CMS 3D Event Display

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About

This is a browser-based event display for the CMS experiment at the LHC.

This software is part of the Quarknet project, which is published under the Fermitools License.

The 3D library was initially developed by Dean McNamee and is published under a BSD license.

Questions/comments: Tom McCauley

Reference: J.Phys.Conf.Ser. 396 (2012) 022022

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Detector Model Help

Tracker

Innermost part of CMS; samples trajectories of charged particles

ECAL (Electromagnetic Calorimeter)

ECAL Barrel: Central electromagnetic calorimeter; measures energy of electrons and photons
ECAL Endcap: Electromagnetic calorimeters at either end of CMS for measurements close to the beam axis
ECAL Preshower: Provides an initial (before the EM shower) measurement helping to discriminate between photons and (neutral) pions

HCAL (Hadron Calorimeter)

HCAL Barrel: Central hadronic calorimeter; measures energy of hadrons
HCAL Endcap: Hadronic calorimeters at either end of CMS for measurements close to the beam axis
HCAL Outer: Final HCAL layer just outside the solenoid magnet
HCAL Forward: Hadronic calorimeters farther down and very close to the beam axis

Drift Tubes (DT)

Main large central muon chambers outside the solenoid and HCAL Outer using ionization of gas to record muon hits

Cathode Strip Chambers (CSC)

Forward muon detectors

Resistive Place Chambers (RPC)

Solid state muon detectors

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Tracking Help

Tracks (reco.): All reconstructed particle tracks in the tracker
Clusters (Si Pixels): Recorded events in the innermost part of the tracker
Clusters (Si Strips): Recorded events in the tracker
Rec. Hits (Tracking): All particle hits in the tracker

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ECAL Help

Barrel Rec. Hits: Energy in a single ECAL crystal
Endcap Rec. Hits: Hits in ECAL Endcap
Preshower Rec. Hits: Hits in ECAL Preshower

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HCAL Help

Barrel Rec. Hits: Energy in a single HCAL tile
Endcap Rec. Hits: Hits in HCAL Endcap
Forward Rec. Hits: Hits in HCAL Forward
Outer Rec. Hits: Hits in HCAL Outer

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Muon Help

DT Rec. Hits: Muon hits in Drift Tubes (barrel)
DT Rec. Segments: Muon track segments in Drift Tubes (barrel)
CSC Segments: Muon track segments in Cathode Strip Chambers (forward)
RPC Rec. Hits: Muon hits in Resistive Plate Chambers (barrel)
CSC Rec. Hits: Muon hits in Cathode Strip Chambers (forward)

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Physics Objects Help

Electron Tracks (GSF): Reconstructed electron tracks in the tracker
Photons (Reco): Inferred photon trajectories
Tracker Muons (Reco): Reconstructed muon tracks in tracker
Stand-alone Muons (Reco): Reconstructed muon track segments in muon chambers
Global Muons (Reco): Reconstructed complete muon tracks
Calorimeter energy towers: Histogram "towers" to indicate energy deposits in calorimeters summed over the trajectories
Jets: Collimated groups of particles which come from strong force energy conversion to matter
MET: Missing transverse energy

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