is always suppressed whereas B(μ→e+γ) is observable. [ABSTRACT FROM AUTHOR]

If the lightest dark matter neutralino has a sufficiently large Higgsino component, its spin-independent and spin-dependent cross sections on nucleons can be sizable enough to be detected soon in direct and indirect surveys. We outline in this paper some characteristic features expected of mixed bino-Higgsino dark matter. If the observed relic density is saturated by the bino-Higgsino dark matter, it fixes the amount of allowable bino-Higgsino mixing and provides predictions for other observables which can be tested at the Large Hadron Collider (LHC). We study the correlation between the cross sections and the branching ratio of Bs→μ+μ-. For a mixed bino-Higgsino dark matter, the mass differences of the neutralinos can be less than MZ. This will cause an excess of lepton pairs, above the standard model predictions, from the decays of the two heavier neutralinos. We discuss implications of the dilepton invariant mass distribution, and outline a way to extract the neutralino parameters for testing gaugino mass unification and deducing the relic density from an interplay of astrophysical detection and LHC measurements. [ABSTRACT FROM AUTHOR]