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Measurement of the top quark mass with lepton+jets final states using $pp$ collisions at $\sqrt{s}=13\,\text {TeV}$


Abstract

The mass of the top quark is measured using a sample of $t\bar t$ events collected by the CMS detector using proton-proton collisions at $\sqrt s =13 \text {TeV}$ 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 $35.9fb^{−1}$. For each event the mass is reconstructed from a kinematic fit of the decay products to a $t\bar t$ 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 $q\bar q′$ 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 $t\bar t$ production, and no indications of a bias in the measurements are observed.

Abstract

The mass of the top quark is measured using a sample of $t\bar t$ events collected by the CMS detector using proton-proton collisions at $\sqrt s =13 \text {TeV}$ 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 $35.9fb^{−1}$. For each event the mass is reconstructed from a kinematic fit of the decay products to a $t\bar t$ 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 $q\bar q′$ 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 $t\bar t$ production, and no indications of a bias in the measurements are observed.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2018
Deposited On:19 Feb 2019 13:10
Last Modified:24 Sep 2019 23:59
Publisher:Springer
ISSN:1434-6044
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1140/epjc/s10052-018-6332-9

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