Observation of Single Top-Quark Production

V. M. Abazov, B. Abbott, M. Abolins, B. S. Acharya, M. Adams, T. Adams, E. Aguilo, M. Ahsan, G. D. Alexeev, G. Alkhazov, A. Alton, G. Alverson (+491 others)
2009 Physical Review Letters  
We report observation of the electroweak production of single top quarks in ppbar collisions at sqrt(s) = 1.96 TeV based on 2.3 fb^-1 of data collected by the D0 detector at the Fermilab Tevatron Collider. Using events containing an isolated electron or muon and missing transverse energy, together with jets originating from the fragmentation of b quarks, we measure a cross section of sigma(ppbar -> tb + X, tqb + X) = 3.94 +- 0.88 pb. The probability to measure a cross section at this value or
more » ... at this value or higher in the absence of signal is 2.5 x 10^-7, corresponding to a 5.0 standard deviation significance for the observation.
doi:10.1103/physrevlett.103.092001 pmid:19792787 fatcat:nu5ug3wtijc3loqr5euo6srhmm