Upsilons (IMAGE)
Caption
Scientists used the STAR detector at the Relativistic Heavy Ion Collider (RHIC) to track how upsilon particles dissociate in quark-gluon plasma. These upsilons are made of a bottom quark and antibottom quark held together by gluons with different binding energies: a tightly bound ground state (left), an intermediate variety (right), and the largest, most loosely bound state (center).
Credit
Brookhaven National Laboratory
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