We present simplified models for the galactic center γ-ray excess where Dirac dark matter annihilates into pairs or triplets of on-shell bosonic mediators to the Standard Model. These annihilation modes allow the dark matter mass to be heavier than those of conventional effective theories for the γ-ray excess. Because the annihilation rate is set by the dark mattermediator coupling, the Standard Model coupling can be made parametrically small to 'hide' the dark sector by suppressing direct detection and collider signals. We explore the viability of these models as a thermal relic and on the role of the mediators for controlling the γ-ray spectral shape. We comment on ultraviolet completions for these simplified models and novel options for Standard Model final states.

We examine the current constraints and future sensitivity of coherent elastic neutrino-nucleus scattering (CEνNS) experiments to mixing scenarios involving a Z 0 which interacts via portals with the standard model. We contrast the results against those from fixed target, atomic parity violation, and solar neutrino experiments. We demonstrate a significant dependence of the experimental reach on the Z 0 coupling nonuniversality and the complementarity of CEνNS to existing searches.

We show that the messenger-matter couplings of Flavored Gauge Mediation Models can generate substantial stop mixing and new contributions to the stop masses, leading to Higgs masses around 126 GeV with sub-TeV superpartners, and with some colored superpartners around 1-2 TeV in parts of the parameter space. We study the spectra of a few examples with a single messenger pair coupling dominantly to the top, for different messenger scales. Flavor constraints in these models are obeyed by virtue of supersymmetric alignment: the same flavor symmetry that explains fermion masses dictates the structure of the matter-messenger couplings, and this structure is inherited by the soft terms. We present the leading 1-loop and 2-loop contributions to the soft terms for general coupling matrices in generation space. Because of the Higgs-messenger mixing induced by the new couplings, the calculation of these soft terms via analytic continuation requires careful matching of the high-and low-energy theories. We discuss the calculation in detail in the Appendix.

We study the sensitivity of detectors with directional sensitivity to coherent elastic neutrino-nucleus scattering (CEνNS), and how these detectors complement measurements of the nuclear recoil energy. We consider stopped pion and reactor neutrino sources, and use gaseous helium and fluorine as examples of detector material. We generate Standard Model predictions, and compare to scenarios that include new, light vector or scalar mediators. We show that directional detectors can provide valuable additional information in discerning new physics, and we identify prominent spectral features in both the angular and the recoil energy spectrum for light mediators, even for nuclear recoil energy thresholds as high as ∼ 50 keV. Combined with energy and timing information, directional information can play an important role in extracting new physics from CEνNS experiments.