单词	pion
释义	pion noun pi·​on ˈpī-ˌän  : a meson that is a combination of up and down quarks and antiquarks, that may be positive, negative, or neutral, and that has a mass about 270 times that of the electron pionic pī-ˈä-nik  adjective Example Sentences Recent Examples on the Web When a very fast pion crashes into a hydrogen atom, the energy held within this force is released all at once, similar to a snapping rubber band. Elizabeth Fernandez, Forbes, 19 Sep. 2021 In 2019, Alberg and Miller calculated what SeaQuest should observe based on the pion cloud idea. Quanta Magazine, 24 Feb. 2021 An early triumph in which Chew’s students used the bootstrap to predict the mass of the rho meson — a particle made of pions that are held together by exchanging rho mesons — won many converts. Quanta Magazine, 23 Feb. 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 Word History Etymology contraction of pi-meson First Known Use 1950, in the meaning defined above
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