CMS Run 3 LLP/MDS Analysis

Skimming datasets

• skim_csccsc.py
• skim_cscdt.py

Notebooks

• split_met.ipynb
• --cscdt_cuts.ipynb--
• closure_test.ipynb
• datacard_scan.ipynb

Setting Up the Environment on lxplus

• log in a lxplus8 machine
• Do cmsenv in a CMSSW_14_X release
• Run the .py script: python3 <script.py>

Program Flow

First, run rdf_hlt_builder.py to load and add the HLTDecision branch to the ntuple.

Use skim_cscdt.py to reduce the large MuonSystem TTree to a flattened TTree with only 1 CSC cluster and only 1 DT cluster. This allows for easy analysis using RDataFrames

Applies the following cuts: 0. Matches gen LLP with reco LLP (MC only)

1. HLT Selections for 1 CSC + 1 DT
2. L1 Trigger on the CSC clusters
3. Requires the CSC clusters to be in-time
4. Requires the DT clusters to be in-time
5. Rejects DT clusters with MB1 hits
6. Rejects clusters matched to jets
7. Rejects clusters matched to muons
8. Beam halo selection

If there are more than 1 CSC or 1 DT clusters, the largest cluster selected to as the LLP candidate.