Search for narrow t + b resonances in the leptonic final state at sqrt(s) = 8 TeV

We present a search for the production of a heavy gauge boson $\mathrm{W^\prime}$ decaying into a top quark and a bottom quark using a dataset collected during 2012 by the CMS experiment at $\sqrt{s}=8$ TeV, corresponding to an integrated luminosity of 19.6 fb$^{-1}$. We study different models of $\mathrm{W^\prime}$ boson production in the $\mathrm{W^\prime}$ to $\mathrm{tb}$ decay mode, investigating an arbitrary combination of left- and right-handed couplings. The analysis is based on events with the final state signature lepton ($\mathrm{e}, \mu$) plus jets and missing transverse energy. We find no evidence for $\mathrm{W^\prime}$ boson production and set 95\% C.L. upper limits on the production cross-section. For $\mathrm{W^\prime}$ bosons with purely right-handed couplings, and for those with left-handed couplings when ignoring interference with the Standard Model, the observed (expected) 95\% C.L. limit is $M_{\mathrm{W^\prime}}>$ 2.03(2.09) TeV.