Cluster selections and signal/background comparison

The following selections are used to create track/pi0 clusters:

  • standalone CES pi0’s with correction for track overlap, pT>500 MeV
  • seed track with pT>2.5 GeV
  • if pT(seed)<10 GeV use low pT track selection (defined below)
  • if 10<pT(seed)<20GeV use OR of high and low pT track selection.
  • if pT(seed)>20 GeV use high pT track selection
  • seed track cannot be an identified tight central electron or muon
  • |z0(seed)|<60 cm
  • |d0(seed)|<0.2 cm
  • 9 cm<zCES(seed)<230 cm
  • pT(shoulder)>2.0 GeV
  • N(COT hits total for shoulder track)>5

Low pT track selection

  • N(COT Axial hits)>19
  • N(COT Stereo hits)>19
  • N(COT Axial segments w/ 6 hits)+ N(COT Stereo segments w/ 6 hits)>1

Hi pT track selection

  • N(COT axial segments w/ 5 hits)>2
  • N(COT stereo segments w/ 5 hits)>1

Signal/Background Comparison Plots

Met:

Met
Ht:
ht
N(TP0):
nTP0

pT(TP0):

pT
M(TP0):
M(TP0)
M(2 TP0):
M(2 TP0)
MT(TP0+Met):
MT(TP0+MET)
1st mechanical longitudinal moment of clusters:
kpar