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New stable meson has fifth quark flavor

APR 01, 1983

Although the list of known mesons is long, the few that are stable against hadronic and electromagnetic decay form a rather exclusive club. Until recently, the catalogue of mesons stable against all but weak decay included only the π+, K+, K0, D+, D0, F+ and their antiparticles. The stability of these particles attests to the conservation of their various quark flavors (up, down, strange and charmed). Only the weak interaction can transmute a quark of one flavor to another.

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This Content Appeared In
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Volume 36, Number 4

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