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The Origin of the Matter-Antimatter Asymmetry:

The Origin of the Matter-Antimatter Asymmetry:. Will we ever know?. Michael Dine SLAC Conference on Heavy Flavor Physics at High Luminosity e+e- Colliders May, 2003. The Asymmetry. From Nucleosynthesis: W B h 2 = 0.0214 § 0.002 From CMBR:

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The Origin of the Matter-Antimatter Asymmetry:

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  1. The Origin of the Matter-Antimatter Asymmetry: Will we ever know? Michael Dine SLAC Conference on Heavy Flavor Physics at High Luminosity e+e- Colliders May, 2003

  2. The Asymmetry • From Nucleosynthesis: • WB h2 = 0.0214§ 0.002 • From CMBR: • WBh2 = 0.0224§ 0.0009

  3. Sakharov Conditons • Violation of Baryon Number at the level of the fundamental laws • An Arrow of Time • CP Violation

  4. e+ e+ u XX u d^c po d

  5. X X

  6. MW=0 MW=gf

  7. [Cline,Joyce and Kainulainen, 1998]

  8. h N N l l

  9. VV f f

  10. Scalar in condensate

  11. PROSPECTSCosmology and Microphysics • Nucleosynthesis: we can calculate the dark matter density from our knowledge of microphysics. • Dark Matter: We might calculate the dark matter density in the future if supersymmetry is discovered, and the properties of superparticles measured (esp. masses – linear collider); or if we discover axions. Both scenarios require (plausible) assumptions about the early universe. • Inflation: probably requires theoretical as well as observational input (string theory?).

  12. Baryogenesis: we have narrowed the possibilities, but: • With neutrino mass, we may have encountered a basic clue to the origin of the matter-antimatter asymmetry. Measurements plus theoretical developments will be necessary to a calculation of the asymmetry. • Discovery of supersymmetry would open up new possibilities (coherent production, electroweak baryogenesis). But theory as well as experiment will be necessary. • In either case, further theoretical progress will surely require more theoretical input on the questions of flavor and CP violation.

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