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Any of a group of four mesons, one positively charged and one negatively charged, having a mass 966 times that of an electron, and two electrically neutral, having a mass 974 times that of an electron. The two charged kaons have the same mean lifetime, about 1.24 × 10-10 second; the two neutral kaons have lifetimes of about 9 × 10-11 second and 5 × 10-8 second. Also called K meson.

[ka, pronunciation of the letter K + -on.]


(General Physics) a meson that has a positive or negative charge and a rest mass of about 966 electron masses, or no charge and a rest mass of 974 electron masses. Also called: K-meson
[C20: ka representing the letter k + (mes)on]


(ˈkeɪ ɒn)

a meson with strangeness + 1 and either positive or zero electric charge, or its antiparticle with strangeness −1 and either negative or zero electric charge.
Symbol: K Also called K meson.
[1955–60; ka- (sp. of name of letter k) + (mes) on]
ka•on′ic, adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.kaon - an unstable meson produced as the result of a high-energy particle collision
meson, mesotron - an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0
References in periodicals archive ?
Violation of the CP symmetry was first observed at Brookhaven Laboratory in the US in the 1960s in neutral particles called kaons.
The mesons, which include the pions, the kaons, the rhos, the Ds, the etas, and many others, have masses ranging from.
In 1972, Kobayashi and Maskawa explained why an experiment eight yearsbefore had found that some subatomic particles called kaons failed to followthe rules of symmetry.
Two state systems in QM: applications to neutrino oscillations and neutral kaons.
CP-violation (CPV) (1) has been seen in the mixing of the neutral kaons, and recently also in the K[degrees] [right arrow] 2[pi] amplitudes [2] and in the decays of the neutral B-mesons [3].
The only such mechanism known to science is called CP-violation, first observed in 1964 in a group of particles called Kaons.
It is not unknown among fundamental particles; quarks and particles called kaons do it too.
The LHCb Collaboration was looking at decays of particles called D-mesons, which contain what are known as charmed-quarks, which can in turn decay into kaons and pions.
Direct observation of CP violation in neutral kaons, suggesting not all particles and their antiparticles behave symmetrically