December 6, 2019 Doctoral Dissertation Open Access

Schäfer, Daniela

MARC21 XML Export

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    <subfield code="a">Schäfer, Daniela</subfield>
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    <subfield code="a">Search for Diboson Resonances in the All-Hadronic Final State with the CMS Detector</subfield>
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    <subfield code="a">eng</subfield>
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    <subfield code="a">&lt;p&gt;A search for new resonances decaying to WW, WZ or ZZ in the all hadronic final state using&lt;br&gt;
77.3 fb &amp;minus;1 of data taken with the CMS experiment at the CERN LHC at a center-of-mass&lt;br&gt;
energy of 13 TeV is presented. The search focuses on potential new particles with a mass&lt;br&gt;
at the TeV scale resulting in a high transverse momentum of the produced vector bosons.&lt;br&gt;
The subsequent decay products of the vector bosons are therefore highly collimated and&lt;br&gt;
reconstructed into a single large-radius jet, which are further classified using jet substructure&lt;br&gt;
methods. The analysis presented utilizes a new data-driven background modeling technique&lt;br&gt;
based on a template fit in a three-dimensional hyperspace spanned by the dijet invariant mass&lt;br&gt;
and the corrected jet masses of the two final state jets. This method allows the utilization of&lt;br&gt;
the full available signal yield while simultaneously constraining the background processes by&lt;br&gt;
including the mass sideband regions in the fit. This grants the opportunity to easily expand&lt;br&gt;
this framework to include VH, HH or more exotic signals with different messenger particles&lt;br&gt;
in the future.&lt;br&gt;
No significant excess is observed above the estimated standard model background and limits&lt;br&gt;
are set at 95% confidence level on the cross section times branching fraction of a new particle,&lt;br&gt;
which are interpreted in terms of various models that predict spin-2 gravitons or spin-1 vector&lt;br&gt;
bosons. In a heavy vector triplet model, spin-1 Z&amp;#39; and W&amp;#39; resonances with masses below&lt;br&gt;
3.5 and 3.8 TeV, respectively, are excluded at 95% confidence level. In a narrow-width bulk&lt;br&gt;
graviton model, upper limits on cross sections times branching fractions are set between 27&lt;br&gt;
and 0.2 fb for resonance masses between 1.2 and 5.2 TeV, respectively. The limits presented&lt;br&gt;
in this thesis are the best to date in the dijet final state.&lt;/p&gt;</subfield>
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