| 单词 | xi particle |
| 释义 | > as lemmasxi particle 3. Particle Physics. Either of a pair of baryons having a mass of approx. 1320 MeV, spin of ½, strangeness of −2, and isospin of ½, which on decaying usually produce a lambda particle and a pion; (also, usually with distinguishing word) any of several related baryons with the same isospin. More fully xi particle. Frequently written Ξ.The two basic xis are composed of two strange quarks and one up or down quark. ΘΚΠ the world > matter > physics > atomic physics > particle physics > particle participating in strong interaction > baryon > [noun] > hyperon > one of pair xi1968 1968 M. S. Livingston Particle Physics xii. 213 The basic octet of states is identified with the nucleon, the Σ-particle triplet, the Λ0 particle, and the Ξ-particle doublet. 2005 Nucl. Physics B. (Proc. Suppl.) 141 81/2 The production cross section for the double charmed Ξ+cc baryon. 2011 K. W. Ford 101 Quantum Questions 161 Other ‘multiplets’ were found, including a triplet of three pions, a doublet of two xi particles, and a singlet lambda particle. < as lemmas |
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