Electroweak bosons  .

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Presentation transcript:

Electroweak bosons  

The accelerator complex http://www.nobelprize.org/nobel_prizes/physics/laureates/1984/meer-lecture.pdf

W  e + ν pneutrino pelectron θneutrino θelectron UA1 proton anti-proton Beam pipe θelectron pelectron Transverse plane

(p x sin θ) neutrino (p x sin θ) electron neutrino θneutrino θelectron

W  τ + ν 3 charged hadrons from τ (+ “missing” momentum)

The first Z0 boson observed Electron Electron CERN SppS, UA1 experiment, 30 April 1983

Z0 discovery paper Phys.Lett. B126 (1983) 398-410 UA1 collaboration

The Large Electron-Positron Collider 27 km circumference Electron against positron Centre-of-mass energy 90-209 GeV

The Z0 resonance

Number of neutrinos Measure total width from lineshape Predict hadronic cross-section for different numbers of neutrinos

e+e-  Z0  Hadrons

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