Post on 02-Jan-2016
description
Diphoton + MET Analysis Update
Bruce Schumm
UC Santa Cruz / SCIPP
9 April 2013 JET-MET Meeting
03 April 2013 2
In January, we were preparing to unblind our two strong-production analyses
Many studies had been done and we were addressing finer points in assuring that backgrounds were understood
We were then asked to move to p1328
EGamma10NoTauLooseRef had been chosen for p1181 after substantial study
Studies needed to be redone for p1328; several questions raised that we have been exploring since then
This update will be solely on our MET studies & status since then.
03 April 2013 3
03 April 2013 4
03 April 2013 5
03 April 2013 6
MET performance of new variables, vs. old: DATA
• Points are p1181 EGamma10NoTauLooseRef (prior chosen variable)
• LocHadTopo did not change between p1181 and p1328
Numbers of events in last two bins
Tight-tight (signal) sample, blinded for MET>100
03 April 2013 7
LocHadTopo
Others
p1328
p1181
MET performance of new variables, vs. old: MC• Gamma-gamma MC; 18 GeV filter
• Limited tails for LocHadTopo (more stats on way…)
03 April 2013 8
Control Samples: MC• Signal (gg,GG) is from gamma-gamma MC
• Control samples (QCDtg, QCDg) from gamma-jet MC
• Control photon in control sample NOT ISOLATED
Proposed nominal control sample
03 April 2013 9
Control Samples: MC
• EGamma10NoTauLoose in p1328
03 April 2013 10
Control Samples: MC
• LocHadTopo in p1328
03 April 2013 11
Control Samples: MC
• MetRefFinal in p1328
03 April 2013 12
Control Samples: DATA
• QCDg
• Significant change between p1181 and p1328
p1181
p1328
P1328 MetRefFinal
03 April 2013 13
Control Samples: DATA
• QCDtg
• Significant change between p1181 and p1328, although not as much as for QCDg
03 April 2013 14
Control Samples: DATA (shows higher MET)
• EGamma10NoTauLoose in p1328
Signal (blinded)
Good proxy for signal?
03 April 2013 15
Control Samples: DATA (shows higher MET)
• LocHadTopo in p1328
03 April 2013 16
Control Samples: DATA (shows higher MET)
• MetRefFinal in p1328
• Again QCDtg looks OK but QCDg not as good
03 April 2013 17
CONCLUSIONS/OUTLOOK FOR p1328
Hope to get more statistics for gamma-gamma MC by raising filtering thresholds; being generated now. But for now:
LocHadTopo• Has smallest tails for tight-tight sample• All control samples look very good (including high-statistics QCDg-noIso, which was used for 7 TeV)
MetRefFinal• Bigger tails for tight-tight sample• QCDtg-noIso and QCDg-iso control samples look OK
EGamma10NoTauLoose• Bigger tails• No acceptable control samples
03 April 2013 18