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

Meridiani P.;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.
2018
78
891
1
27
http://dx.doi.org/10.1140/epjc/s10052-018-6332-9
LHC, CMS, top quark mass
Sirunyan A.M.; Tumasyan A.; Adam W.; Ambrogi F.; Asilar E.; Bergauer T.; Brandstetter J.; Brondolin E.; Dragicevic M.; Ero J.; Del Valle A.E.; Flechl ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1768616
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