Evidence for Associated Production of a Single Top Quark and W Boson in pp Collisions at √s=7 TeV

• Main Authors: Apyan, Aram (Contributor), Bauer, Gerry P. (Contributor), Bendavid, J. (Contributor), Busza, Wit (Contributor), Butz, Erik M. (Contributor), Cali, Ivan Amos (Contributor), Chan, Matthew Hans (Contributor), Dutta, Valentina (Contributor), Goncharov, Maxim (Contributor), Hahn, Kristian Allan (Contributor), Kim, Y. (Contributor), Klute, Markus (Contributor), Krajczar, Krisztian F. (Contributor), Luckey, P. David, Jr (Contributor), Ma, Teng (Contributor), Nahn, S. (Contributor), Paus, Christoph M. E. (Contributor), Ralph, D. (Contributor), Roland, Christof E. (Contributor), Roland, Gunther M. (Contributor), Rudolph, M. (Contributor), Stephans, George S. F. (Contributor), Stockli, F. (Contributor), Sumorok, Konstanty C. (Contributor), Sung, K. (Contributor), Velicanu, D. (Contributor), Wenger, Edward Allen (Contributor), Wolf, R. (Contributor), Wyslouch, Boleslaw (Contributor), Yang, M. (Contributor), Yilmaz, Y. (Contributor), Yoon, A. S. (Contributor), Zanetti, Marco (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Nuclear Science and Engineering (Contributor), Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor), Gomez-Ceballos, Guillelmo (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2013-04-25T19:58:36Z.
• Subjects: Article
• Online Access: Get fulltext

Evidence is presented for the associated production of a single top quark and W boson in pp collisions at √s=7  TeV with the CMS experiment at the LHC. The analyzed data correspond to an integrated luminosity of 4.9  fb[superscript -1]. The measurement is performed using events with two leptons and a jet originated from a b quark. A multivariate analysis based on kinematic properties is utilized to separate the tt̅ background from the signal. The observed signal has a significance of 4.0σ and corresponds to a cross section of 16-4[superscript +5 ] pb, in agreement with the standard model expectation of 15.6±0.4-1.2[superscript +1.0]  pb.
National Science Foundation (U.S.)
United States. Dept. of Energy