comparison of em-objects between 1.5 and 2.5 pedestal cut. emid meeting
DESCRIPTION
Comparison of EM-objects between 1.5 and 2.5 pedestal cut. Emid Meeting. Jean-Roch Vlimant LPNHE november 7, 2002. Analysis code from Robert & Marumi p10.15 results for Z and W Comparison for run 162594 of Emid objects, Z and W distributions. p10.15 analysis. - PowerPoint PPT PresentationTRANSCRIPT
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Comparison of EM-objects between 1.5 and 2.5 pedestal
cut.
Emid Meeting
Jean-Roch Vlimant
LPNHE
november 7, 2002
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Analysis code from Robert & Marumi– p10.15 results for Z and W
Comparison for run 162594 of Emid objects, Z and W distributions.
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p10.15 analysis
From Robert & Marumi W and Z stream files Using their analysis framework Using
EMid cutspT>25 GeV EMfrac>0.9 isolation<0.15 Hmatrix<20 W cut ET > 20 Gev
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Z peak
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W transverse mass
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p11 data Run 162594 taken 1.5 online
– p11 reconstruction recoA_reco_all_0000162594_0**.raw_p11.11.00.root
– 2.5 (~2.1) offline cut + p11 reconstruction recoA_reco_all_0000162594_0**.raw_s11.11.00-1.5.root
MISSING/ZOMBIE: 02,10,16,20,22,36,38,40,41,48,50,55,73,86,87,90
Cuts– Candidates : |id|=11,10
– Good candidates : EMfrac>0.9 isolation<0.15 Hmatrix<50
– Electrons : |id|= 11
– Z : pT>25 GeV ntrack=0,1,2
– W : ET>20 GeV
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Effect on candidates2.51.5 : loosing 47% of candidates (68407 35877)
loosing events with multiple candidates.
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Effect on good candidates2.51.5 : loosing 25% (32622468)
Hm8<20 22% (19051477)
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Effect on electrons2.51.5 : loosing 19% (1010821)
same number of events with 2 electronsHm8<20 17% (462387)
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Effect on Emfraction1.5 widens the distribution, more evts at EMfrac>1 and
below 0.9
CUT
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Effect on Emfraction1.5 evens the distribution, gain below 0.9 responsible
for loss of good candidates.
CUT
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Effect on isolationSmeering towards high isolation for 1.5 responsible for
loss of candidates
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Effect on Hmatrix1.5 increases Hmatrix peaks around 10 and 60
CUT
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Effect on pT2.51.5 : Loose small pTs
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Effect on pT2.51.5 : Loose small pTs
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Effect on the di-em eventsnot enough statistics
loss of 5 events from good candaidates
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Effect on W transverse massAdd event from good candidates before kinematical edge due to ET increasing
~20
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Conclusions from 2.5 to 1.5
Loose 50% of candidates to EMid - need better understanding of isolation.
Loose 25% of good candidates(10,11) – due to Emfrac and isolation, gain for Hmatrix depends on cut value.
Loose 18% electrons(11)- but better identification rates from candidates.
Loose few di-em ? - not enough stats to state.
Add background to W transverse mass distribution
www-d0.fnal.gov/~vlimant/Meeting/CONTRIB/EmidMeeting1.pptwww-d0.fnal.gov/~vlimant/Wps/1.5-2.5sigma-study/nostream/*.ps
www-d0.fnal.gov/~vlimant/Wps/1.5-2.5sigma-study/*.ps