The JPC = 0++ scalar meson nonet and glueball of lowest mass
Abstract
The evidence for the low mass JPC=0++ states is reconsidered. We suggest classifying the isoscalars f0(980) and f0(1500) as members of the 0++ nonet, with a mixing rather similar to that of the pseudoscalars η' and η. The broad state called f0(400-1200) or `sigma'' and the state f0(1370) are considered as different signals from a single broad resonance, which we take to be the lowest-lying 0++ glueball. The main arguments in favor of these hypotheses are presented and compared with theoretical expectations.
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