MuonTrigger

The purpose of the Level 1 muon trigger is to provide single and dimuon objects for the L-1 decision.
The muon system is composed of wire chambers and scintillators stacked radially from the interaction point. In the central most region ( |eta| < 0.6) a muon from the interaction region encounters the central tracker, the hadron calorimeter, the projective wires of the CMU, the half staggered chambers of the CMP and the CSP scintillators.
Beyond the central most region in eta a muon traverses the central tracker, the hadron calorimeter and the wire chambers and scintillators of the central muon extension, CMX/CSX.

The signal flow begins with the generation of candidate track primitives, separately in each detector element.

The primitives are derived from single hits or coincidences of hits for the scintillators of the muon system. For the wire chambers the primitives are derived from patterns of hits or from pairs of hits on projective wires with the requirement that the difference in the arrival times of signals be less than a preset threshold.
This maximum allowed time difference imposes a minimum Pt requirements for hits from a single track.

Code

The following classes have been designed and coded (package MuonTrigger):

MuonTriggerMaker main driver
MuonTriggerData the data object containing arrays of muon primitivies;
MuonPrimitiveType0 CMU primitive
MuonPrimitiveType1 CMX primitive
MuonPrimitiveType2 CMP
MuonPrimitiveType3 CMP/CSP matches(only describe the lower 24 bits).
MuonPrimitiveType4 operator bits;
MuonPrimitiveType5 calorimeterSignal

Further informations

Further information on the muon system and its emulation can be found at: http://ncdf70.fnal.gov:8001/trigsim/trigsim_sep01/sld013.htm and following slides.

Questions? Send e-mail to MuonTrigger team or TRGSim team

Last updated Sept 04 2001; Simona Rolli