The mass of the top quark is measured using a sample of ttbar events collected by the CMS detector using proton-proton collisions at √s=13 TeV at the CERN LHC. Events are selected with one isolated muon or electron and at least four jets from data corresponding to an integrated luminosity of 35.9 fb-1. For each event the mass is reconstructed from a kinematic fit of the decay products to a ttbar hypothesis. Using the ideogram method, the top quark mass is determined simultaneously with an overall jet energy scale factor (JSF), constrained by the mass of the W boson in qqbar′ decays. The measurement is calibrated on samples simulated at next-to-leading order matched to a leading-order parton shower. The top quark mass is found to be 172.25±0.08(stat+JSF)±0.62(syst)GeV. The dependence of this result on the kinematic properties of the event is studied and compared to predictions of different models of ttbar production, and no indications of a bias in the measurements are observed.
Measurement of the top quark mass with lepton+jets final states using pp collisions at √s=13TeV
Amapane N.;Argiro' S.;Bellan R.;Costa M.;Covarelli R.;Kiani B.;Migliore E.;Monaco V.;Monteil E.;Obertino M. M.;Pacher L.;Angioni G. L. P.;Romero A.;Sacchi R.;Sola V.;Solano A.;
2018-01-01
Abstract
The mass of the top quark is measured using a sample of ttbar events collected by the CMS detector using proton-proton collisions at √s=13 TeV at the CERN LHC. Events are selected with one isolated muon or electron and at least four jets from data corresponding to an integrated luminosity of 35.9 fb-1. For each event the mass is reconstructed from a kinematic fit of the decay products to a ttbar hypothesis. Using the ideogram method, the top quark mass is determined simultaneously with an overall jet energy scale factor (JSF), constrained by the mass of the W boson in qqbar′ decays. The measurement is calibrated on samples simulated at next-to-leading order matched to a leading-order parton shower. The top quark mass is found to be 172.25±0.08(stat+JSF)±0.62(syst)GeV. The dependence of this result on the kinematic properties of the event is studied and compared to predictions of different models of ttbar production, and no indications of a bias in the measurements are observed.File | Dimensione | Formato | |
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