Update on e μ /e / μ LFV resonance search

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Update on eμ/e LFV resonance search SUSY LFV group 06-05-2014

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Update on e μ /e / μ  LFV resonance search. SUSY LFV group 06-05-2014. Updates since EB3. fixed a bug on jet selection Correct 2 inconsistency on object selection among different channels (mu isolation and tau overlap removal) Apply suggestions/comments from EB3 and FAR - PowerPoint PPT Presentation

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Update on e/e/ LFV resonance search

Update on e/e/ LFV resonance searchSUSY LFV group 06-05-2014Updates since EB3fixed a bug on jet selectionCorrect 2 inconsistency on object selection among different channels (mu isolation and tau overlap removal)

Apply suggestions/comments from EB3 and FAR note structure and txt Wjet & QCD further validation & Z bkgd check in channel systematics & correlation Bayesian Vs. Frequentist method for limit extraction signal theoretical production cross-section calculation

All numbers and plots are updatedupdatesNote edition add a part for trigger efficiency (Sec. 2.1)

add a subsection for signal event selection after object selection(Sec. 3.5) add subsections for signal production cross-section (Sec. 5.2 & 5.3)

Egamma triggerMuon trigger: barrel Muon trigger: endcapTrigger efficiency study are from Trigger performance group:[58] Tricoli, A. et al., Single Electron Trigger Performance Plots. ATL-COM-DAQ-2012-146, 20 Jun 2012.[59] Muon trigger performances in 2012 (approved plots for CHEP 2013).

updatesQCD further validation

validate QCD shape with SS Vs OS (also ++ Vs. --)

Reasonable agreementupdates Wjet further charge validationConstruct a Wjet control region invert the cut on the angle phi between the leptons: dphi> 2.7 1 30 GeV (enhance W). Remove opposite sign requirement Njet< 2 (reduce ttbar). Remove Pt cut (increases statistics). all other cuts are kept the same as signal event selection

Reasonable agreementupdatesZ bkgd study in channel

It seems most of the Z bkgd events in channel are kept since a mu is mis-identified as a tau Good Z peak truth level object match also tell us the tau is from a mu fake updatesSystematics for signal search correlations between different backgrounds

Systematics for signal search systematics numbers from table 3 &7&9 in supporting note are mean values for Mll>200GeV, which are dominated by low mass region its difficult to calculate systematics in each mass window for high mass region considering the statistics

A correction factor from MCConstant number from data CRWW/Ttbar/Singletop/ZllSimilar as: y = a0 b*x x and y are anti-correlated

updatesSystematics for signal searchConstruct a control region where signal events are rejected, comparing data Vs. MC and take the difference as systematics invert the cut on the angle phi between the leptons: dphi> 2.7 1