Abstract
Several searches for dark matter have been performed by the CMS and ATLAS collaborations, using proton-proton collisions with a center-of-mass energy of 13 TeV produced by the Large Hadron Collider. Different signatures may highlight the presence of dark matter: the imbalance in the transverse momentum in an event due to the presence of undetectable dark matter particles, produced together with one Standard Model particle, a bump in the di-jet or di-lepton invariant mass distributions, or an excess of events in the di-jet angular distribution, produced by a dark matter mediator. No significant discrepancies with respect to the Standard Model predictions have been found in data, so that limits on the dark matter couplings to ordinary matter, or limits on the dark matter particles and mediators masses have been set. The results are also re-interpreted as limits on the dark matter interaction cross-section with baryonic matter, so that a comparison with direct detection experiments is allowed.
Highlights
The existence of dark matter (DM) is well established in modern physics, due to several astronomical observations [1,2]
To search for broad resonances, which would be impossible to distinguish from the SM quantum chromodynamics (QCD) m jj falling spectrum, analyses based on di-jet angular distribution have been designed: SM jet pairs are usually produced in the forward region of the detector, while heavy mediators would preferentially emit jets in the barrel
The main searches for dark matter performed by the CMS and ATLAS collaborations have been presented
Summary
The existence of dark matter (DM) is well established in modern physics, due to several astronomical observations [1,2]. Precise measurements from the Planck experiment [3] estimate that DM composes 25% of the total Universe mass-energy budget; its nature is still unknown. Several searches for DM have been put in place in the last few decades, assuming it is made of particles that interact weakly with the known matter (weakly-interacting massive particles (WIMPs)). The main searches performed using the CMS [4] and ATLAS [5] detectors, exploiting data collected during the first part of Run 2 of the Large Hadron Collider (LHC) data taking are presented. The integrated luminosity collected by each experiment during this data-taking period is about 36 fb−1
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