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单词 K Meson
释义

K Meson

英语百科

Kaon

 The decay of a kaon (K+) into three pions (2 π+, 1 π−) is a process that involves both weak and strong interactions.Weak interactions : The strange antiquark (s) of the kaon transmutes into an up antiquark (u) by the emission of a W+ boson; the W+ boson subsequently decays into a down antiquark (d) and an up quark (u).Strong interactions : An up quark (u) emits a gluon (g) which decays into a down quark (d) and a down antiquark (d).
Two different neutral K mesons, carrying different strangeness, can turn from one into another through the weak interactions, since these interactions do not conserve strangeness. The strange quark in the anti-K0 turns into a down quark by successively absorbing two W-bosons of opposite charge. The down antiquark in the anti-K0 turns into a strange antiquark by emitting them.

In particle physics, a kaon /ˈk.ɒn/, also called a K meson and denoted K, is any of a group of four mesons distinguished by a quantum number called strangeness. In the quark model they are understood to be bound states of a strange quark (or antiquark) and an up or down antiquark (or quark).

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更新时间:2025/6/21 13:24:38