- Eightfold way (physics)
physics, the Eightfold Way is a term coined by American physicist Murray Gell-Mannfor a theory organizing subatomic baryonsand mesons into octets (alluding to the Noble Eightfold Pathof Buddhism). The theory was independently proposed by Israeliphysicist Yuval Ne'emanand led to the subsequent development of the quark model.
In addition to organizing the mesons and spin-1/2 baryons into octets, the principles of the Eightfold Way also applied to the spin-3/2 baryons, forming a decuplet. However, one of the particles of this decuplet had never been previously observed. Gell-Mann called this particle the SubatomicParticle|link=yes|Omega- and predicted in
1962that it would have a strangeness−3, electric charge−1 and a mass near val|1680|u=MeV/c2. In 1964a particle closely matching these predictions was discovered by a particle accelerator group at Brookhaven, making the Eightfold Way a triumphant success. Gell-Mann went on to receive the 1969 Nobel Prize in physicsfor his work on the theory of elementary particles.
The Eightfold Way may be understood in modern terms as a consequence of flavor symmetries between various kinds of
quarks. Since the strong nuclear forceis the same for quarks of any flavor, replacing one flavor of quark with another in a hadron should not alter its mass very much. Mathematically, this replacement may be described by elements of the group SU(3). The octets and other arrangements are representations of this group; for a more detailed explanation of this fact, see the article Particle physics and representation theory.
*cite book|last=Griffiths|first=David|year=1987|title=Introduction to Elementary Particles|location=New York|publisher=John Wiley & Sons|id=ISBN 0-471-60386-4
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