Neutral Current: Ongoing Systematic Studies

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Neutral Current Ongoing Systematic Studies
Ricardo Gonçalo for Alexander Kappes Henning
Schnurbusch Matthias Moritz
SFEW Review Meeting 18th September 2001

• Photoproduction normalisation Alexander (98/99)
  Henning (99/00, no plots yet)
• QED Compton and electron energy smearing
  Matthias
• First inner ring and hadronization Ricardo

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Photoproduction Normalisation 1998/99 e-p
Event Selection DST-bit 12 Q2 gt 120
GeV2 E(lumi-?) lt 2 GeV 5 lt E(lumi-e) lt 15 GeV ET
gt 30 GeV z-vertex lt 50 cm Ecalelectrongt 10 GeV
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Photoproduction Normalisation 1998/99 e-p
Before Ecalelectrongt 10 GeV cut
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Photoproduction Normalisation 1998/99 e-p
tagged data
Scaled tagged data
Tagged data
MC cross section not corrected for generator
level cuts
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Hadronization hadronic energy flow
Hadronic energy flow average energy deposit per
event in cells/islands, calculated in bins of
polar angle/pseudo-rapidity (dE/d? ),(dE/d?) ?
E(? , ? ) / N Cells E gt 80 MeV (EMC cells) / 140
MeV (HAC cells) Islands remaining after
CorAndCut correction/backsplash cut
Pre-FPCHOT bug fix
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Hadronization hadronic energy flow
Pre-FPCHOT bug fix
?Ariadne (CorAndCut) seems to describe the data
well to first approximation
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Hadronization hadronic energy flow
Ratio Plots (dE/d? ) data - (dE/d? ) MC /
(dE/d? ) MC
Pre-FPCHOT bug fix
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Hadronization hadronic energy flow
Pre-FPCHOT bug fix
?2 problems FCAL Inner Ring and MEPS bias
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Hadronization hadronic energy flow and FCAL
Inner Ring
Energy flow in FCAL 10 cm radial bins
FPCHOT bug fix for Ariadne only
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Hadronization hadronic energy flow and FCAL
Inner Ring
FPCHOT bug fix for Ariadne only
? Ariadne not good in 1st IR MEPS closer to data
but still not perfect
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Hadronization hadronic energy flow and FCAL
Inner Ring
Energy flow in BCAL bias in MEPS Ariadne looks
OK
FPCHOT bug fix for Ariadne only
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Hadronization hadronic energy flow and FCAL
Inner Ring
FPCHOT bug fix for Ariadne only
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Hadronization hadronic energy flow and FCAL
Inner Ring
Ariadne reproduces the data except in FCAL 1st
IR This affects low y / high x / low ?had Need a
good systematic error estimation in IR
- remove IR energy from DA calculations for ?had
gt 0.314rad ? - vary energy scale in IR ? - take
cells for low ?had or do W cut à la 96/97 ? -
Vary remnant parameters in Monte Carlo ? To
do Use all MC for better stats Redo properly
with CureMyCalDoc Check Monte Carlo with ?
remnant parameters