CMS Event Evaluation Helper

Assist LHC Masterclass students in evaluating difficult iSpy events & submitting to CIMA

1. Required iSpy Settings Checklist

Configure these settings in iSpy to isolate high-energy tracks:

Detector > Hcal Outer → Show (Checked)

Tracks (reco.) → Show (Unchecked to clear yellow noise)

Physics > Missing Et → Show (Checked)

Show track curvature guide (Top Toolbar Settings for charges)

Click a scenario to auto-populate individual lepton $p_T$ and charges:

Number of Electron Tracks (Green):

Number of Muon Tracks (Red):

Missing Transverse Energy (MET / Missing Et in GeV):

Primary Recommendation: Enter event data

Candidate

Specify lepton count and track properties to generate the recommended CIMA entry.

Final State: -

Primary State: -

Calculate Invariant Mass: No

Awaiting lepton inputs...

Opposite-Sign, Same-Flavor (OS-SF) Rule: Neutral particles (NP, e.g. Z) decay into OS-SF pairs (e⁺e^- or mu⁺mu^-). Mixed flavor pairs like e⁺mu^- cannot form an NP.
Higgs 2-Pair Rule: A Higgs candidate (H → ZZ* → 4e) is composed of two OS-SF pairs: 4e = (e⁺e^-)(e⁺e^-), 4mu = (mu⁺mu^-)(mu⁺mu^-), or 2e2mu = (e⁺e^-)(mu⁺mu^-).
Automatic p_T Sorting & Background Filtering: The app ranks all tracks by p_T. If a pair of OS-SF leptons has p_T much above the others, the lower p_T tracks are treated as soft background/pileup.
MET Threshold: MET above 25 GeV indicates an invisible neutrino (e.g. W → e nu).
CIMA Constraint: Select exactly 1 primary process per event.