Fredagskollokvium: Does the LHC show evidence for dark matter?
Are Raklev, UiO
As perhaps the most popular candidate for WIMP dark matter, the lightest neutralino of the
Minimal Supersymmetric Standard Model (MSSM) has been searched for extensively at the LHC. In this talk we will investigate what constraints the LHC has set on the neutralino using its most general parameterisation in the MSSM. Under the background-only hypothesis we show that current LHC searches do not robustly exclude any range of neutralino masses. However, allowing for possible excesses, a pattern in several LHC analyses provides evidence for the existence of a lightest neutralino in the mass range 8--155 GeV at the 95% confidence level. We find that this evidence has a combined local significance of 3.5σ, subject to a number of cautions.