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p. p. A Schematic detector. Muon detector. Calorimeter Induces shower in dense material. Tracking system Magnetized volume. Interaction point. Innermost tracking layers use silicon. EM layers fine sampling. Absorber material. Hadronic layers. Electron.
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p p A Schematic detector Muon detector Calorimeter Induces shower in dense material Tracking system Magnetized volume Interaction point Innermost tracking layers use silicon EM layers fine sampling Absorber material Hadronic layers Electron Experimental signature of a quark or gluon Jet: q or g Bend angle momentum Muon “Missing transverse energy” Signature of a non-interacting (or weakly interacting) particle like a neutrino
Jet Production 1.3R 2R
Advantages (re e+e-) High Energy Hard Scatter is QCD Disadvantages (re e+e-) Don’t know what’s colliding Underlying Event Hard Scatter is QCD UnderlyingEvent g q u u q d u d u Hard Scatter Collisions at the Tevatron proton anti-proton
DQH(z) • M(Q) >> qcd means • perturb calc for (NLO is normal) • higher order effects from dep on R,F • Universal non-perturb parts • PDFs and fragmentation • take from other meas’s • or meas using Q-prod A fi (x1) Hard Interaction B fj (x2) Incoming Particles Parton Shower / Fragmentation Arbitrary Definitions: Heavy Flavor c and b