Search for charge-asymmetric production of W bosons in t(t)over-bar + jet events from pp collisions at root s=7 TeV
CMS Collaboration (ukupan broj autora: 2192)
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A search is presented for charge-asymmetric production of a W boson that has been proposed to accommodate the forward-backward asymmetry observed in the production of top-antitop quark pairs at the Tevatron. The new heavy W boson would be produced in association with a top quark and would decay into top and down quarks. The data correspond to an integrated luminosity of 5.0 fb(-1) in pp collisions at a center-of-mass energy of 7 TeV, recorded by the CMS detector at the LHC. No significant excess above the standard model expectations is observed, and, from a combination of the electron-plus-jets and muon-plus-jets channels, a 95% confidence level lower limit of 840 GeV/c(2) is set on the W boson mass for a W boson model with values for coupling constants to top and down quarks g(L) = 0 and g(R) = 2. In addition, a kinematic reconstruction of the W resonance mass using the inherent charge asymmetry of this model finds no indication of the presence of W events in the data. (C) 2012 CERN. ...Published by Elsevier B.V. All rights reserved.
Keywords:CMS / W / Top pair
Source:Physics Letters B, 2012, 717, 4-5, 351-370
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