kaon
noun
ka·on ˈkā-ˌän 
: an unstable meson that occurs in both charged and neutral forms and is about 970 times more massive than an electron
Example Sentences
Recent Examples on the Web The kaon, a special case of meson particle, is made of one quark and one antiquark. 
Caroline Delbert, Popular Mechanics, 6 Mar. 2020 This symmetry would be all well and good if physicists had not discovered in 1964 that the weak nuclear force doesn’t share it: Two-quark particles called neutral kaons decay in ways CP symmetry forbids. Quanta Magazine, 27 Nov. 2019 Alternatively, the hidden depths of neutron stars might be filled with kaons — also made with strange quarks — that collect into a single lump of matter sharing the same quantum state. Quanta Magazine, 30 Oct. 2017 An experiment in 1964 involving exotic particles called kaons violated charge-parity symmetry. Avery Thompson, Popular Mechanics, 13 Dec. 2017 The Xi decays into a particle called the lambda baryon and three lighter particles, the K- (or kaon) and two pions. Fox News, 11 July 2017 The most famous of these two-quark particles are kaons and pions. Adam Mann, WIRED, 17 June 2013 See More
Caroline Delbert, Popular Mechanics, 6 Mar. 2020 This symmetry would be all well and good if physicists had not discovered in 1964 that the weak nuclear force doesn’t share it: Two-quark particles called neutral kaons decay in ways CP symmetry forbids. Quanta Magazine, 27 Nov. 2019 Alternatively, the hidden depths of neutron stars might be filled with kaons — also made with strange quarks — that collect into a single lump of matter sharing the same quantum state. Quanta Magazine, 30 Oct. 2017 An experiment in 1964 involving exotic particles called kaons violated charge-parity symmetry. Avery Thompson, Popular Mechanics, 13 Dec. 2017 The Xi decays into a particle called the lambda baryon and three lighter particles, the K- (or kaon) and two pions. Fox News, 11 July 2017 The most famous of these two-quark particles are kaons and pions. Adam Mann, WIRED, 17 June 2013 See More Word History
Etymology
International Scientific Vocabulary ka kay (from K-meson, its earlier name) + -on entry 2
First Known Use
1958, in the meaning defined above