119501183
Muon anomalous magnetic moment, B --> X/s gamma and dark matter detection in the string models with dilaton domination
We consider the muon anomalous magnetic moment aµ in the string models with dilaton domination with two different string scales : the usual GUT scale and the intermediate scale. After imposing the direct search limits on the lightest neutral Higgs and SUSY particle masses and the lightest neutralino LSP, the a SUSY is predicted to be less than 65 (55) × 10 10 for Mstring = 2 × 10 16 GeV (3 × 10 11 GeV). If we further impose the B → Xs branching ratio, the predicted a SUSY becomes lower to 35 ×10 10 for intermediate string scale. The resulting LSP - proton scattering cross section is less than ∼ 10 7 pb, which is below the sensitivity of the current direct dark matter search experiments, but could be covered by future experiments.
119501183
Muon anomalous magnetic moment, B --> X/s gamma and dark matter detection in the string models with dilaton domination
We consider the muon anomalous magnetic moment aµ in the string models with dilaton domination with two different string scales : the usual GUT scale and the intermediate scale. After imposing the direct search limits on the lightest neutral Higgs and SUSY particle masses and the lightest neutralino LSP, the a SUSY is predicted to be less than 65 (55) × 10 10 for Mstring = 2 × 10 16 GeV (3 × 10 11 GeV). If we further impose the B → Xs branching ratio, the predicted a SUSY becomes lower to 35 ×10 10 for intermediate string scale. The resulting LSP - proton scattering cross section is less than ∼ 10 7 pb, which is below the sensitivity of the current direct dark matter search experiments, but could be covered by future experiments.
118567798
Long-range interaction effects on neutrino oscillation
Motivated by the recent anomaly in the muon neutrino and anti-muon neutrino disappearance experiments, we consider a long-range interaction with an extremely light gauge boson and extraordinarily weak coupling. A long-range interaction, consistent with current bounds, could have very pronounced effects on atmospheric neutrino disappearance that will be studied with the IceCube DeepCore array, currently in operation, and can have a significant effect on future high-precision long-baseline oscillation experiments. This invited talk was based on the paper with Hooman Davoudiasl and William Marciano [1].
118631955
Identifying Sneutrino Dark Matter: Interplay between the LHC and Direct Search
Under R parity, the lightest supersymmetric particle (LSP) is stable and may serve as a good dark matter candidate. The R parity can be naturally introduced with a gauge origin at the TeV scale. We go over why a TeV scale B-L gauge extension of the minimal supersymmetric standard model is one of the most natural, if not demanded, low energy supersymmetric models. In the presence of a TeV scale Abelian gauge symmetry, the (predominantly) right-handed sneutrino LSP can be a good dark matter candidate. Its identification at the LHC is challenging because it does not carry any standard model charge. We show how we can use the correlation between the LHC experiments (dilepton resonance signals) and the direct dark matter search experiments (such as CDMS and XENON) to identify the right-handed sneutrino LSP dark matter in the B-L extended minimal supersymmetric standard model.
9857534
Neutralino dark matter from heavy axino decay
We consider cosmological consequences of a heavy axino, decaying to the neutralino in R-parity conserving models. The importance and influence of the axino decay on the resultant abundance of neutralino dark matter depends on the lifetime and the energy density of axino. For a high reheating temperature after inflation, copiously produced axinos dominate the energy density of the universe, and its decay produces a large amount of entropy. As a bonus, we obtain that the upper bound on the reheating temperature after inflation via gravitino decay can be moderated, because the entropy production by the axino decay more or less dilutes the gravitinos.
118589345
Phenomenology of the U(1)'-extended minimal supersymmetric standard model
31015901
Muon anomaly and dark parity violation.
The muon anomalous magnetic moment exhibits a 3.6σ discrepancy between experiment and theory. One explanation requires the existence of a light vector boson, Z(d) (the dark Z), with mass 10-500 MeV that couples weakly to the electromagnetic current through kinetic mixing. Support for such a solution also comes from astrophysics conjectures regarding the utility of a U(1)(d) gauge symmetry in the dark matter sector. In that scenario, we show that mass mixing between the Z(d) and ordinary Z boson introduces a new source of "dark" parity violation, which is potentially observable in atomic and polarized electron scattering experiments. Restrictive bounds on the mixing (m(Z(d))/m(Z))δ are found from existing atomic parity violation results, δ2<2×10(-5). Combined with future planned and proposed polarized electron scattering experiments, a sensitivity of δ2∼10(-6) is expected to be reached, thereby complementing direct searches for the Z(d) boson.