Which Experiments Proved CP Violation in Particle Decays?

[ryanwilk]

Hi, I'm currently producing an undergraduate poster on CP violation and I have a few questions:

- Was K⁰ -> $$\pi$$⁺+$$\pi$$^- the decay which proved CP violation in the 1964 Fitch/Cronin experiment, or was it oscillations between K⁰ and $$\overline{K}$$⁰, or both? (Answered)

- How were the decays in CERN's NA31/NA48 and Fermilab's KTeV experiments different and what makes them "direct CP violation"?

- Which B meson decays were studied at BaBar and Belle, and in particular, which ones were significant in terms of CP violation?

Any help would be appreciated.
Thanks!

 

[Meir Achuz]

For C&F it was just the observation of K_long (the long lived neutral K)--> 2 pions that violated CP.

 

[ryanwilk]

Ah ok, just to check, were they $$\pi$$⁺$$\pi$$^- or $$\pi$$⁰$$\pi$$⁰?
Looking around the internet, the only articles I can find just say "two pions" or "2$$\pi$$"...

 

[Meir Achuz]

C&F saw only pi+ and pi-.
The two pi0 were harder to see and only were seen several years later.

 

[ryanwilk]

Oh ok, thanks!