Linda M. Carpenter

Implementing General Gauge Mediation

Recently there has been much progress in building models of gauge mediation, often with predictions different than those of minimal gauge mediation. Meade, Seiberg, and Shih have characterized the most general spectrum which can arise in gauge-mediated models. We discuss some of the challenges of building models of general gauge mediation, especially the problem of messenger parity and issues connected with R symmetry breaking and CP violation. We build a variety of viable, weakly coupled models which exhibit some or all of the possible low energy parameters.

Collider searches for dark matter in events with a Z boson and missing energy

Searches for dark matter at colliders typically involve signatures with energetic initial-state radiation without visible recoil particles. Searches for mono-jet or mono-photon signatures have yielded powerful constraints on dark matter interactions with Standard Model particles. We extend this to the mono-Z signature and reinterpret an ATLAS analysis of events with a Z boson and missing transverse momentum to derive constraints on dark matter interaction mass scale and nucleon cross sections in the context of effective field theories describing dark matter which interacts via heavy mediator particles with quarks or weak bosons.

Axions in Gauge Mediation

In supersymmetric theories, the presence of axions usually implies the existence of a noncompact, (pseudo)moduli space. In gauge-mediated models, the axion would seem a particularly promising dark matter candidate. The cosmology of the moduli then constrains the gravitino mass and the axion decay constant; the former cannot be much below 10 MeV; the latter cannot be much larger than 10{sup 13} GeV. Axinos, when identifiable, are typically heavy and do not play an important role in cosmology.

Confronting the Fermi Line with LHC data: an Effective Theory of Dark Matter Interaction with Photons

We describe an effective theory of interaction between pairs of dark matter particles and pairs of photons. Such an interaction could accomodate

Gauge mediation with D terms

\chi\bar{\chi}\rightarrow\gamma\gamma

Higgs boson decay to light jets at the LHC

processes which might be the cause of the observed feature in the FermiLAT spectrum, as well as

Indirect Detection Constraints on the Model Space of Dark Matter Effective Theories

\gamma^*/Z\rightarrow \gamma\chi\bar{\chi}

Mono-Higgs-boson: A new collider probe of dark matter

processes, which would predict excesses at the LHC in the

Surveying the Phenomenology of General Gauge Mediation

\gamma+\missET

The NMSSM, Anomaly Mediation and a Dirac Bino

final-state. We reinterpret an ATLAS