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Encyclopedia > Exotic hadron
A regular meson made from a quark (q) and antiquark (q-bar) with spins s2 and s1 respectively and having an overall angular momentum L
A regular meson made from a quark (q) and antiquark (q-bar) with spins s2 and s1 respectively and having an overall angular momentum L

Exotic hadrons are subatomic particles made of quarks (and possibly gluons), but which do not fit into the usual schema of hadrons. While bound by the strong interaction they are not predicted by the simple quark model. That is, these exotics do not have the same quark content as ordinary hadrons: exotic baryons have more than just the three quarks of ordinary baryons and exotic mesons do not have one quark and one antiquark like ordinary mesons. These exotics can be searched for by looking for particles with quantum numbers forbidden to ordinary hadrons. Experimental signatures for exotic hadrons have been seen recently but remain a topic of controversy in particle physics. In particle physics, a hadron is a subatomic particle which experiences the strong nuclear force. ... Helium atom (not to scale) Showing two protons (red), two neutrons (green) and a probability cloud (gray) of two electrons (yellow). ... For other uses of this term, see: Quark (disambiguation) 1974 discovery photograph of a possible charmed baryon, now identified as the Σc++ In particle physics, the quarks are subatomic particles thought to be elemental and indivisible. ... In physics, gluons are the bosonic particles which are responsible for the strong nuclear force. ... The strong interaction or strong force is today understood to represent the interactions between quarks and gluons as detailed by the theory of quantum chromodynamics (QCD). ... In physics, the quark model is a classification scheme for hadrons in terms of their valence quarks, ie, the quarks (and antiquarks) which give rise to the quantum numbers of the hadrons. ... In particle physics, a hadron is a subatomic particle which experiences the nuclear force. ... Ordinary baryons are bound states of 3 quarks. ... In particle physics, the baryons are a family of subatomic particles including the proton and the neutron (collectively called nucleons), as well as a number of unstable, heavier particles (called hyperons). ... Identities and classification of possible tetraquark mesons. ... This article is being considered for deletion in accordance with Wikipedias deletion policy. ... Mesons of spin 1 form a nonet In particle physics, a meson is a strongly interacting boson, that is, it is a hadron with integral spin. ... A quantum number is a number used to parametrise certain properties of particles or other systems in quantum mechanics. ... Thousands of particles explode from the collision point of two relativistic (100 GeV per ion) gold ions in the STAR detector of the Relativistic Heavy Ion Collider. ...


History

When the quark model was first postulated by Murray Gell-Mann and others in the 1960's it was to organize the states then in existence in a meanful way. As Quantum Chromodynamics (QCD) developed over the next decade, however, it became apparent that there was no fundamental reason why only 3-quark and quark-antiquark combinations should exist. In addition it seemed that gluons, the force carrying particles of the strong interaction, should also form bound states by themselves (glueballs) and with quarks (hybrid hadrons). Nevertheless, several decades have passed without discovering an exotic hadron. Murray Gell-Mann (born September 15, 1929 in Manhattan, New York City, USA) is an American physicist who received the 1969 Nobel Prize in physics for his work on the theory of elementary particles. ... Quantum chromodynamics (QCD) is the theory of the strong interaction, a fundamental force describing the interactions of the quarks and gluons found in nucleons (such as the proton and neutron). ... Identities and classification of possible tetraquark mesons. ...


Candidates

X(3872) - Discovered by the Belle detector at KEK in Japan, this particle has been variously hypothesized to be diquark or a mesonic molecule. In the field of particle physics Belle Experiment is an international collaboration of more than 400 physicists and engineers investigating CP-violation effects using the Belle particle detector at the High Energy Accelerator Research Organisation (KEK) in Tsukuba, Ibaraki Prefecture, Japan. ... High Energy Accelerator Research Organization (高エネルギー加速器研究機構 Kō Enerugī Kasokuki Kenkyū Kikō), commonly known as KEK, is the high-energy physics research organization in Tsukuba, Ibaraki Prefecture, Japan. ...


Y(3940) - This particle fails to fit into the Charmonium spectrum predicted by theorists. In high energy physics, a charmonium (plural charmonia) is a flavorless meson constituted by a charm quark and an anti-charm quark. ...


Y(4260) - Discovered by the BaBar detector at SLAC in Menlo Park, California this particle is hypothesized to be made up of a gluon bound to a quark and antiquark. The BaBar (B and B-bar) experiment is an international collaboration of more than 550 physicists and engineers investigating CP-violation effects using the BaBar particle detector at the Stanford Linear Accelerator Center, which is operated by Stanford University in California. ... The Stanford Linear Accelerator Center (SLAC) is a U.S. national laboratory operated by Stanford University for the U.S. Department of Energy. ... Menlo Park is the name of some places in the United States of America: Menlo Park, California Menlo Park, New Jersey (See also Menlo. ... Official language(s) English Capital Sacramento Largest city Los Angeles Area  Ranked 3rd  - Total 158,302 sq mi (410,000 km²)  - Width 250 miles (400 km)  - Length 770 miles (1,240 km)  - % water 4. ...


  Results from FactBites:
 
hadron - definition of hadron in Encyclopedia (339 words)
Hadrons are composite particles bound together the color interaction, and thus are somewhat analogous to atoms, in which particles are bound together by the electromagnetic interaction.
Hadrons are further classified by their spin and quark content.
Exotic baryons are composed of more than three quarks (or anti-quarks) odd in number.
  More results at FactBites »

 
 

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