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Trigger Information in the Nano(Tag) Database

This page descibes the trigger information available for your analysis. All the variables are of type Bool, and are located in Tag Level of the database by the names in the tables below. The names are desciptions of the trigger lines they are derived from. This page contains the following information:

Level 1 Information
Level 3 Information

Very nice descriptions, along with links to helpful diagrams, can be found on the Trigger Line Definition/Convention pages from the Trigger Group.

Level 1 Trigger Information
Nano Database Variable Names

3A&B*
3B&2A&2M
3B&B*&1G
3M&D2
1B
1Y
1Y&1B
2E
1M
2M
3M
4M
M*
3M&M*
M*&A+
EM*
G*
D2
D2*+
D2*&1M
D2&1E
M*&D2*
M*&1B
M*&5U
HERinjection
LERinjection
bunchcross
lightpulser

Level 3 Trigger Information

Nano-Database Variable Name Description Prescale Factor
(2-May-2000, don't rely on this to stay constaint, but obtain the trgConfig object for current prescales)
L3OutBhabha    
L3OutBhabhaFlat    
L3OutBhabhaFlatOpr * note below  
L3OutBunch Triggers at a specific phase with respect the the ion clearing gap in the storage ring. 80
L3OutBunchOpr * note below 800
L3OutCosmic Level 3 Cosmic Trigger 1
L3OutCyclic1 Random trigger. Events passing this are mixed in as background for simulation. 1
L3OutCyclic1Opr * note below 5
L3OutDch Output of the Level 3 DCH Trigger algorithm  
L3OutDchEmcPreVeto Usually, a Bhabha veto is applied to the Dch and Emc triggers so that we don't write to tape so many Bhabhas. This line is used to save a portion of the rejected Bhabhas to study that veto (e.g., to make sure no real physics is being rejected). 50
L3OutEmc Output of the Level 3 EMC Trigger algorithm  
L3OutGammaGamma    
L3OutL1Open Prescales events from L1, without running any L3 code. Allows a measurement of L3 efficiency. 200
L3OutL1OpenOpr * note below 10000
L3OutLumi Track-based luminosity monitor - requires 2 stiff back-to-back tracks 10
L3OutRadiativeBhabha    
* All lines that end with "Opr" are further prescaled and are what is processed trough Opr. This means that there are some events are saved to the xtc file but are not further processed. Some of these events will/can be used for calibration. (e.g. the EMC is looking at the fill rate of the flat Bhabha's.)


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