Chronology of Milestone Events in Particle Physics - GÜRSEY 1964
Chronology of Milestone Events in Particle Physics

GÜRSEY 1964

Gürsey, F.; Radicati, L.A.;
Spin and Unitary Spin Independence of Strong Interactions
Phys. Rev. Lett. 13 (1964) 173;

Motivation
The purpose of this Letter is twofold. We want first to point out that the group SU(4) introduced by Wigner (E. P. Wigner, Phys.Rev. 51 (1937) 105) to classify nuclear states can be extended to relativistic domain and it is, therefore, relevant for particle physics. We will next show that when strangeness is taken into account the group SU(4) becomes enlarged to SU(6) which contains, as a subgroup, SU(3) x [SU(2)]q. [SU(2)]q is the unitary subgroup (little group) of the Lorentz group that leaves invariant the momentum four-vector q.
The group we consider here embodies SU(3) and the ordinary spin in the same way as Wigner's SU(4) embodies isotopic spin and ordinary spin. Preliminary results on the classification of particles based on SU(6) seem encouraging enough to motivate study of this group. (Extracted from introductory part of the paper.).

Related references
See also
P. Franzini and L. A. Radicati, Phys. Lett. 6 (1963) 322;
Y. Nambu and P. G. O. Freund, Phys. Rev. Lett. 12 (1964) 714;
F. Gürsey, T. D. Lee, and M. Nauenberg, Phys. Rev. 135 (1964) B467;
A. Pais, Phys. Rev. Lett. 13 (1964) 175;

Record comments
Introduction of the SU(6) classification of hadrons.
    
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