# Mixing in the Standard Model

- ## Contributing Diagrams:

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- ## Charm:

  - Q = c, q = u, D0 -D0 mixing
  - q’ = d,s,b
  - important Long Distance (non pert.) terms:

## r = P( D D ) < 10-4

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- ## Beauty:

  - Q =b, q=d,s B0d -B0d , B0s -B0s
  - q’ = u,c,t .
  - t exchange dominates, negligible L.D

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