hadron

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Hadron

The generic name of a class of particles which interact strongly with one another. Examples of hadrons are protons, neutrons, the &pgr;, K, and D mesons, and their antiparticles. Protons and neutrons, which are the constituents of ordinary nuclei, are members of a hadronic subclass called baryons, as are strange and charmed baryons. Baryons have half-integral spin, obey Fermi-Dirac statistics, and are known as fermions. Mesons, the other subclass of hadrons, have zero or integral spin, obey Bose-Einstein statistics, and are known as bosons. The electric charges of baryons and mesons are either zero or ±1 times the charge on the electron. Masses of the known mesons and baryons cover a wide range, extending from the pi meson, with a mass approximately one-seventh that of the proton, to values of the order of 10 times the proton mass. The spectrum of meson and baryon masses is not understood. See Baryon, Bose-Einstein statistics, Fermi-Dirac statistics, Meson, Neutron, Proton

Based on an enormous body of data, hadrons are now thought to consist of elementary fermion constituents known as quarks which have electric charges of + |e| and |e|, where |e| is the absolute value of the electron charge. For example, a quark-antiquark pair makes up a meson, while three quarks constitute a baryon. See Elementary particle, Quarks

McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.

hadron

(had -ron) See elementary particles. See also Big Bang theory.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

hadron

[′had‚rän]
(particle physics)
An elementary particle which has strong interactions.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
where [a.sub.V] and [a.sub.A] are hadronic structure dependent parts of the radiative corrections for Fermi and Gamow-Teller transitions, respectively.
are recorded at the US Patent and Trademark Office in Washington DC, via notarized documents in the name of Hadronic Press, Inc - 35246 US 19 No.
"Over previous runs we've found significant discrepancies between our data and the most advanced hadronic interaction models, which are used to model how cosmic rays shower down onto the Earth when they interact with our atmosphere," Bonechi said.
Vougiouklis, Hyperstructures and Their Representations", Hadronic Press Inc., Florida, 1994.
In another view, the photon is interpreted as neither a quantum nor a wave but it can be a meson which produces off other hadronic matter and attains physical status.
String theory may be exactly that, a theory, but it has nevertheless strongly influenced thinking in such fields of research as high energy and hadronic physics, gravitation, cosmology, mathematical physics and even condensed matter physics.
Czerwik, Stability of Functional Equations of Ulam-Hyers-Rassias Type, Hadronic Press, Palm Harbor, Florida, 2003.
The argument seems to wander somewhat--Einstein's relativity, Big Bang, Black Holes, Hadronic Mechanics, String Theory--until the magnitude of the topic comes into focus.
Rassias), Hadronic Press, Florida, USA, (1993), 373-448.
An independent test of CKM unitarity comes from W physics at LEP where W decay hadronic branching ratios can be used.
For instance, a mechanism that may be at work and explain the discrepancy is the secondary production at the accelerator: the idea, proposed before AMS data in [159] as a possible explanation to the positron ratio anomaly (see Section 6), is that secondary products of hadronic interactions inside the sources can participate in the acceleration process and subsequently escape into the interstellar medium as an extra component featuring a very flat spectrum.