meson - определение. Что такое meson
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Что (кто) такое meson - определение

SUBATOMIC PARTICLE; HADRON MADE OF EQUAL NUMBER OF QUARK(S) AND ANTIQUARK(S): NORMALLY ONE OF EACH
Mesons; Antimeson; Mesotron; Bottom meson; Mesonics; Meson physics
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Meson         
·noun 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.
meson         
['mi:z?n, 'm?z?n]
¦ noun Physics a subatomic particle, intermediate in mass between an electron and a proton, that transmits the strong interaction binding nucleons together.
Derivatives
mesonic m?'z?n?k adjective
Origin
1930s: from meso- + -on.
Anne Meson         
FRENCH SINGER
ANNE MESON
Anne Meson (born 12 May 1975) is a French show host and singer. Her mother Anne was a Russian artist and a dance teacher.

Википедия

Meson

In particle physics, a meson () is a type of hadronic subatomic particle composed of an equal number of quarks and antiquarks, usually one of each, bound together by the strong interaction. Because mesons are composed of quark subparticles, they have a meaningful physical size, a diameter of roughly one femtometre (10−15 m), which is about 0.6 times the size of a proton or neutron. All mesons are unstable, with the longest-lived lasting for only a few tens of a nanosecond. Heavier mesons decay to lighter mesons and ultimately to stable electrons, neutrinos and photons.

Outside the nucleus, mesons appear in nature only as short-lived products of very high-energy collisions between particles made of quarks, such as cosmic rays (high-energy protons and neutrons) and baryonic matter. Mesons are routinely produced artificially in cyclotrons or other particle accelerators in the collisions of protons, antiprotons, or other particles.

Higher-energy (more massive) mesons were created momentarily in the Big Bang, but are not thought to play a role in nature today. However, such heavy mesons are regularly created in particle accelerator experiments that explore the nature of the heavier quarks that compose the heavier mesons.

Mesons are part of the hadron particle family, which are defined simply as particles composed of two or more quarks. The other members of the hadron family are the baryons: subatomic particles composed of odd numbers of valence quarks (at least 3), and some experiments show evidence of exotic mesons, which do not have the conventional valence quark content of two quarks (one quark and one antiquark), but 4 or more.

Because quarks have a spin 1/2, the difference in quark number between mesons and baryons results in conventional two-quark mesons being bosons, whereas baryons are fermions.

Each type of meson has a corresponding antiparticle (antimeson) in which quarks are replaced by their corresponding antiquarks and vice versa. For example, a positive pion (
π+
) is made of one up quark and one down antiquark; and its corresponding antiparticle, the negative pion (
π
), is made of one up antiquark and one down quark.

Because mesons are composed of quarks, they participate in both the weak interaction and strong interaction. Mesons with net electric charge also participate in the electromagnetic interaction. Mesons are classified according to their quark content, total angular momentum, parity and various other properties, such as C-parity and G-parity. Although no meson is stable, those of lower mass are nonetheless more stable than the more massive, and hence are easier to observe and study in particle accelerators or in cosmic ray experiments. The lightest group of mesons is less massive than the lightest group of baryons, meaning that they are more easily produced in experiments, and thus exhibit certain higher-energy phenomena more readily than do baryons. But mesons can be quite massive: for example, the J/Psi meson (
J/ψ
) containing the charm quark, first seen 1974, is about three times as massive as a proton, and the upsilon meson (
ϒ
) containing the bottom quark, first seen in 1977, is about ten times as massive.

Примеры употребления для meson
1. And my BlackBerry, God help me." Contacts Meson Bilbao, 33 Malvern Road, London, (+44 871) 332 7024.
2. I think I‘ve had the most fun most often at our dacha, so long as my musical Russian friend brings his guitar and nobody has stolen our barbecue." Favorite restaurant worldwide "Meson Bilbao, a little–known (fortunately) Spanish place close to where I used to live in London.
3. Advertisement They coauthored several scientific articles, with titles such as "On convergence of the ChPT HFF expansion for one loop contribution to meson production in NN collisions" and "A Chiral Effective Field Theory and Radiative Decays of Mesons." "Eduard was one of the greatest physicists I had the honor of working with," said a colleague at the BGU physics department, Prof.