Supersymmetric models with radiatively-driven naturalness enjoy modest electroweak fine-tuning at the 10% level while respecting LHC sparticle and Higgs mass constraints. These models have an inverted electroweakino spectrum with $\mu < M_{1} < M_{2} < M_{3}$ leading to a rather clean same-sign diboson signature from wino pair production at hadron colliders. We examine aspects of signal and...

Combining anomaly with $Z^{\prime}$ mediation of SUSY breaking allows us to solve the tachyonic problem of the former and avoid fine tuning in the latter. This scenario includes an extra $U(1)^{\prime}$ gauge symmetry and extra singlet scalar $S$ which provides a solution to the `$\mu$ problem' of the MSSM. The low-energy particle spectrum is calculated from the UV inputs using the...

We study the phenomenology of a supersymmetric extension of the Standard Model with an $R$-symmetry under which $R$-charges correspond to the baryon number. This identification allows for the presence in the superpotential of the $R$-parity violating term $\lambda''U^c D^c D^c$ without breaking baryon number, which loosens several bounds on this operator while changing considerably the...

Flavor symmetries à la Froggatt-Nielsen (FN) provide a compelling way to explain the hierarchies of fermionic masses and mixing angles in the Yukawa sector. In Supersymmetric~(SUSY) extensions of the Standard Model where the mediation of SUSY breaking occurs at scales larger than the breaking of flavor, this symmetry must be respected not only by the Yukawas of the superpotential, but by the...

Matching a full theory onto an effective field theory by integrating out heavy fields is often useful for connecting low-energy phenomenology to high-scale physics. I introduce a new formulation of one-loop matching in terms of covariant diagrams, which, unlike conventional Feynman diagrams, preserve gauge covariance in intermediate steps and thus simplify calculations. I will show examples of...

We present a dynamical cosmological solution that simultaneously

accounts for the early inflationary stage of the Universe and solves the

supersymmetric little hierarchy problem via the relaxion mechanism. First,

we consider an inflationary potential arising from the $D$-term of a new $U(1)$ gauge symmetry with a Fayet--Iliopolous term, that is independent of the relaxion. A technically...

Supersymetric models are subject both to direct constraints from collider searches and to indirect limits from electroweak observables such as the Higgs mass and flavor-changing processes. A minimal scenario consistent with current experimental data suggests a supersymmetric spectrum with a split sfermion sector. Such a spectrum can naturally be realized when supersymmetry is broken in a...

The prospect of heavy super-partners in the MSSM is often met with criticism on the grounds of naturalness arguments. We present a recently proposed methodology for studying the little hierarchy problem that can lead to contrasting conclusions. This approach focuses on hierarchies between the EW and SUSY scales that can be achieved without specifying model parameters beyond one significant...