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π0′ is the hitherto undiscovered (0-) particle withJ = 0, S= 0. In addition it is also possible to have one more Bose singlet (I= 0) of spin one [B Bfor example in Sakurai’s notation (J. J. Sakurai:Ann. of Phys.,11, 1 (1960)] if the U(3) rather than the SU(3) group is used.
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Salam, A. Some consequences of the unitary simmetry. Nuovo Cim 23, 455–457 (1962). https://doi.org/10.1007/BF02785725
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DOI: https://doi.org/10.1007/BF02785725