Characterizing dark matter at the LHC in Drell-Yan events

Understand

Spectral features in LHC dileptonic events may signal radiative corrections coming from new degrees of freedom, notably dark matter and mediators.

• Using simplified models, we show how these features can reveal the fundamental properties of the dark sector, such as self-conjugation, spin and mass of dark matter, and the quantum numbers of the mediator.
• Distributions of both the invariant mass $m_{\ell \ell}$ and the Collins-Soper scattering angle $cos\theta_{CS}$ are studied to pinpoint these properties.
• We derive constraints on the models from LHC measurements of $m_{\ell \ell}$ and $cos\theta_{CS}$, which are competitive with direct detection and jets + Missing Energy searches.