Search for charge-asymmetric production of W$′$ bosons in $t\\bar{t} +$ jet events from pp collisions at $\\sqrt{s} =$ 7 TeV
Journal
Physics Letters
Journal Volume
B717
Pages
351-370
Date Issued
2012-06
Author(s)
Abstract
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-plusjets 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.
Type
journal article