| 单词 | top quark |
| 释义 | > as lemmastop quark 42. Particle Physics. A variety of unstable quark, distinguished by a characteristic flavour (flavour n. 5) and having a relatively large mass and an electric charge of +⅔. Also: this flavour (cf. topness n. 2). Frequently as a modifier, esp. and earliest in top quark. Symbol t.Also (now less frequently) called truth. [The names of the top quark and its counterpart the bottom quark (see bottom n. 29) were chosen to reflect the names of the up and down quarks (see up adj. 6 and down n.6) and to begin with letters that had not already been used as symbols in particle physics. Compare truth n. 13 and beauty n. 7, and see the note at the former entry.] ΘΚΠ the world > matter > physics > atomic physics > particle physics > quark > [noun] > differentiating property > top or truth truth1976 top1977 t1978 1975 H. Harari in Physics Lett. B. 57 265/2 (caption) The ordinary u(up), d(down), s(singlet) quarks and the proposed heavy t(top), b(bottom), r(right) quarks. 1984 N.Y. Times 5 July a12/1 [European] laboratory confirms existence of top quark. 2007 Sci. Amer. (U.K. ed.) Mar. 10/2 Such weakly made tops, however, could come without their antitop companion. 2012 S. Carroll Particle at End of Universe iii. 50 Quarks..come in six different flavors: up, down, charm, strange, top, and bottom. < as lemmas |
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