Summary
We study a relativisticSU 6 symmetry model based on the groupSL 6.c . It uses infinite-dimensional, unitary representations of this group as they are known from the theory of Gel’fand and Neumark. We construct the states for mesons and baryons and compute the integral kernel which enables us to couple meson and baryon representations to an invariant vertex. There are no troubles with the unitarity of theS-matrix in this model.
Riassunto
Si studia un modello relativistico di simmetriaSU 6 basato sul gruppoSL 6.c . Si usano di questo gruppo rappresentazioni unitarie ad infinite dimensioni, quali sono conosciute dalla teoria di Gel’fand e Neumark. Si costruiscono gli stati per i mesoni e i barioni e si calcola il nocciolo integrale che permette di accoppiare rappresentazioni di mesoni e barioni ad un vertice invariante. In questo modello non si hanno difficoltà con l’unitarietà della matriceS.
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References
W. Rühl:Nuovo Cimento,43 A, 171 (1966).
W. Rühl: CERN Preprint TH 626 (1965).
P. Budini andC. Fronsdal:Phys. Rev. Lett.,14, 968 (1965).
C. Fronsdal: Trieste preprint IC/65/68 (1965).
J. M. Gel’fand andM. A. Neumark:Unitäre Darstellungen der klassischen Gruppen (Berlin, 1957). Their theory will be referred to as G.-N. theory.
See,e.g.,W. Rühl:The SL 6.C model as a relativistically invariant formulation of SU 6 symmetry, inSeminar on High-Energy Physics and Elementary Particles, Trieste (1965), to be published, and the literature quoted in this paper.
We feed obliged to quote here an unpublished work ofJ. Wess andB. Zumino, who studied a similar model under analogous assumptions. They were the first to find the nonlocal structure of this type of models.
A. O. Barut:Phys. Rev.,135, B 839 (1964). Later on this idea was popularized particularly byC. Fronsdal andM. Gell-Mann.
F. Gürsey andL. A. Radicati:Phys. Rev. Lett.,13, 173 (1964).
We shall use this notation throughout. The starting multiplet is the smallest representation of the maximally compact subgroup contained in the unitary representation ofSL 6.C. It is uniquely determined by the parametersm k.
The notations «maximally degenerate representation» and «tower representations» are probably equivalent.
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Part of this work was done during a stay at the Joint Institute for Nuclear Research, Dubna.
Traduzione a cura della Redazione.
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Rühl, W. A relativistically invariant model ofSU 6 symmetry which involves infinite representations of the internal symmetry group. Nuovo Cimento A (1965-1970) 44, 572–597 (1966). https://doi.org/10.1007/BF02911188
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DOI: https://doi.org/10.1007/BF02911188