Title: The importance of heavy quark loops for dark matter searches
Abstract:
The latest results from LHC searches for jets in association with missing transverse energy place strong bounds on the interactions of dark matter with Standard Model particles. In my talk, I will discuss how to convert these results into constraints on the dark matter direct detection cross section using effective operators. Because of the large separation of scales, however, a naive translation of limits often gives incorrect answers. I will therefore discuss the importance of loop-corrections both for spin-independent interactions and spin-dependent interactions as well as for processes relevant for dark matter indirect detection.
Time:
2:00pm - 3:00pm
Description:
Special Seminar: Cédric Weiland
Title:
Impact of fermionic singlets on lepton universality tests
Abstract:
A fundamental consequence of the gauge structure of the Standard Model (SM) is the universality of the coupling constants. The high experimental precision achieved by lepton universality tests offers a unique opportunity to probe deviations from the SM.
We consider a tree-level enhancement to the violation of lepton flavour universality in meson decays arising from modified Wlν couplings in the Standard Model minimally extended by fermionic singlets (present in many SM extensions).
Due to the presence of additional mixings between the active neutrinos and the new sterile states, the deviation from unitarity of the leptonic mixing matrix might lead to a tree-level enhancement of, for instance, RP = Γ(P → eν)/Γ(P → μν), with P = K, π.
We illustrate these enhancements in the case of the inverse seesaw model, showing that one can saturate the current experimental bounds on ∆rK (and ∆rπ), while complying with different experimental and observational constraints.
Time:
4:00pm - 5:00pm
Location:
FRH 4135
Description:
Speaker: Takeo Moroi
Title: Phenomenology of Supersymmetric Model with Heavy Superparticles
Abstract:
I consider supersymmetric model in which the masses of superparticles (in particular, those of scalar fermions) are about 10-100TeV. Such a model is motivated by the recent discovery of the Higgs boson with the mass of about 126GeV and by the negative discovery of superparticles at the LHC. I discuss cosmology and show that the Wino-like neutralino becomes a viable candidate of dark matter. I also consider
CP and flavor violations in such a model, and show that, even if the superparticles are so heavy, we may have a chance to observe CP and flavor violation signals.
3pm» Joint Particle Seminar: Felix Kahlhoefer
