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CP Violation and Mixing: The Quest for Understanding Mass Eigenstates

Discover the intricacies of CP violation in decay amplitudes and the distinction between CP and mass eigenstates. Explore the firm establishment of direct CP violation after 30 years and the favored CKM model for CP violation. Delve into discussions on CPV at BES, D0-D0 mixing, and interference effects. Unravel the potential impact of fourth-generation contributions and the implications of doubly-Cabibbo suppressed decays on understanding CP violation in various contexts.

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CP Violation and Mixing: The Quest for Understanding Mass Eigenstates

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  1. MIXING or INDIRECT DIRECT CP violation in the decay amplitute CP eigenstates ≠ mass eigenstates INTERFERENCE CP violation from interference of “DIRECT and MIXING” DIRECT CP firmly established after more than 30 years Re(e’/e) = (16.7±2.3)x10-4 Kaon and CP: classification eK Re(e’/e)

  2. CKM Model is our Favored Model for CPV

  3. 5. Discussions and ConclusionsCPV at BESMixing and CP Violation in D0-D0 BES also can produce D0 and D0 from y(3770) decays, can also study D0-D0 mixing. K-K, B-B and Bs-Bs mixing observed, in principle Should have D-D mixing. Short distance contribution small: x = Dm/G ~ y=DG/2G ~ 6x10^(-7) (Golowich and Petrov, PLB625,53(2005)

  4. Long distance dominated.(Petrov, hep-ph/0311371)Babu, He, Li and Pakvasa, PLB202, 540(1988)fourth generation can have large contribution to x.

  5. If the ratio of doubly-Cabibbo suppressed decay to the normal decay R_D is measured, one can get information about x’ and y’.If produces D0 and D0 from y(3770), one of them can be used to tag the flavor.

  6. CP Violation in J/y -> LL CP Violating observable in J/y -> LL (He, Ma &McKellar, PRD47, 1744(1993), PRD49, 4548(1994).)

  7. With 5.8x10^7 J/y can already improve the current bound on dL

  8. Back ups

  9. CP violation in hyperon non-leptonic pion decaysPRL93, 262001(2005)[hep-ex/0412038](Theoretical studies: Donohuge, He and Pakvasa, Tandean and Valencia)

  10. CP violation from Cosmology Our universe has more matter than anti-matter. Why such an asymmetric universe?

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