Measurement of the top-quark mass in t t-bar events with lepton+jets final states in pp collisions at sqrt(s)=8 TeV

The mass of the top quark is measured using a sample of $\rm{t}\bar{\rm t}$ candidate events with one electron or muon and at least four jets in the final state, collected by CMS in pp collisions at $\sqrt{s}=8$~TeV at the LHC. The candidate events are selected from data corresponding to an integrated luminosity of 19.7~fb$^{-1}$. For each event the mass is reconstructed from a kinematic fit of the decay products to a $\rm{t}\bar{\rm t}$ hypothesis. The top-quark mass is determined simultaneously with an overall jet energy scale factor (JSF), constrained by the known mass of the W boson in $\rm{q}\bar{\rm q}$ decays. Studies of their kinematic dependence are performed to confirm that the data are well modeled by the simulation. The top-quark mass is measured to be $172.04\pm 0.19\,\text{(stat.+JSF)} \pm 0.75\,\text{(syst.)}$~GeV. The combination with previously published measurements by CMS yields a mass of $172.22\pm0.73$~GeV.