weak interaction

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weak interaction

1. One of the four fundamental interactions of nature, mediated by the intermediate vector bosons and acting on leptons and quarks. It is responsible for the decay of many hadrons, for the beta decay of nuclei, and for the interactions of neutrinos. The weak interaction is weaker than the strong and electromagnetic interactions, but stronger than the gravitational interaction.
2. An instance of this interaction.

weak interaction


weak force

(General Physics) physics an interaction between elementary particles that is responsible for certain decay processes, operates at distances less than about 10–15 metres, and is 1012 times weaker than the strong interaction. The weak interaction and electromagnetic interactions are now described by the unifying electroweak theory. Also called: weak nuclear interaction or weak nuclear force See interaction2, electroweak interaction

weak′ interac′tion

the interaction between elementary particles and the three intermediate vector bosons that carry the weak force.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.weak interaction - (physics) an interaction between elementary particles involving neutrinos or antineutrinos that is responsible for certain kinds of radioactive decay; mediated by intermediate vector bosons
natural philosophy, physics - the science of matter and energy and their interactions; "his favorite subject was physics"
fundamental interaction, interaction - (physics) the transfer of energy between elementary particles or between an elementary particle and a field or between fields; mediated by gauge bosons
References in periodicals archive ?
In another class of experiments, a T-odd operator is constructed out of final state observables in a decay process, such as the weak decay [K.sup.+] [right arrow] [[pi].sup.0][[mu].sup.+] v studied by the KEK-E246 experiment [24] in which the muon polarization transverse to the decay plane ([P.sub.T] = [P.sub.K] x ([p.sub.[pi]] x [p.sub.[mu]])/[absolute value of ([p.sub.[pi]] x [p.sub.[mu]])]) was determined as an Observable whose nonzero mean value would manifest T violation.
Despite decades of detailed experimental studies of neutron beta-decay, this rare branch of a fundamental weak decay has never been observed.
The [B.sup.*] decay occurs mainly through the electromagnetic process [[bar.B].sup.*] [right arrow] [bar.B][gamma], and the weak decay modes are very rare.
However, for neutron decay, the difficulty arises from relatively weak decay source ([10.sup.3] - [10.sup.4] [s.sup.-1]).
For an excited neutrinos, three decay modes are possible: radiative decay [v.sup.*] [right arrow] v[gamma], neutral weak decay [v.sup.*] [right arrow] vZ, and charged weak decay [v.sup.*] [right arrow] e[W.sup.+].