We present first evidence for the production of single top quarks at the Fermilab Tevatron { \ppbar} collider. Both D0 and CDF experiments have measured the single top production cross section with a 3-standard-deviation significance using 0.9 fb$^{ -1}$ and 2.2 fb$^{ -1}$ of lepton+jets data, respectively. A direct measurement of the CKM matrix element that describes the $Wtb$ coupling is also performed for the first time.
Categories: hep-ex