23-28 June 2014
Amsterdam
Europe/Zurich timezone

Co-annihilating dark matter and effective operator analysis

27 Jun 2014, 17:45
15m
Room 6 (Tuschinski Theatre)

Room 6

Tuschinski Theatre

Presentation Particle Physics Particle Physics

Speaker

Yi Cai

Description

We study dark matter (DM) models in which there are two dark sector particles, $\chi_1$ and $\chi_2$, of near mass. In such models, co-annihilation of $\chi_1$ and $\chi_2$ may be the dominant process controlling the DM relic density during freezeout in the early universe. In this scenario, there is no significant contribution to direct and indirect detection signals, unless there exists an extreme degeneracy in the masses of the lightest dark sector particles. Therefore, relic density constraints and collider searches provide the most relevant information about these models. We consider Dirac fermion dark matter which couples to standard model (SM) particles via an effective operator. For the collider phenomenology, where an effective field theory may not be valid, we adopt a simple Z' model to provide an appropriate UV completion. We explore the interesting LHC signals that arise from the dark matter production process $pp \rightarrow \overline{\chi_1} + \chi_2 + \textrm{ jet}$, followed by the decay $\chi_2 \rightarrow \chi_1 + SM$.

Primary authors

Anibal Medina (The University of Melbourne) Nicole Bell (University of Melbourne) Yi Cai

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