http://www.nature.com/phy…hts/6868-2.html
The experiment picks out B mesons produced when electrons and positrons annihilate. A B meson contains two quarks, one of which is a heavy ‘bottom’ or b quark. When the B-meson decays, the b quark can be transformed into another variety of quark, such as a strange (s) quark. In the decay process studied by the collaboration, the s quark becomes part of a kaon (K), and a pair of oppositely charged leptons (l), which may be electrons or muons, are also produced. This interaction is known as a ‘penguin’ process, as its Feynman diagram can be drawn to resemble a penguin (see illustration).
Nature – Penguin picked up
So now we know..
but what about that elephant?
Very good site. Thanks!!!