@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-tel-00862736v1> a dcat:Dataset ;
    dct:description """
              In this thesis we present the first measurement in the CMS experiment of the top-antitop production cross section in the tau+jets final state. To perform this measurement we designed a specific trigger requiring the presence of four jets, one of them being identified as an hadronic tau. The performance of this trigger has been studied in this thesis. A dataset of 3.9 fb-1 was collected with this trigger and analyzed. At offline level we needed to apply a sophisticated tau identification technique to identify the tau jets, based on the reconstruction of the intermediate resonances of the hadronic tau decay modes. Another crucial point was the b-jet identification, both to identify the b-jets in the final state and to modelize the background using a data driven technique. The studies done on the b-tag algorithms along the PhD period are also presented with particular attention to the ”Jet Probability” algorithm. It is the algorithm for which I performed the calibration since 2009 as well as the one used to tag the b-jets from the top decays. A neural network has been developed to separate the top-antitop events from the W+jets and multijet backgrounds. A binned likelihood fit to the neural network output distribution is done in order to extract the signal contribution from the background. A detailed estimation of the systematic uncertainties on the cross section measurement is also presented. The result for the cross section measurement, σ(tt) = 156 ± 12 (stat.) ± 33 (syst.) ± 3 (lumi) pb, is in perfect agreement with the standard model expectation.
            """ ;
    dct:identifier "NNT: 2012STRAE017" ;
    dct:issued "2026-05-09T17:27:33.697759"^^xsd:dateTime ;
    dct:language "en" ;
    dct:modified "2026-05-09T17:27:33.697764"^^xsd:dateTime ;
    dct:publisher <https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> ;
    dct:title "Measurement of the tt production cross section in the tau+jets channel in pp collisions at √S=7TeV [sqrt(S)=7TeV]" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "CCSD" ] ;
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    dcat:keyword "b-tagging",
        "cms-experiment",
        "collisionneur-lhc",
        "cross-section",
        "experience-cms",
        "identification-des-jets-de-quark-beau",
        "infoeu-reposemanticsdoctoralthesis",
        "lepton-tau",
        "lhc-accelerator",
        "modele-standard",
        "particle-physics",
        "physcondcm-genphysics-physicscondensed-matter-cond-matother-cond-matother",
        "physique-des-particules",
        "quark-top",
        "section-efficace",
        "standard-model",
        "systeme-de-declenchement",
        "tau-lepton",
        "theses",
        "top-quark",
        "trigger-system" ;
    dcat:landingPage <https://theses.hal.science/tel-00862736> .

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    dct:issued "2026-05-09T17:27:33.707528"^^xsd:dateTime ;
    dct:modified "2026-05-09T17:27:33.678376"^^xsd:dateTime ;
    dct:title "Measurement of the tt production cross section in the tau+jets channel in pp collisions at √S=7TeV [sqrt(S)=7TeV]" ;
    dcat:accessURL <https://theses.hal.science/tel-00862736> .

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