December 6, 2019 Doctoral Dissertation Open Access

Schäfer, Daniela

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        "affiliation": "KIT/ETP", 
        "name": "Sch\u00e4fer, Daniela"
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    "description": "<p>A search for new resonances decaying to WW, WZ or ZZ in the all hadronic final state using<br>\n77.3 fb &minus;1 of data taken with the CMS experiment at the CERN LHC at a center-of-mass<br>\nenergy of 13 TeV is presented. The search focuses on potential new particles with a mass<br>\nat the TeV scale resulting in a high transverse momentum of the produced vector bosons.<br>\nThe subsequent decay products of the vector bosons are therefore highly collimated and<br>\nreconstructed into a single large-radius jet, which are further classified using jet substructure<br>\nmethods. The analysis presented utilizes a new data-driven background modeling technique<br>\nbased on a template fit in a three-dimensional hyperspace spanned by the dijet invariant mass<br>\nand the corrected jet masses of the two final state jets. This method allows the utilization of<br>\nthe full available signal yield while simultaneously constraining the background processes by<br>\nincluding the mass sideband regions in the fit. This grants the opportunity to easily expand<br>\nthis framework to include VH, HH or more exotic signals with different messenger particles<br>\nin the future.<br>\nNo significant excess is observed above the estimated standard model background and limits<br>\nare set at 95% confidence level on the cross section times branching fraction of a new particle,<br>\nwhich are interpreted in terms of various models that predict spin-2 gravitons or spin-1 vector<br>\nbosons. In a heavy vector triplet model, spin-1 Z&#39; and W&#39; resonances with masses below<br>\n3.5 and 3.8 TeV, respectively, are excluded at 95% confidence level. In a narrow-width bulk<br>\ngraviton model, upper limits on cross sections times branching fractions are set between 27<br>\nand 0.2 fb for resonance masses between 1.2 and 5.2 TeV, respectively. The limits presented<br>\nin this thesis are the best to date in the dijet final state.</p>", 
    "keywords": [
      "Diboson", 
      "Resonance", 
      "CMS"
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    "language": "eng", 
    "publication_date": "2019-12-06", 
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      "subtype": "phd-thesis", 
      "title": "Doctoral Dissertation", 
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    "thesis": {
      "report_number": "ETP-KA/2019-18", 
      "supervisors": [
        {
          "affiliation": "KIT/ETP", 
          "name": "Mozer, Matthias"
        }, 
        {
          "affiliation": "KIT/ETP", 
          "name": "M\u00fcller, Thomas"
        }
      ]
    }, 
    "title": "Search for Diboson Resonances in the All-Hadronic Final State with the CMS Detector"
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