The Top Quark Discovery

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Presentation transcript:

The Top Quark Discovery Mike Strauss The University of Oklahoma

CDF DØ

DØ Detector It’s a big camera that takes pictures of particle collisions

DØ Detector Multiple components with different functions Weighs 5000 tons Inspect 3,000,000 collisions/second Records 50 collisions/second 30’ 30’ 50’

Electromagnetic Calorimeter (e and g) Muon (m) chambers Charged particle tracks Neutrinos? pT  0

How quarks usually interact in the detector Remember that quarks are always confined! Hadronization q As quarks leave a collision, they change into a ‘shotgun blast’ of particles called a ‘jet’ q 

Top Quark Production and Decay

Top Decay Modes Top quark events are characterized by their decay mode 44% 15% 5% 15%

An event in the DØ Detector that looks like a top quark

Another Top Quark Candidate Event

Count the number of top quark candidates and compare with a computer simulation mt  175 GeV

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