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Electroweak bosons  .

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Presentation on theme: "Electroweak bosons  ."— Presentation transcript:

1 Electroweak bosons

2 The accelerator complex

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

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

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

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

7 Z0 discovery paper Phys.Lett. B126 (1983) UA1 collaboration

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

9 The Z0 resonance

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

11 e+e-  Z0  Hadrons

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