Triggering and Data Scouting on compressed dark matter models at the CMS experiment

Compressed mass spectra models with low transverse momentum displaced leptons signature have low sensitivity for direct detection at the CMS experiment due to hard trigger constraints. It has been shown in this work that the search significance is obtained over lepton displacements of $\mathcal{O}(0.1~\text{cm})$ to $\mathcal{O}(100~\text{cm})$ by lowering the trigger $p_{T}$ threshold on the leptons to 20 GeV. The CMS experiment was undergoing an upgrade during the LHC LS2 and was under preparation for Run 3. New triggers were created for standard data collection streams of the CMS experiment in LHC Run 3 targeting displaced leptons with low-$p_{T}$ threshold on leptons. The new triggers explore isolation, shower shape and delay in the energy deposition in the electromagnetic calorimeter for electrons. The $p_{T}$ threshold on the final states $\mu ~ \mu$ and $\mu ~ e$ is lowered to 20 GeV while for $e ~ e$ is lowered to 25 and 12 GeV for the two highest energy electrons in the event respectively. Additionally, for events with additional activity such as missing energy or the presence of a jet, the threshold for electrons can be as low as 10 GeV. Additionally, the data scouting in the CMS experiment has been enhanced in the Run 3 of the LHC to include low energy electrons ($e$) and photons ($\gamma$) that allow us to lower the $p_{T}$ threshold without any additional constraints. Events with single $e/\gamma$ $p_{T}$ threshold of 30 GeV and asymmetric di-$e/\gamma$ $p_{T}$ threshold of 16 GeV and 12 GeV have been stored. The standard model particles - $J/\psi$ and $\Upsilon$ meson were observed in the di-electron invariant mass distribution along with the peak for the $Z$ boson. This is the first ever result of its kind in the CMS collaboration and opens the possibility to perform low energy searches with the electrons and photons in the scouting data collected by the CMS collaboration in Run 3.