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MESON [5 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2016-03-07

English

Subject field(s)
  • Atomic Physics
CONT

The new particle has a mass of about 3.1 billion electron volts (3.1 GeV). That is more than three times the mass of the proton, making the psi one of the heaviest particles known ... The psi has a spin angular momentum of 1, the integer unit indicating the particle must be a meson. It is electrically neutral, and it has zero strangeness. ... The psi particle also decays through the strong interaction, but it has a lifetime of about [ten to the minus twentieth of a] second, 1,000 times longer than the lifetime of a typical hadron of comparable mass.

OBS

The new particle was discovered independently and at about the same time by two groups of experimenters ... One group, whose members were from the Massachusetts Institute of Technology and the Brookhaven National Laboratory ... gave it the name J. The other group ... made up of physicists from the Stanford Linear Accelerator Center (SLAC) and the Lawrence Berkeley Laboratory ...[designated] the particle by the Greek letter psi ...

OBS

The word "psi" must be replaced by the corresponding Greek letter or italicized.

French

Domaine(s)
  • Physique atomique
CONT

La durée de vie de la particule [psi] (3105) est grande par rapport aux désintégrations fortes usuelles; or, étant donné sa masse élevée, le nombre d'états finals énergétiquement possibles (plusieurs mésons [pi] par exemple) est grand [...]

OBS

Il se trouve parfois que le terme «psi» tout seul est employé pour désigner cette particule; il s'emploie plus souvent pour désigner la «famille» de particules à laquelle elle appartient.

OBS

Le mot «psi» doit être remplacé par la lettre grecque correspondante ou être écrit en italique.

Spanish

Save record 1

Record 2 2015-02-13

English

Subject field(s)
  • Atomic Physics
DEF

An elementary particle; the contraction of pi-meson. The mass of a charged pion is about 273 times that of an electron. An electrically neutral pion has a mass 264 times that of an electron.

French

Domaine(s)
  • Physique atomique
CONT

Les mésons se divisent en deux groupes : les mésons pi, dont la masse est environ 270 fois celle de l'électron, et les mésons ka, [...]

Spanish

Campo(s) temático(s)
  • Física atómica
DEF

Partícula elemental inestable del género de los mesones. Su masa es aproximadamente 270 veces la del electrón y su carga eléctrica es igual a la de este o nula.

Save record 2

Record 3 2001-01-31

English

Subject field(s)
  • Atomic Physics
  • Radiological Physics (Theory and Application)
  • Theoretical Astronomy
DEF

Short-lived elementary particles with masses between that of the electron and that of the proton; for example, mu-mesons (muons); pi-mesons (pions); and K-particles.

French

Domaine(s)
  • Physique atomique
  • Physique radiologique et applications
  • Astronomie théorique
DEF

Particule élémentaire, chargée ou non, de la classe des bosons, de vie très courte, de spin nul, dont la masse est intermédiaire entre celle de l'électron et celle du proton, et qui apparaît dans les réactions nucléaires de grande énergie.

Spanish

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Record 4 1995-07-05

English

Subject field(s)
  • Atomic Physics
DEF

Collective name for four pseudo-scalar mesons, having masses of about 495 MeV ... and decaying via weak interactions....

CONT

Such high-energy cosmic ray collisions produce a shower of secondary particles, principally kaons (K mesons) and pions (pi-mesons), which in turn decay spontaneously into muons. [Sci. Amer. Oct. 42/3].

CONT

... the superheated plasma will give rise to many more s quarks and antiquarks ... [that] will eventually decay, but the processes responsible for their decay are relatively slow, and many of them will escape the fireball. They will escape inside particles such as K mesons and lambda particles, which experimenters are eminently equipped to observe.

French

Domaine(s)
  • Physique atomique
DEF

Méson neutre ou chargé d'étrangeté non nulle [...] c'est une particule étrange, qui ne peut être produite qu'en paire kaon-antikaon, ou associée avec un hypéron. C'est un méson lourd; sa masse est, en effet, environ quatre fois plus élevée que celle du méson pi.

Spanish

Save record 4

Record 5 1986-12-12

English

Subject field(s)
  • Organizations, Administrative Units and Committees
  • Atomic Physics
Key term(s)
  • Tri U.M.F.

French

Domaine(s)
  • Organismes, unités administratives et comités
  • Physique atomique

Spanish

Save record 5

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