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The Collaborative International Dictionary
muon

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.

  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.

    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.

Wiktionary
muon

n. An unstable elementary particle in the lepton family, having similar properties to the electron but with a mass 209 times greater.

WordNet
muon

n. an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino [syn: negative muon, mu-meson]

Wikipedia
Muon

The muon (; from the Greek letter mu (μ) used to represent it) is an elementary particle similar to the electron, with an electric charge of −1 e and a spin of , but with a much greater mass. It is classified as a lepton. As is the case with other leptons, the muon is not believed to have any sub-structure—that is, it is not thought to be composed of any simpler particles.

The muon is an unstable subatomic particle with a mean lifetime of . Among all known unstable subatomic particles, only the neutron (lasting around 15 minutes) has a longer decay lifetime; others decay significantly faster. Muon decay is mediated by the weak interaction exclusively, as is neutron decay. Muon decay always produces at least three particles, which must include an electron of the same charge as the muon and two neutrinos of different types.

Like all elementary particles, the muon has a corresponding antiparticle of opposite charge (+1 e) but equal mass and spin: the antimuon (also called a positive muon). Muons are denoted by and antimuons by . Muons were previously called mu mesons, but are not classified as mesons by modern particle physicists (see ), and that name is no longer used by the physics community.

Muons have a mass of , which is about 207 times that of the electron. Due to their greater mass, muons are not as sharply accelerated when they encounter electromagnetic fields, and do not emit as much bremsstrahlung (deceleration radiation). This allows muons of a given energy to penetrate far more deeply into matter than electrons since the deceleration of electrons and muons is primarily due to energy loss by the bremsstrahlung mechanism. As an example, so-called "secondary muons", generated by cosmic rays hitting the atmosphere, can penetrate to the Earth's surface, and even into deep mines.

Because muons have a very large mass and energy compared with the decay energy of radioactivity, they are never produced by radioactive decay. They are, however, produced in copious amounts in high-energy interactions in normal matter, in certain particle accelerator experiments with hadrons, or naturally in cosmic ray interactions with matter. These interactions usually produce pi mesons initially, which most often decay to muons.

As with the case of the other charged leptons, the muon has an associated muon neutrino, denoted by , which is not the same particle as the electron neutrino, and does not participate in the same nuclear reactions.

Muon (band)

MUON is a post-rock and electronica band from Singapore that originally began in 1999 as a solo project by founding member, Nick Chan. The band is influenced by genres such as IDM, ambient, trip hop and drum and bass, and artists such as DJ Shadow, Aphex Twin and The Cinematic Orchestra.

Nick released two albums on his own, 'The Death of Cinema' (2003) and 'In Flught' (2004) before recruiting drummer Edwin Leong in 2005. MUON's latest formation now comprises Nick together with Jordan Chia, Adam Shah and Ren Wong.

The band has performed extensively at gigs and festivals including venues Zouk and 3some in Bangkok, Baybeats Festival at The Esplanade, Enroute Festival, Dual City Sessions, PlusMinusTen, Syndicate Subsessions, Musicity Singapore and Fred Perry 60th Anniversary.

MUON recently released its critically acclaimed fourth studio album, 'The Shape of Shapes to Come' (2012) on its bandcamp.

Usage examples of "muon".

But if these muons are not sitting at rest in the laboratory and instead are traveling through a piece of equipment known as a particle accelerator that boosts them to just shy of light-speed, their average life expectancy as measured by scientists in the laboratory increases dramatically.

Beyond the frame in that place he could see men and women working with photons, quarks and muons to create the supplies the shoppe used as stock.

Because at last we had a nondestructive means of scanning the exact state of muons through infinitesimal passages of time, we were able to find some astonishing correlations between memory and the barely detectable muon states of slant and yaw.

And when a proton annihilates an antiproton, it produces a pi-zero meson one-third of the time, and a charged pion, a muon, and a neutrino two-thirds of the time, after which the pions and neutrons promptly break down to electrons and positrons, photons and neutrinos.

This slowing of time applies not just to the watches worn by the muons but also to all activities they might undertake.

Nuclear particles, known as mu mesons or muons, are continually falling onto the surface of Earth.

More dramatically, the different but equally valid muon perspectives seem to lead us to the conclusion that each group will claim that it is the other group that dies first.

He could try other more energetic transmissions, bursts of positrons, muons, gamma rays, or antiprotons that might attract attention to the Bridgehead.

To read even an elementary guide to particle physics nowadays you must now find your way through lexical thickets such as this: “The charged pion and antipion decay respectively into a muon plus antineutrino and an antimuon plus neutrino with an average lifetime of 2.

It's a big barrel-shaped superconducting solenoid coil with elaborate wire chambers on the inside and layers of calorimeters and muon detectors on the outside.

An electron neutrino, the most common sort, can be changed into either a muon or a tauon neutrino.

I tried doing some reading in the area--muon decay of the ``forbidden'' kind: gamma decay that doesn't include the muon neutrino among its products--but nothing I encountered, not even the latest readings from the Swiss Institute for Nuclear Research near Zurich, gave me an insight.

I tried doing some reading in the area-muon decay of the forbidden kind: gamma decay that doesnt include the muon neutrino among its products-but nothing I encountered, not even the latest readings from the Swiss Institute for Nuclear Research near Zurich, gave me an insight.

I tried doing some reading in the area--muon decay of the forbidden kind: gamma decay that doesnt include the muon neutrino among its products--but nothing I encountered, not even the latest readings from the Swiss Institute for Nuclear Research near Zurich, gave me an insight.

The fact that the bosons were generating muons had become common knowledge and it had created a real hysteria, exceeding, if possible, the hysterias about the use of nuclear weapons.