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Jet energy calibration and triple differential inclusive cross section measurements with Z (→ μμ) + jet events at 13 TeV recorded by the CMS detector

This thesis presents two substantial aspects of the analysis of Z boson production in association with jets, where the Z boson decays to a muon-antimuon pair: jet energy calibration and triple differential cross section measurements. Data have been used that were recorded with the CMS detector in th...

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Autor principal: Berger, Thomas
Lenguaje:eng
Publicado: 2019
Materias:
Acceso en línea:http://cds.cern.ch/record/2704521
https://dx.doi.org/10.5445/IR/1000104286
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author Berger, Thomas
author_facet Berger, Thomas
author_sort Berger, Thomas
collection CERN
description This thesis presents two substantial aspects of the analysis of Z boson production in association with jets, where the Z boson decays to a muon-antimuon pair: jet energy calibration and triple differential cross section measurements. Data have been used that were recorded with the CMS detector in the year 2016 at a center-of-mass energy of 13 TeV. These data correspond to an integrated luminosity of 35.9 fb$^{-1}$ of proton-proton collisions at the LHC. The first part of this thesis contributes to the jet energy calibration in CMS by estimating residual corrections that account for differences in jet reconstruction between measurement and simulation. Correction factors are extracted from Z (→μμ) + jet events by comparing the transverse momentum of a jet to the one of a balancing Z boson, which can be reconstructed very precisely from muons. The second part of this thesis presents triple differential measurements of inclusive cross sections for Z (→μμ) + jet production. The cross sections are measured as a function of the Z boson transverse momentum $p_T^Z$ or alternatively the variable $\phi^*_\eta$ , the rapidity separation $y^*$ of the Z boson and the leading jet, and the boost $y_\mathrm{b}$ of their center-of-mass system. The observable $\phi^*_\eta$ has the advantage to be determined from angular information of the muons only, thereby further increasing the reconstruction precision in comparison to $p_T^Z$ . The observables $y^*$ and $y_\mathrm{b}$ introduce a division of the phase space that promises a better sensitivity to the parton subprocesses and thus the PDFs. The measured cross sections are corrected for detector effects by a three-dimensional unfolding procedure and are compared to theory predictions calculated at next-to-next-to-leading order in perturbative QCD.
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spelling cern-27045212020-02-25T15:56:54Zhttp://cds.cern.ch/record/2704521engBerger, ThomasJet energy calibration and triple differential inclusive cross section measurements with Z (→ μμ) + jet events at 13 TeV recorded by the CMS detectorParticle Physics - ExperimentThis thesis presents two substantial aspects of the analysis of Z boson production in association with jets, where the Z boson decays to a muon-antimuon pair: jet energy calibration and triple differential cross section measurements. Data have been used that were recorded with the CMS detector in the year 2016 at a center-of-mass energy of 13 TeV. These data correspond to an integrated luminosity of 35.9 fb$^{-1}$ of proton-proton collisions at the LHC. The first part of this thesis contributes to the jet energy calibration in CMS by estimating residual corrections that account for differences in jet reconstruction between measurement and simulation. Correction factors are extracted from Z (→μμ) + jet events by comparing the transverse momentum of a jet to the one of a balancing Z boson, which can be reconstructed very precisely from muons. The second part of this thesis presents triple differential measurements of inclusive cross sections for Z (→μμ) + jet production. The cross sections are measured as a function of the Z boson transverse momentum $p_T^Z$ or alternatively the variable $\phi^*_\eta$ , the rapidity separation $y^*$ of the Z boson and the leading jet, and the boost $y_\mathrm{b}$ of their center-of-mass system. The observable $\phi^*_\eta$ has the advantage to be determined from angular information of the muons only, thereby further increasing the reconstruction precision in comparison to $p_T^Z$ . The observables $y^*$ and $y_\mathrm{b}$ introduce a division of the phase space that promises a better sensitivity to the parton subprocesses and thus the PDFs. The measured cross sections are corrected for detector effects by a three-dimensional unfolding procedure and are compared to theory predictions calculated at next-to-next-to-leading order in perturbative QCD.CERN-THESIS-2019-243DOI:10.5445/IR/1000104286oai:cds.cern.ch:27045212019-12-16T16:17:06Z
spellingShingle Particle Physics - Experiment
Berger, Thomas
Jet energy calibration and triple differential inclusive cross section measurements with Z (→ μμ) + jet events at 13 TeV recorded by the CMS detector
title Jet energy calibration and triple differential inclusive cross section measurements with Z (→ μμ) + jet events at 13 TeV recorded by the CMS detector
title_full Jet energy calibration and triple differential inclusive cross section measurements with Z (→ μμ) + jet events at 13 TeV recorded by the CMS detector
title_fullStr Jet energy calibration and triple differential inclusive cross section measurements with Z (→ μμ) + jet events at 13 TeV recorded by the CMS detector
title_full_unstemmed Jet energy calibration and triple differential inclusive cross section measurements with Z (→ μμ) + jet events at 13 TeV recorded by the CMS detector
title_short Jet energy calibration and triple differential inclusive cross section measurements with Z (→ μμ) + jet events at 13 TeV recorded by the CMS detector
title_sort jet energy calibration and triple differential inclusive cross section measurements with z (→ μμ) + jet events at 13 tev recorded by the cms detector
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2704521
https://dx.doi.org/10.5445/IR/1000104286
work_keys_str_mv AT bergerthomas jetenergycalibrationandtripledifferentialinclusivecrosssectionmeasurementswithzmmjeteventsat13tevrecordedbythecmsdetector