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| physical object > natural object > particle > hypothetical particle > glueball |
| glueball comparison table | ||
| Subject | has definition | is a kind of |
|---|---|---|
| hypothetical particle | particle | |
| glueball | Theoretical particles made exclusively of gluons. Tentative evidence of the existence of glueballs had been found in accelerator experiments by the mid-1980s. | hypothetical particle |
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