Abazov, V. M. and Abbott, B. and Abolins, M. and Acharya, B. S. and Adams, M. and Adams, T. and Aguilo, E. and Ahsan, M. and Alexeev, G. D. and Alkhazov, G. and Alton, A. and Alverson, G. and Alves, G. A. and Ancu, L. S. and Andeen, T. and Anzelc, M. S. and Aoki, M. and Arnoud, Y. and Arov, M. and Arthaud, M. and Askew, A. and Asman, B. and Atramentov, O. and Avila, C. and BackusMayes, J. and Badaud, F. and Bagby, L. and Baldin, B. and Bandurin, D. V. and Banerjee, P. and Banerjee, S. and Barberis, E. and Barfuss, A. -F. and Bargassa, P. and Baringer, P. and Barreto, J. and Bartlett, J. F. and Bassler, U. and Bauer, D. and Beale, S. and Bean, A. and Beri, S. B. and Bertram, I. and Borissov, G. and Fox, H. and Johnson, M. and Love, P. and Ratoff, P. N. and Sopczak, A. and Williams, M. R. J. (2009) Observation of Single Top-Quark Production. Physical review letters, 103 (9): 092001. -. ISSN 0031-9007
Abstract
We report observation of the electroweak production of single top quarks in pp collisions at 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(pp -> tb+X,tqb+X)=3.94 +/- 0.88 pb. The probability to measure a cross section at this value or higher in the absence of signal is 2.5x10(-7), corresponding to a 5.0 standard deviation significance for the observation.