David Strom 1 May 2002 University of Oregon Lo oking back at LEP: What were the weakest links? ... Concentrate on: · exp erimental challenges · theory errors which can't b e fixed later Ignore theory errors which can b e reduced later Fermilab 1 May 2002 2 David Strom ­ Oregon You b e the judge of how seriously to take this curve: 6 theory uncertainty Da 0.02761±0.00036 (5) had = 4 0.02747±0.00012 Dc 2 ... Weakest links are a small fraction of errors. ... 5 10 20 5 0 GeV 0 . ...