More Quarks?

• November, 1974: J/? particle discovered which doesn’t fit!

  • Interpretation: evidence for new quark: c (charm). J/? = cc

• Similar case in 1977: ?(Upsilon) particle discovered.

  • Interpretation: evidence for new quark: b (bottom). Y = bb

• Five quarks in 1993. The b quark partner was missing!

• Search for the top quark. Discovery in 1995 by CDF experiment at Fermilab. UIUC important collaborator.

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