Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10722268 | Physics Letters B | 2012 | 22 Pages |
Abstract
The results of a search for the pair production of a fourth-generation up-type quark (tâ²) in proton-proton collisions at s=7 TeV are presented, using data corresponding to an integrated luminosity of about 5.0 fbâ1 collected by the Compact Muon Solenoid experiment at the LHC. The tâ² quark is assumed to decay exclusively to a W boson and a b quark. Events with a single isolated electron or muon, missing transverse momentum, and at least four hadronic jets, of which at least one must be identified as a b jet, are selected. No significant excess of events over standard model expectations is observed. Upper limits for the tâ²t¯Ⲡproduction cross section at 95% confidence level are set as a function of tâ² mass, and tâ²-quark production for masses below 570 GeV is excluded. The search is equally sensitive to nonchiral heavy quarks decaying to Wb. In this case, the results can be interpreted as upper limits on the production cross section times the branching fraction to Wb.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
CMS Collaboration CMS Collaboration, S. Chatrchyan, V. Khachatryan, A.M. Sirunyan, A. Tumasyan, W. Adam, E. Aguilo, T. Bergauer, M. Dragicevic, J. Erö, C. Fabjan, M. Friedl, R. Frühwirth, V.M. Ghete, J. Hammer, N. Hörmann, J. Hrubec, M. Jeitler,