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Comprehensive Overview of Available CMS Data Sets for Particle Physics Analysis

This document details extensive available data sets from the Compact Muon Solenoid (CMS) experiment, focusing on various event types, including di-muon and di-electron events, Higgs candidates, and top quark analyses. Key data include 2000 di-muon and di-electron events around the J/ψ, 100,000 di-muon and di-electron events in the 2-110 GeV invariant mass range, and 500 events of W boson decays. Additionally, the document outlines the methodology for analyzing top quark events, including diagnostic plots and plans for future research activities, aimed at enhancing the content and understanding of the data.

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Comprehensive Overview of Available CMS Data Sets for Particle Physics Analysis

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  1. CMS Data Analysis

  2. Available Data Sets • 2000 di-muon events around the J/ψ • 2000 di-electron events around the J/ψ • 2000 di-electron events around the Υ • 100,000 di-muon events in the invariant mass range 2-110 GeV • 100,000 di-electron events in the invariant mass range 2-110 GeV • 500 di-electron events around the Z boson • 500 di-muon events around the Z boson • 500 events of W to eν • 500 events of W to μν • 13 Higgs candidate events: H to γγ, 4e, 2e2μ, 4μ • ~50 1/pb single muons for top quark analysis (508,561 events)

  3. Available Data Sets • 2000 di-muon events around the J/ψ • 2000 di-electron events around the J/ψ • 2000 di-electron events around the Υ • 100,000 di-muon events in the invariant mass range 2-110 GeV • 100,000 di-electron events in the invariant mass range 2-110 GeV • 500 di-electron events around the Z boson • 500 di-muon events around the Z boson • 500 events of W to eν • 500 events of W to μν • 13 Higgs candidate events: H to γγ, 4e, 2e2μ, 4μ • ~50 1/pb single muons for top quark analysis (508,561 events)

  4. Available Data Sets • 2000 di-muon events around the J/ψ • 2000 di-electron events around the J/ψ • 2000 di-electron events around the Υ • 100,000 di-muon events in the invariant mass range 2-110 GeV • 100,000 di-electron events in the invariant mass range 2-110 GeV • 500 di-electron events around the Z boson • 500 di-muon events around the Z boson • 500 events of W to eν • 500 events of W to μν • 13 Higgs candidate events: H to γγ, 4e, 2e2μ, 4μ • ~50 1/pb single muons for top quark analysis (508,561 events)

  5. Whythe tt̄ Data Set? • Reasons for chosing the tt̄ data set: • well-designed accompanying activity • activity requires use of simulated data to determine cuts and efficiencies • provides an opportunity to learn Linux, C++, and ROOT

  6. Preparatory Activity • Dan Karmgard downloaded data and several example programs to his local Linux machine • created individual accounts for each member of the group • We used MobaXterm to give us virtual terminals on that machine to access the data • We studied C++ for aproximately two weeks before starting work with ROOT

  7. tt̄ Events

  8. Beginnings of Top Analysis:Diagnostic Plots • The following plots demonstrate that we can access, read, and histogram data using ROOT

  9. Beginnings of Top Analysis:Diagnostic Plots • Muons

  10. Beginnings of Top Analysis:Diagnostic Plots • Electrons

  11. Beginnings of Top Analysis:Diagnostic Plots • Photons

  12. Beginnings of Top Analysis:Diagnostic Plots • Jets

  13. Beginnings of Top Analysis:Diagnostic Plots • MET

  14. Dimuon Mass Plots

  15. Enriching the Top Content of the Data Sample: Strategy • Identify measured quantities that allow us to distinguish between tt̄ events and expected background • Number of simulated events • tt̄: 383,167 (signal) • Drell-Yan: 109,656 (background) • W + Jets: 76,196 (background) • QCD: 137 (background) total: 569,156

  16. Enriching the Top Content of the Data Sample

  17. Enriching the Top Content of the Data Sample • NJets

  18. Enriching the Top Content of the Data Sample • bTags

  19. Enriching the Top Content of the Data Sample • MET

  20. Enriching the Top Content • Angular Distribution

  21. Plans for Next Summer • Continue tt̄ analysis • Develop a set of cuts • Determine efficiencies • Create tt̄ mass plots • Calculate tt̄ cross-section and mass

  22. Conclusions • We’ve made substantial progress toward analyzing CMS data in its native format • We are in a good position to finish the tt̄ analysis by the end of next summer • We are better poised to access and analyze CMS data in general • In celebration of CERN’s 60th anniversary, CMS is releasing 27.3 Terabytes of data in September 2014 • We plan to be ready!

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