Kimiko Yamashita

Simplified dark matter models with a spin-2 mediator at the LHC

We consider simplified dark matter models where a dark matter candidate couples to the standard model (SM) particles via an s-channel spin-2 mediator, and study constraints on the model parameter space from the current LHC data. Our focus lies on the complementarity among different searches, in particular monojet and multijet plus missing-energy searches and resonance searches. For universal couplings of the mediator to SM particles, missing-energy searches can give stronger constraints than WW, ZZ, dijet, dihiggs,

Generalized Heisenberg–Euler formula in Abelian gauge theory with parity violation

t\bar{t}

Construction of a model of monopolium and its search via multiphoton channels at LHC

tt¯,

Vacuum magnetic birefringence experiment as a probe of the dark sector

b\bar{b}

Ratchet baryogenesis and an analogy with the forced pendulum

bb¯ resonance searches in the low-mass region and/or when the coupling of the mediator to dark matter is much larger than its couplings to SM particles. The strongest constraints, however, come from diphoton and dilepton resonance searches. Only if these modes are suppressed, missing-energy searches can be competitive in constraining dark matter models with a spin-2 mediator.

Human Identification Using Local Roughness Patterns in Heartbeat Signal

We investigate contributions of Kaluza-Klein (KK) graviton in extra dimension models to the process