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A reanalysis is presented on the CMS result on a search for a W' boson thatcouples to the top and down quarks. The model is motivated by the Tevatronresults on the forward-backward asymmetry of ttbar pair production. In theevaluation of the theoretical cross section of pp -> ttbar + j, theinterference effect between the SM and W' amplitudes is shown to be important,though it is ignored in the CMS analysis. The lower mass bound on the W' bosonis relaxed from 840 GeV to 740 GeV at the 95% C.L. due to the interferenceeffect. The bound is also compared to the top forward-backward asymmetry.

Comment on the CMS search for charge-asymmetric production of W' boson in ttbar + jet events