Meson Mes"on, n. [NL., fr. Gr. me`son middle, neut. of me`sos, a., middle.] 1. (Anat.) The mesial plane dividing the body of an animal into similar right and left halves. The line in which it meets the dorsal surface has been called the dorsimeson, and the corresponding ventral edge the ventrimeson. --B. G. Wilder. [1913 Webster]

2. (Physics) An elementary particle made up of two quarks; a hadron having a baryon number of zero; any hadron other than a baryon. Mesons are bosons with integral values of spin, having a mass intermediate between those of the electron and a nucleon; they may have positive or negative charges, or may be neutral. Mesons are of three types: the {pion} ([pi]-meson), {kaon} (K-mesons), and {[eta]-mesons}. [PJC]

{mu meson} (Physics) the former name for the {muon}, a particle which is not a true meson[2]. The term is no longer used in technical literature, except historically. [PJC]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

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  • muon — [ myɔ̃ ] n. m. • 1958; en angl. 1953; méson μ 1937; de mu et (électr)on ♦ Phys. Particule élémentaire à interactions faibles, de même charge (positive ou négative) que l électron. Le muon est un lepton. Adj. MUONIQUE . ● muon nom masculin (de mu… …   Encyclopédie Universelle

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  • muón — muon o muón m. Fís. Partícula elemental inestable del grupo de los leptones, de carga igual a la del electrón. (Símb. μ) …   Diccionario de la lengua española

  • múon — s. m. [Física] Partícula elementar da família dos léptons, com uma carga elétrica positiva ou negativa igual à do eletrão e cuja massa vale 207 vezes a do elétron (símbolo: μ). = MU • [Brasil] Plural: múones ou múons.   ‣ Etimologia: mu +… …   Dicionário da Língua Portuguesa

  • muon — [myo͞o′än΄] n. [ MU + (MES)ON] Particle Physics an unstable, negatively charged lepton with a mass of 105.7 MeV, c. 207 times that of an electron, and a mean lifetime of 2.2×10 6 second: it decays into an electron, a neutrino, and an antineutrino …   English World dictionary

  • Muón — ► sustantivo masculino FÍSICA Partícula elemental, con carga positiva o negativa, cuya masa es de doscientas ocho veces la del electrón. * * * muon m. Colobo (*mono catirrino) de Guinea Ecuatorial. * * * muon o muón. m. Fís. Partícula elemental… …   Enciclopedia Universal

  • muon — muonic, adj. /myooh on/, n. Physics. a lepton similar in most respects to the electron except that it is unstable, it may be positively charged, and its mass is approximately 207 times greater; the positively charged muon is the antiparticle of… …   Universalium

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