Speaker
Mr
Markus Seidel
(Uni Hamburg)
Description
The mass of the top quark is measured using a sample of ttbar candidate events with one electron or muon and at least four jets in the final state, collected by CMS in pp collisions at √s=8 TeV at the LHC. The candidate events are selected from data corresponding to an integrated luminosity of 19.7/fb. For each event the mass is reconstructed from a kinematic fit of the decay products to a ttbar 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 qqbar decays. Studies of their kinematic dependence are performed to confirm that the data is well modeled in the simulation. The top-quark mass is measured to be 172.04 ± 0.19 (stat.+JSF) ± 0.75 (syst.) GeV. The combination with previously published measurements by CMS yields a mass of 172.22 +- 0.73 GeV.
Primary author
Mr
Markus Seidel
(Uni Hamburg)
