Is the σ(600) a Glueball? Two photon reactions can tell us
classification
✦ hep-ph
keywords
glueballphotonsigmasmallwhetherarguedconjecturedcoupling
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Minkowski and Ochs have recently argued that the small two photon coupling of a conjectured $\sigma(600)$ is so small that it is likely to be a glueball. We ask whether this can be so or whether it is simply gauge invariance that produces the observed low mass suppression?
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