Difference between revisions of "Analysis Tools"
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| − | |(DL.edtpl==0)&&((DL.evtypebits&(1<<3))==(1<<3)) || Taken as a whole, this is the good electron trigger (T3) cut. The first component of the cut removes the dead-time pulse trigger. The latter requires that a good trigger from the LHRS was generated (that is, a coincidence between the S1 and S2m scintillating planes => S1.AND.S2). | + | | style=white-space:nowrap | (DL.edtpl==0)&&((DL.evtypebits&(1<<3))==(1<<3)) || Taken as a whole, this is the good electron trigger (T3) cut. The first component of the cut removes the dead-time pulse trigger. The latter requires that a good trigger from the LHRS was generated (that is, a coincidence between the S1 and S2m scintillating planes => S1.AND.S2). The efficiency of the T3 trigger is discussed [http://www.jlab.org/~flay/thesis/tech_notes/trig_note.pdf here]. NOTE: Be careful concerning the use of the parentheses! |
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| L.tr.n==1 || The one-track event cut. We choose only those particles for which the VDCs have assigned one good track to. The efficiency of this cut is discussed [http://www.jlab.org/~flay/thesis/tech_notes/vdc_note.pdf here]. | | L.tr.n==1 || The one-track event cut. We choose only those particles for which the VDCs have assigned one good track to. The efficiency of this cut is discussed [http://www.jlab.org/~flay/thesis/tech_notes/vdc_note.pdf here]. | ||
Revision as of 09:19, 14 April 2011
Contents
Description
This page contains a glossary of cuts used in the d2n analysis for both the LHRS and BigBite detectors.
LHRS
The list of cuts below are presented in the form in which they are used in ROOT macros when carrying out calculations. These variable names are compatible with the Hall A Analyzer.
Electron Cuts
| Cut | Description |
|---|---|
| (DL.edtpl==0)&&((DL.evtypebits&(1<<3))==(1<<3)) | Taken as a whole, this is the good electron trigger (T3) cut. The first component of the cut removes the dead-time pulse trigger. The latter requires that a good trigger from the LHRS was generated (that is, a coincidence between the S1 and S2m scintillating planes => S1.AND.S2). The efficiency of the T3 trigger is discussed here. NOTE: Be careful concerning the use of the parentheses! |
| L.tr.n==1 | The one-track event cut. We choose only those particles for which the VDCs have assigned one good track to. The efficiency of this cut is discussed here. |
| L.cer.asum_c>400 | The gas Cherenkov ADC cut. The gas Cherenkov was calibrated so that the one photoelectron peak is centered at 200 ADC channels. PID cut efficiency studies show that the optimal cut position is at 400 ADC channels (2 photoelectrons). |
| abs(L.cer.t[i]-mean)<lim | The gas Cherenkov TDC cut. This cut is to accompany the above ADC cut. Note that this is a sum over i PMTs from 0 to 9. `mean' is the mean TDC peak position while `lim' is the cut window (in TDC channels). It is best to determine each of the i PMT mean peak positions for each run. |
