hyperon

/huy"peuh ron'/, n. Physics.
any baryon with strangeness other than zero, esp. one with a relatively long lifetime.
[1950-55; HYPER- + -ON1]

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      quasi-stable member of a class of subatomic particles (subatomic particle) known as baryons (baryon) that are composed of three quarks (quark). More massive than their more-familiar baryon cousins, the nucleons (nucleon) (protons (proton) and neutrons (neutron)), hyperons are distinct from them in that they contain one or more strange quarks. Hyperons, in order of increasing mass, include the lambda-zero (Λ0) particle, a triplet of sigma (Σ) particles, a doublet of xi (Ξ) particles, and the omega-minus (Ω) particle. Each of the seven particles, detected during the period 1947–64, also has a corresponding antiparticle. The discovery of the omega-minus hyperon was suggested by the Eightfold Way of classifying hadrons (hadron), the more-general group of subatomic particles to which hyperons are assigned. Hadrons are composed of quarks and interact with one another via the strong force.

      Hyperons are produced by the strong force in the time it takes for a particle traveling at nearly the speed of light to cross the diameter of a subatomic particle, but their decay by the weak force (which is involved in radioactive (radioactivity) decay) takes millions of millions of times longer. Because of this behaviour, hyperons—along with K-mesons (meson), with which they are often produced—were named strange particles. This behaviour has since been ascribed to the weak decays of the specific quarks—also called strange—that they contain.

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Universalium. 2010.

Look at other dictionaries:

  • hypéron — [ iperɔ̃ ] n. m. • 1953; de hyper et (électr)on ♦ Phys. nucl. Baryon de masse supérieure à celle du nucléon, à durée de vie très courte. ● hypéron nom masculin (de électron) Nom parfois donné aux baryons d étrangeté non nulle. hypéron n. m. PHYS… …   Encyclopédie Universelle

  • hyperon — n. (Physics) Any baryon that is not a nucleon; it is an unstable particle with a mass greater than that of a neutron. [WordNet 1.5] …   The Collaborative International Dictionary of English

  • Hyperon — Hypéron Les hypérons sont des particules de type baryon composés d au moins un quark s, qui ressemblent aux nucléons lourds. Les hypérons sont tous des fermions et ont une masse plus ou moins importante et donc ils sont instables et ils se… …   Wikipédia en Français

  • hyperon — [hī′pər än΄] n. [ HYPER + (BARY)ON] Particle Physics an unstable baryon that is more massive than a neutron …   English World dictionary

  • Hyperon — Als Hyperon wird ein Baryon bezeichnet, das mindestens ein Strange Quark (s Quark), aber kein schweres Quark (also Charm Quark oder Bottom Quark) als Valenzquark enthält. Hyperonen wurden erstmals in den 1950er Jahren nachgewiesen. Das SU(3)… …   Deutsch Wikipedia

  • Hyperon — In particle physics, a hyperon is any baryon containing a strange quark, but no charm quarks or bottom quarks.Properties and behavior of hyperonsBeing baryons, all hyperons are fermions. That is, they have half integer spin and obey Fermi Dirac… …   Wikipedia

  • Hyperon — hiperonas statusas T sritis fizika atitikmenys: angl. hyperon vok. Hyperon, n rus. гиперон, m pranc. hypéron, m …   Fizikos terminų žodynas

  • Hyperon — Hy|pe|ron [↑ hyper u. ↑ on (3)], das; s, …ro|nen: sehr kurzlebige Elementarteilchen (↑ Baryonen) mit Strangeness, deren Masse die der Nukleonen übersteigt. Man unterscheidet Lambda , Sigma , Xi u. Omega Hyperonen (Λ, Σ, Ξ, Ω). * * * Hy|pe|ron,… …   Universal-Lexikon

  • Hypéron — Les hypérons sont des particules de type baryon composés d au moins un quark s, qui ressemblent aux nucléons lourds. Les hypérons sont tous des fermions et ont une masse plus ou moins importante et donc ils sont instables et ils se désintègrent… …   Wikipédia en Français

  • Hyperon — Hy|pe|ron das; s, ...onen unter Einfluss von engl. hyperon zu ↑hyper... u. 4↑...on> Elementarteilchen, dessen Masse größer ist als die eines ↑Nukleons (Phys.) …   Das große Fremdwörterbuch

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