Repository of analysis cuts
This page documents the most important set of cuts that we reoutinely use for analysis in the beam test
System test - updated 26/11/2007
- Look only good events with one track and a hit in the last tracaker layer
kBaseCut = 'TkrNumTracks>=1 && Tkr1LastLayer==0' - Time between two events has to be greater than 1ms to cure the pedestal drift issue
kDataCut = '(GemDeltaEventTime*50/1000000)>1. && EventGtccFifo==0' - Process fiducial cuts (Nicola's cuts) to remove double particles
kEMaxCut = 1.e6
if kEnergy>2500 :
kBaseCut += '&& CalEnergyRaw>200'
if (kEnergy == 500 ):
kEMaxCut = 445./kAbsCosAngle
elif (kEnergy == 1000 ):
kEMaxCut = 900./kAbsCosAngle
elif (kEnergy == 2500 ):
kEMaxCut = 2200./kAbsCosAngle
elif (kEnergy == 5000 ):
kEMaxCut = 4500./kAbsCosAngle
elif (kEnergy == 10000 ):
kEMaxCut = 9000./kAbsCosAngle
elif (kEnergy == 20000 ):
kEMaxCut = 17000./kAbsCosAngle
elif (kEnergy == 49980 ):
kEMaxCut = 44000./kAbsCosAngle
elif (kEnergy > 90000. and kEnergy < 100000):
kEMaxCut = 90000./kAbsCosAngle
elif (kEnergy > 190000. and kEnergy < 201000.):
kEMaxCut = 140000/kAbsCosAngle
elif (kEnergy > 270000. and kEnergy < 300001.):
kEMaxCut = 180000/kAbsCosAngle
kBaseCut += '&& CalEnergyRaw<%s' % kEMaxCut
TKR hits and PSF analysis
A1 events
VtxNumVertices==1 && Tkr1LastLayer == 0 && Tkr2LastLayer == 0 && Tkr1FirstLayer >1 && Tkr2FirstLayer > 1 && (VtxStatus&0x0002)>0 && CalCsIRLn>6
A21 events
Tkr1LastLayer == 0 && Tkr1FirstLayer > 1 && (VtxStatus&0x0001)>0 && CalCsIRLn>6
Nicola's Cuts:
A.1.1 events
VtxNumVertices==1 && TkrNumTracks == 2 && Tkr1LastLayer == 0 && Tkr2LastLayer == 0 && Tkr1FirstLayer >1 && Tkr2FirstLayer > 1 && (VtxStatus&0x0002)>0 && CalCsIRLn>6
A.2.1 events
VtxNumVertices==1 && TkrNumTracks == 1 && Tkr1LastLayer == 0 && Tkr1FirstLayer > 1 && (VtxStatus&0x0001)>0 && CalCsIRLn>6
Neutral vertex issue for A.1 class:
Do not use "VtxNumVertices", "(VtxStatus&0x0002)>0 && TkrNumTracks==2" give the same result.
Notice that the Neutral Vertex bit (0x8) of "VtxStatus" is ALWAYS 0 because it refers ti the best vertex which is never the neutral one.