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@PHDTHESIS{Schlaffer:224253,
      author       = {Schlaffer, Matthias},
      title        = {{B}oosted {S}earches {F}or {N}ew {P}hysics {A}t {T}he
                      {LHC}},
      issn         = {1435-8085},
      school       = {Universität Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron},
      reportid     = {PUBDB-2015-03458, DESY-THESIS-2015-036},
      series       = {DESY-THESIS},
      pages        = {121},
      year         = {2015},
      note         = {Dissertation, Universität Hamburg, 2015},
      abstract     = {During the first run of the LHC, no apparent signs of new
                      physics beyond the StandardModel were discovered, but rather
                      the Standard Model-like properties of the Higgs
                      particleconfirmed. Therefore, new and powerful methods are
                      needed to disclose the traces of newphysics, which is
                      expected to be at the TeV scale in order to solve the
                      hierarchy problem.In this thesis, we propose two
                      complementary strategies for the quest for new physics atthe
                      LHC. First, we show how a very boosted Higgs in association
                      with a hard jet can beused to determine the important top
                      Yukawa coupling in gluon fusion. In the inclusive
                      gluonfusion process this is not feasible since possible
                      deviations from its Standard Model value arecombined and can
                      even cancel with the effective Higgs-gluon interaction
                      mediated by newtop partners. This cancellation is motivated
                      within minimal composite Higgs models butalso in certain
                      regions of the MSSM parameter space and can lead to a
                      Standard Model-likeinclusive cross section that allows no
                      conclusions on the mass spectrum of the new physics.We work
                      out in detail how this degeneracy can be broken in the
                      boosted Higgs channel andfind that even in the worst case
                      scenario with a Standard Model-like inclusive cross
                      section,the top Yukawa coupling can be constrained to
                      0.8–1.3 times its Standard Model value $at95\%$ CL with an
                      integrated luminosity of 3 000 fb −1 .The second strategy
                      is targeted at direct stop and sbottom searches in the fully
                      hadronictop decay channel. Since the stop, sbottom and
                      neutralino masses are unknown, verydifferent event shapes
                      are imaginable, ranging from unboosted top quarks and low
                      missingenergy to highly boosted top quarks and large missing
                      energy in the final state. In order tocover a wide range of
                      possible event shapes and consequently stop, sbottom, and
                      neutralinomasses, we combine several top taggers based on
                      jet substructure techniques to obtain ascale invariant
                      search strategy. The performance of this approach is shown
                      in a colliderstudy where we find that stops with masses up
                      to about 1 100 GeV can be excluded at $95\%CL$ with an
                      integrated luminosity of 100 fb −1 .},
      cin          = {T},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF3-611) / PHGS,
                      VH-GS-500 - PIER Helmholtz Graduate School
                      $(2015_IFV-VH-GS-500)$},
      pid          = {G:(DE-HGF)POF3-611 / $G:(DE-HGF)2015_IFV-VH-GS-500$},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      doi          = {10.3204/DESY-THESIS-2015-036},
      url          = {https://bib-pubdb1.desy.de/record/224253},
}