Scientists at Fermilab have found that certain B mesons transition between a matter and antimatter states 3 trillion times per second. A B sub S meson consists of a bottom quark and strange antiquark. The meson transitions between a matter state and an antimatter state. The frequency of 3 trillion times per second agreed with the current standard model.
http://physicsweb.org/articles/news/10/4/6/1
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