Doctoral Dissertation Open Access
Schäfer, Daniela
<?xml version='1.0' encoding='UTF-8'?> <record xmlns="http://www.loc.gov/MARC21/slim"> <leader>00000nam##2200000uu#4500</leader> <datafield tag="856" ind1="4" ind2=" "> <subfield code="s">13048764</subfield> <subfield code="u">https://publish.etp.kit.edu/record/21712/files/main.pdf</subfield> <subfield code="z">md5:2edaba929e960ead952ebe7877fc4293</subfield> </datafield> <datafield tag="700" ind1=" " ind2=" "> <subfield code="a">Mozer, Matthias</subfield> <subfield code="u">KIT/ETP</subfield> <subfield code="4">ths</subfield> </datafield> <datafield tag="700" ind1=" " ind2=" "> <subfield code="a">Müller, Thomas</subfield> <subfield code="u">KIT/ETP</subfield> <subfield code="4">ths</subfield> </datafield> <datafield tag="980" ind1=" " ind2=" "> <subfield code="a">thesis</subfield> <subfield code="b">phd-thesis</subfield> </datafield> <datafield tag="260" ind1=" " ind2=" "> <subfield code="c">2019-12-06</subfield> </datafield> <datafield tag="041" ind1=" " ind2=" "> <subfield code="a">eng</subfield> </datafield> <datafield tag="909" ind1="C" ind2="O"> <subfield code="o">oai:publish.etp.kit.edu:21712</subfield> <subfield code="p">user-cms</subfield> <subfield code="p">user-etp</subfield> </datafield> <datafield tag="980" ind1=" " ind2=" "> <subfield code="a">user-cms</subfield> </datafield> <datafield tag="980" ind1=" " ind2=" "> <subfield code="a">user-etp</subfield> </datafield> <datafield tag="100" ind1=" " ind2=" "> <subfield code="a">Schäfer, Daniela</subfield> <subfield code="u">KIT/ETP</subfield> </datafield> <controlfield tag="005">20191218114046.0</controlfield> <datafield tag="653" ind1=" " ind2=" "> <subfield code="a">Diboson</subfield> </datafield> <datafield tag="653" ind1=" " ind2=" "> <subfield code="a">Resonance</subfield> </datafield> <datafield tag="653" ind1=" " ind2=" "> <subfield code="a">CMS</subfield> </datafield> <datafield tag="245" ind1=" " ind2=" "> <subfield code="a">Search for Diboson Resonances in the All-Hadronic Final State with the CMS Detector</subfield> </datafield> <controlfield tag="001">21712</controlfield> <datafield tag="520" ind1=" " ind2=" "> <subfield code="a"><p>A search for new resonances decaying to WW, WZ or ZZ in the all hadronic final state using<br> 77.3 fb &minus;1 of data taken with the CMS experiment at the CERN LHC at a center-of-mass<br> energy of 13 TeV is presented. The search focuses on potential new particles with a mass<br> at the TeV scale resulting in a high transverse momentum of the produced vector bosons.<br> The subsequent decay products of the vector bosons are therefore highly collimated and<br> reconstructed into a single large-radius jet, which are further classified using jet substructure<br> methods. The analysis presented utilizes a new data-driven background modeling technique<br> based on a template fit in a three-dimensional hyperspace spanned by the dijet invariant mass<br> and the corrected jet masses of the two final state jets. This method allows the utilization of<br> the full available signal yield while simultaneously constraining the background processes by<br> including the mass sideband regions in the fit. This grants the opportunity to easily expand<br> this framework to include VH, HH or more exotic signals with different messenger particles<br> in the future.<br> No significant excess is observed above the estimated standard model background and limits<br> are set at 95% confidence level on the cross section times branching fraction of a new particle,<br> which are interpreted in terms of various models that predict spin-2 gravitons or spin-1 vector<br> bosons. In a heavy vector triplet model, spin-1 Z&#39; and W&#39; resonances with masses below<br> 3.5 and 3.8 TeV, respectively, are excluded at 95% confidence level. In a narrow-width bulk<br> graviton model, upper limits on cross sections times branching fractions are set between 27<br> and 0.2 fb for resonance masses between 1.2 and 5.2 TeV, respectively. The limits presented<br> in this thesis are the best to date in the dijet final state.</p></subfield> </datafield> <datafield tag="542" ind1=" " ind2=" "> <subfield code="l">open</subfield> </datafield> </record>