| 单词 | upsilon particle |
| 释义 | > as lemmasupsilon particle b. . A meson with a mass of approx. 9.46 GeV that consists of a bottom quark bound to its antiquark. Also more fully upsilon particle. Frequently written Υ. ΘΚΠ the world > matter > physics > atomic physics > particle physics > particle participating in strong interaction > meson > [noun] > type of tau1949 photomeson1950 theta1954 eta1961 omega meson1961 rho1961 phi meson1962 bottomonium1976 quarkonium1977 upsilon1977 1977 S. W. Herb et al. in Physical Rev. Lett. 1 Aug. 255/2 A reasonable designation for this enhancement is Υ(9·5). 1984 New Scientist 16 Aug. 20/1 The researchers were studying the energy region of the upsilon particle—formed from a bottom quark bound with its antiquark. 2012 N. Mee Higgs Force viii. 251 The interpretation of upsilon as a bottom-antibottom pair. < as lemmas |
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