On 8 December, scientists from the D0 experiment at Fermilab's Tevatron announced the first evidence for top quarks produced singly, rather than in pairs. The top quark has played a prominent role in the physics programme at the Tevatron ever since it was discovered there nearly 12 years ago. Just before the discovery in 1995, D0 collaborators were already turning their attention to the electroweak production of single top quarks, with theorists suggesting that the cross-section should be large enough to observe in the Tevatron's proton-antiproton collisions.
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