5. Physik des Z 0 -Bosons
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1 5. Physik des Z 0 -Bosons Gruppe Kopplung Felder Generatoren physikalische Teilchen SU(2) L g Glashow-Salam-Weinberg-Theorie (GSW) W 1 μ τ 1 W 2 μ τ 2 W 3 μ τ 3 ± 1 W μ = μ ± 2..?. Z μ U(1) Y g B μ Y..?. A μ ( ) 1 2 W W μ Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 1
2 5.1 Entdeckung des Neutralen Stroms (NC) The Gargamelle chamber Date: Oct 1973 A hadron event - a neutrino interacting with a nucleon and emerging as a neutrino : first observation of "neutral currents" in the Gargamelle heavy liquid bubble chamber. Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 2
3 NC: leptonisches Ereignis ν μ ν μ e Z 0 e Date: 1973 A lepton event - a neutrino interacting with a electron and emerging as a neutrino : first observation of "neutral currents" in the Gargamelle heavy liquid bubble chamber. In the photograph, an unseen neutrino interacts with an electron and emerges as a neutrino instead of changing into a muon - what is seen (horizontally) is the track of the electron. This lepton event offers proof of the existence of neutral currents. Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 3
4 Neutrino-Strahlen (Beispiel CNGS) Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 4
5 Direkte Erzeugung des Z 0 -Bosons First candidate Z event at UA1, Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 5
6 5.2 Resonante Erzeugung des Z 0 -Bosons in e + e - Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 6
7 LEP/SLC-Ergebnisse Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 7
8 Schwacher Isospin und NC-Kopplungen Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 8
9 Z 0 -Zerfälle bei LEP Z 0 e + e Z 0 qq Z 0 τ + τ Z 0 qqg Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 9
10 Z 0 -Resonanz Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 10
11 Flavour-Tagging Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 11
12 Anzahl der Neutrinoarten Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 12
13 Partielle Breiten Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 13
14 5.4 Lorentz-Struktur der Z 0 -Kopplung cosθ-verteilung Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 14
15 FB-Asymmetrien Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 15
16 FB-Asymmetrien Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 16
17 τ-polarisation Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 17
18 LR-Asymmetrien (SLC) Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 18
19 polarized positrons polarized positrons: production and measurement of polarization before the main linac, i.e. at low energies A: production of polarized photons by means of the helical undulator B: production of polarized positrons by polarized photons e- beam undulator photons result: 0.5 X0 W (Tungsten) -> E166 Polarized γ beam From the Helical Undulator e e+ e e e e X0 W (Tungsten) = 3.5 mm Polarization transfer in e+ e- pair creation e- e Positron Polarization profile created by the undulator photons C: measure the polarization degree at different energies Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 19
20 g V, g A Messungen Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 20
21 g V, g A Messungen vor und nach LEP Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 21
22 Sensitivität der Asymmetrien auf sin 2 θ W Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 22
23 Strahlungskorrekturen: Präzisionstests Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 23
24 The Standard Model is a non-trivial structure with a few constants showing up in many places: Many opportunities to check! In perturbation theory all these parameters tend to get connected and influenced by the mass scale they are considered at Tests of the Standard Model - EPS July 25 - Sijbrand de Jong From Diagrammatica by M. Veltman (typo s=my problem) Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 24 24
25 Einschränkungen für die Higgs-Masse Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 25
26 Übereinstimmung mit dem SM Hermann Kolanoski, EEP SS06-4.Neutrino-Oszillationen 26
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