Inside the Tevatron Main Ring

Detection of a top/antitop event

Top/antitop event in the D0 detectorRun 92704, Event 14022

Steps in Analysis of Events

• Identify jets and muons and write energies in table.• Measure and record angles of jets and muons

counterclockwise from +x axis.• Draw vectors in rectangular space or on graph paper

using head-to-tail method. Represent momentum of 10 GeV/c as 1.0 cm arrow.

• Neutrino energy in GeV is the length of the arrow you must draw in order to make the total pT = 0.

• Add all of the jet, muon, and neutrino energies and divide the sum by two to get the top quark mass.

GOOD LUCK!!

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