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Feasibility of Detecting Leptoquarks With the CDF Detector

This research explores the potential for detecting leptoquarks using the CDF Detector at the Tevatron proton-antiproton collider. The study includes background information, leptoquark production, previous work, and calculations. Results and conclusions are presented, along with the potential for improved detection with heavy flavor tagging.

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Feasibility of Detecting Leptoquarks With the CDF Detector

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  1. Feasibility of Detecting Leptoquarks With the CDF Detector Althea Moorhead Mentor: Darin Acosta

  2. Outline • Background: What is a leptoquark? • Leptoquark production and previous work • Results & Calculations • Conclusions

  3. The Standard Model • Quarks, leptons, and gauge particles (force carriers) • Arranged into three generations • Why is there a correlation between quarks and leptons?

  4. Leptoquarks • Predicted by grand unified theories, supersymmetry, and string theory • Would be bosons • Would have characteristics of both quarks and leptons

  5. Leptoquark Production • Gauge Coupling • Mediated by gauge bosons • Yukawa Coupling • Direct fusion of a lepton and a quark

  6. The Tevatron • Proton-antiproton collider • Energy of 1 TeV (most energetic in the world) • Run 1: 100 pb-1 • Run 2: 2000 pb-1

  7. The CDF Detector • Tracking chamber maps the trajectories of charged particles • Calorimeters measure particle energies

  8. Background: Current Leptoquark Limits • Leptoquarks decay into a lepton and a quark. • Probability of that lepton being charged is the branching ratio b. • Interested in region of small b.

  9. Procedure • Simulate leptoquark and background events • PYTHIA – event simulation • cdfSim – detector simulation • Production – event reconstruction • Stntuple – event analysis • Use cuts to differentiate between signal and background

  10. Missing Transverse Energy Leptoquark Background

  11. Table of Expected Events

  12. Sensitivity vs. Missing Energy • The statistical significance: • Statistical significance not very dependent on the missing energy

  13. Sensitivity vs. Min. Jet Energy • Statistical significance is dependent on the minimum jet energy • Peak at about 35 GeV

  14. Other Cuts

  15. Cross Section Upper Limits • Find upper limits on leptoquark events, then:

  16. Projected New Limits

  17. Mass Limit vs. Luminosity

  18. Conclusions • Results consistent with previous work • Experimental data will change these results somewhat • Could be improved with heavy flavor tagging

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