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Search for Chargino and Neutralino in the low p T e μ channel -- STATUS --. Melisa Rossi Udine University September 18, 2006. So Far. Last update at SUSY Meeting in Feb 2006 Spring: dedicated to my Ph.D. Thesis Summer: the group decided to start processing the new data
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Search for Chargino and Neutralino in the low pT eμ channel-- STATUS -- Melisa Rossi Udine University September 18, 2006 SUSY Meeting
So Far... • Last update at SUSY Meeting in Feb 2006 • Spring: dedicated to my Ph.D. Thesis • Summer: the group decided to start processing the new data • Adapt 6.1.4 NT code to SL3 • About 90% of edil0h data done • About half of sexoat NT done • New bbbar done by Giovanni to be ntuplized SUSY Meeting
Data and MC • Data • SUSY dilepton dataset edil0d • Good run list v7 no silicon (~310pb-1), CEM4_CMUP4 trigger • MC • Signal point (m0=100,m1/2=180,A0=0,tanβ=5,μ>0)~360fb-1 • DY sexo9t (Z ll, Mll>5GeV/c2)~5fb-1 • ttbar (ttopel)~170fb-1 • WW (wtop1w)~34fb-1 • ZZ (Oscar)~535fb-1 • WZ (Madgraph)~430fb-1 • bbbar (Giovanni)~150pb-1 (last time was ~50pb-1) • Fakes • using CEM8 and CMUP8 inclusive samples • Lepton+fake selection requiring events with • real first lepton (CEM8 for eμ and CMUP8 for μe) • fake lepton using Liverpool method SUSY Meeting
Event Selection • Events with 1 electron and 1 muon • Leading lepton pT>10 GeV/c • Next-to-leading lepton pT>5 GeV/c • High pT (>20GeV/c) CEM and CMUP selection • Standard top/ewk definition • 4-20GeV/c pT range • Muon ID as in CDF 7197 (Purdue) • Electron ID as high pT SUSY Meeting
MET ?? SIGNAL REGION if 3 leptons 15 10 < 2 > 1 Number of Jets 15 76 106 M() Control Regions (CR) • CR in terms of • missing ET (high, low) • Njet(high, low) • number of leptons • 2 lepton selection • 3 lepton selection • separating events between • like sign (LS) and opposite sign (OS) charge • Additional high statistics CR to test lepton selection • ee and μμ events • full invariant mass spectrum • Z window mass SUSY Meeting
Control Regions (eμ) OS LS 2 lepton selection MET ?? 15 10 < 2 > 1 Number of Jets SUSY Meeting
Control Regions (eμ) OS 2 lepton selection MET ?? 15 10 LS < 2 > 1 Number of Jets SUSY Meeting
Control Regions – Summary SUSY Meeting
whole eμ selection • Possible fakes underestimation in the low missing transverse energy • Looked into ee and μμ events separating OS and LS OS LS SUSY Meeting
15 76 106 M() Control Regions (ee, μμ) OS ee OS μμ SUSY Meeting
15 76 106 M() Control Regions (ee, μμ) LS ee LS μμ SUSY Meeting
Conclusions • After Ph.D. and data processing I am back into the analysis.... • Need to finish to understand fakes • similar problem into ee and μμ events • Ahead with new data NT • want to check if the fake problem is also there • Plan • Still want to bless the first part of data this Fall • Meanwhile looking at the new data • Need also to move 533 code to 534gcc1 by end of September • I am coming to Fnal first 2 weeks of October! SUSY Meeting