Phenomenology 2014 Symposium

Looking for a Light Nonthermal Dark Matter at the LHC

6 May 2014, 15:15

15m

Benedum Hall G31 (University of Pittsburgh)

Dark Matter III

Speaker

Yu Gao (University of Texas A & M)

Description

This talk discusses the collider phenomenolgy of a nonthermal dark matter model with a 1-GeV dark matter candidate. Together with additional colored states, the dark matter also explains baryongensis. Since the light dark matter is not parity-protected, it can be singly produced at the LHC. This leads to large missing energy associated with an energetic jet whose transverse momentum distribution is featured by a Jacobian-like shape. Currently available LHC data can offer significant bounds on this model. I will also comment on the model's indication to the recently observed 3.5 keV photon emission from galaxy clusters.

Summary

The light nonthermal dark matter model relates the baryon asymmetry to dark matter production without imposing a discrete symmetry. The dark matter candidate is degenerate in mass with the proton.

LHC $n$ jets + MET searches, especially with the monojet channel, give significant constraint on the model parameters. For a heavy scalar mediator mass around 1 TeV and below, the lesser between $\lambda_1$ and $\lambda_2$ is constrained to ${\cal O}(0.1)$.
Signals in heavy quark flavors, esp. the mono-top with MET, can also be an interesting final state.

The light nonthermal dark matter model can also explain the emission of 3.5 keV photon with model parameters that are consistent with current LHC constraints.

The talk is partially based on e-print 1401.1825 and 1403.5717.

Presentation materials

Slides

baryogen_pheno14_yu_gao.pdf