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EWK Drell-Yan: Status and Plans. Dimitri Bourilkov University of Florida General EWK Meeting, CERN, July 21, 2008. Drell-Yan Meetings 3 & 4. Top-pair background in e + e - - e μ study. Vincent Dero, Pascal Vanlaer top-pair background very important Can be estimated with e μ events. - PowerPoint PPT Presentation
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EWK Drell-Yan: Status and Plans
Dimitri BourilkovDimitri BourilkovUniversity of FloridaUniversity of Florida
General EWK Meeting, CERN, July 21,General EWK Meeting, CERN, July 21, 2008 2008
D.BourilkovD.Bourilkov EWK Drell-Yan: Status 2
Drell-Yan Meetings 3 & 4
D.BourilkovD.Bourilkov EWK Drell-Yan: Status 3
Top-pair background in e+e- - eμ study
• Vincent Dero, Pascal Vanlaer
• top-pair background very important
• Can be estimated with eμ events
D.BourilkovD.Bourilkov EWK Drell-Yan: Status 4
Top-pair background in µ+µ- - b tags
• Jonatan Piedra (TevMu)
• top-pair background sizable
• Estimation using b-tags
D.BourilkovD.Bourilkov EWK Drell-Yan: Status 5
Efficiency – Tag & Probe
• Chang Liu (Purdue)
• Reconstruction & Trigger efficiencies> T & P at Z peak in good shape
> To do – off peak DY
D.BourilkovD.Bourilkov EWK Drell-Yan: Status 6
Dilution Corrected AFB
• Sample size is about 50-100 pb-1 data.
• Do event-by-event correction of the dilution, select events with |y|>0.75.
Ping Tan, Dan Green
D.BourilkovD.Bourilkov EWK Drell-Yan: Status 7
Mass Resolutions & Corrections for Smearing
• Obtained the mass resolution from MC at this moment, including both momentum resolution & FSR effect.
• Core Gaussian width is
0.027+0.0104 m0
Ping Tan, Dan Green
D.BourilkovD.Bourilkov EWK Drell-Yan: Status 8
Z+Jets – PAT Analysis
• Analysis of Z+Jets (Chowder) using Physics Analysis Toolkit (PAT): Monika Jindal, Kajari Mazumdar, Jasbir Singh
• Invariant Mass Distribution of Dimuons
• Selection criteria applied : Tracker isolation has been used with
• Sumpt <3.0 Gev in deltaR = 0.3
• No. of muons must be >=2
Muons must be oppositely charged with
• cosDf between two muons <=-0.5
• Comparison of Invariant Mass for Z/tt/W + Jets process
• In case of Z+jets , there is cut of m_ll <40 and m_ll >200 at the Generation level
• (Events have been normalized to 1.0
• to compare the shape)
D.BourilkovD.Bourilkov EWK Drell-Yan: Status 9
What Next
• TWIKI page: https://twiki.cern.ch/twiki/bin/view/CMS/TWikiEWKDrellYan
• Hypernews: [email protected] • Studies with CMSSW_2_0_X well underway
• Studies with CMSSW_2_1
• PAT analyses
• Explore 10 TeV
• Run on real data including tracker from CRUZET3 and CRAFT