Issue Date: Feb 15, 1993
PARTICLE physicists at Fermilab near Chicago may have sighted the elusive "top" quark, one of the smallest constituents of matter (Science, Vol 258, No 5086; New Scientist, Vol 136, No 1851). An experiment at the Tevatron collider -a large particle smasher -yielded a pattern of particle debris that was anticipated when a bigger particle breaks down. When a proton and anti-proton collide, a top quark and an anti-top quark form and then decay into other particles.
The "top" is one of six types of quarks believed to exist and the only
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