zweighttp://www.oed.com/dictionary/zweig_n%3Ftab%3Dmeaning_and_useZweig, n.
First published 1993; not fully revised

Zweignoun

Particle Physics.
  1. 1973–
    Used attributively, in combinations, and in the possessive in or with reference to Zweig rule noun (also Zweig's rule) an empirical rule governing the possible outcomes of hadron decay in quantum chromodynamics.
    1. 1973
      A four point function satisfying the quark model ansatz..splits naturally into two three point functions, each satisfying Zweig's rule.
      Physics Rep. vol. 8 199
    2. 1977
      With the Zweig rule, the ρπ decay mode for the physical ϕ meson is permitted only through its admixture of nonet ω state.
      Proceedings 17th Scottish Univ. Summer School Physics 192
    3. 1977
      Examples of..Zweig-allowed and..Zweig-forbidden graphs for ϕ decay.
      Proceedings 17th Scottish Univ. Summer School Physics 192 (caption)
    4. 1978
      There is also a useful review by Lipkin of the empirical status of the so-called Zweig rule, which is supposed to inhibit the decay of the J/ψ to hadrons so strongly.
      Nature 9 March 192/1
    5. 1989
      Any process where new quarks and antiquarks emerge in a way that can be cut, like figure 14.7(b), is suppressed relative to processes of the figure 14.7(a) topology. This observation has been elevated to an ad hoc rule, known as the Zweig rule or OZI rule.
      F. Close in P. Davies, New Physics xiv. 408/1

Zweig, n. was first published in 1993; not fully revised.

Zweig, n. was last modified in March 2025.