Search for W′ → tb in proton-proton collisions at s=8 TeV

A search is performed for the production of a massive W' bosondecaying to a top and a bottom quark. The data analysed correspond to an integrated luminosity of 19.7 inverse-femtobarns collected with the CMS detector at the LHC in proton-proton collisions at sqrt(s) = 8 TeV. The hadronic decay productsof the top quarkwith high Lorentz boost from the W' bosondecay are detected as a single top flavoured jet. The use of jet substructure algorithms allows the top quarkjet to be distinguished from standard model QCD background. Limits on the production cross section of a right-handed W' bosonare obtained, together with constraints on the left-handed and right-handed couplings of the W' bosonto quarks. The production of a right-handed W' bosonwith a mass below 2.02 TeV decaying to a hadronic final state is excluded at 95\% confidence level. This mass limit increases to 2.15 TeV when both hadronic and leptonic decays are considered, and is the most stringent lower mass limit to date in the tb decay mode.