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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

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

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

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

8

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

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

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

12 The Z0 resonance

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

14 e+e-  Z0  Hadrons

15


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