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Feasibility of Detecting Leptoquarks With the CDF Detector Althea Moorhead Mentor: Darin Acosta
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Outline Background: What is a leptoquark? Leptoquark production and previous work Results & Calculations Conclusions
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The Standard Model Quarks, leptons, and gauge particles (force carriers) Arranged into three generations Why is there a correlation between quarks and leptons?
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Leptoquarks Predicted by grand unified theories, supersymmetry, and string theory Would be bosons Would have characteristics of both quarks and leptons
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Leptoquark Production Gauge Coupling Mediated by gauge bosons Yukawa Coupling Direct fusion of a lepton and a quark
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The Tevatron Proton-antiproton collider Energy of 1 TeV (most energetic in the world) Run 1: 100 pb -1 Run 2: 2000 pb -1
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The CDF Detector Tracking chamber maps the trajectories of charged particles Calorimeters measure particle energies
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Background: Current Leptoquark Limits Leptoquarks decay into a lepton and a quark. Probability of that lepton being charged is the branching ratio . Interested in region of small .
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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
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Missing Transverse Energy LeptoquarkBackground
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Table of Expected Events TypeNobs Leptoquark:100 GeV58 150 GeV14 Background:QCD195 W100 W+jets67 Z36 Z+jets20 Top quark7
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Sensitivity vs. Missing Energy The statistical significance: Statistical significance not very dependent on the missing energy
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Sensitivity vs. Min. Jet Energy Statistical significance is dependent on the minimum jet energy Peak at about 35 GeV
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Other Cuts
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Cross Section Upper Limits Find upper limits on leptoquark events, then:
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Projected New Limits
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Mass Limit vs. Luminosity
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Conclusions Results consistent with previous work Experimental data will change these results somewhat Could be improved with heavy flavor tagging
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