A top quark mass measurement is performed using 35.9fb-1 of LHC proton–proton collision data collected with the CMS detector at sqrt(s)=13TeV. The measurement uses the t tbar all-jets final state. A kinematic fit is performed to reconstruct the decay of the t tbar system and suppress the multijet background. Using the ideogram method, the top quark mass (m_t ) is determined, simultaneously constraining an additional jet energy scale factor (JSF). The resulting value of mt=172.34±0.20(stat+JSF)±0.70(syst)GeV is in good agreement with previous measurements. In addition, a combined measurement that uses the t tbar lepton+jets and all-jets final states is presented, using the same mass extraction method, and provides an m t measurement of 172.26±0.07(stat+JSF)±0.61(syst)GeV. This is the first combined m t extraction from the lepton+jets and all-jets channels through a single likelihood function.
Measurement of the top quark mass in the all-jets final state at √s=13TeV and combination with the lepton+jets channel
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.;Romero A.;Sacchi R.;Sola V.;Solano A.;Rumerio P.;Ravera F.;
2019-01-01
Abstract
A top quark mass measurement is performed using 35.9fb-1 of LHC proton–proton collision data collected with the CMS detector at sqrt(s)=13TeV. The measurement uses the t tbar all-jets final state. A kinematic fit is performed to reconstruct the decay of the t tbar system and suppress the multijet background. Using the ideogram method, the top quark mass (m_t ) is determined, simultaneously constraining an additional jet energy scale factor (JSF). The resulting value of mt=172.34±0.20(stat+JSF)±0.70(syst)GeV is in good agreement with previous measurements. In addition, a combined measurement that uses the t tbar lepton+jets and all-jets final states is presented, using the same mass extraction method, and provides an m t measurement of 172.26±0.07(stat+JSF)±0.61(syst)GeV. This is the first combined m t extraction from the lepton+jets and all-jets channels through a single likelihood function.File | Dimensione | Formato | |
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