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Diphoton + MET Analysis Update Bruce Schumm UC Santa Cruz / SCIPP 9 April 2013 JET-MET Meeting
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.
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
MET performance of new variables, vs. old: MC • Gamma-gamma MC; 18 GeV filter • Limited tails for LocHadTopo (more stats on way…) p1328 Others LocHadTopo p1181
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
Control Samples: MC • EGamma10NoTauLoose in p1328
Control Samples: MC • LocHadTopo in p1328
Control Samples: MC • MetRefFinal in p1328
Control Samples: DATA • QCDg • Significant change between p1181 and p1328 p1181 p1328 P1328 MetRefFinal
Control Samples: DATA • QCDtg • Significant change between p1181 and p1328, although not as much as for QCDg
Control Samples: DATA (shows higher MET) • EGamma10NoTauLoose in p1328 Good proxy for signal? Signal (blinded)
Control Samples: DATA (shows higher MET) • LocHadTopo in p1328
Control Samples: DATA (shows higher MET) • MetRefFinal in p1328 • Again QCDtg looks OK but QCDg not as good
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