MadSci Network: Physics

Re: They have found a CP violation?, whats to happen to the standard model?

Date: Mon May 22 17:34:48 2000
Posted By: Benn Tannenbaum, Post-doc/Fellow, Physics and Astronomy, University of California, Los Angeles
Area of science: Physics
ID: 958482591.Ph

CP violation was first observed by Cronin and Fitch in 1964, by examining
the number of k_Long and k_short after all the K_short should have decayed
aways. They found 45 k_short out of 22,700 total decays. Clear evidence of
CP violation! For this they received the Nobel Prize in 1980.

The Standard Model doesn't have much to say about CP violation-- in fact,
CP violation is so far the only reason we have for being in a matter (as
opposed to anti-matter) dominated universe. We are still trying to measure
how much CP is violated, by measuring the angles beta and alpha. 

I got this information from Griffith's excellent text "Introduction to
Elementary Particles" (1987) but it is unfortunately dated.  

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