Asymétrie Matière

Comprend-on aujourd’hui
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Big-Bang Nucleosynthesis
Predictions and observational status
10-5
10-9
10-10
A. Coc et al., 2004
A. Coc, 2007
10
Weak interactions decoupling
Example of important changes induced by linear scale factor
Weak interactions decoupling:
Standard model: 1 MeV
Dirac-Milne: 80 keV
Neutrinos decoupling after e+e- annihilation
Neutrino background temperature same as
CMB (Lohiya et al. 98)
Standard model
Dirac-Milne
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AT
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Asymétrie AT = 0,0066 ± 0,0013stat ± 0,0010syst!
Les processus microscopiques ne sont pas réversibles
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1.5T
solenoid
DIRC (PID)
144 quartz
bars
11000 PMs
e- (9GeV)
Instrumented Flux Return
iron / RPCs (muon / neutral hadrons)
EMC
6580 CsI(Tl) crystals
e+ (3.1GeV)
Drift Chamber
40 layers
Silicon Vertex Tracker
5 layers, double sided
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• Produire des mésons et
antimésons B mesons
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désintégrations en paires
K! pairs (kaon + pion)
• Même charge pour le
kaon le plus courant que
pour les "électrons" des
atomes de
l'observateur"?
• "Oui" : alors vous êtes
constitués d'antimatière
• Demi-tour !
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