% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@PHDTHESIS{Milella:646071,
      author       = {Milella, Gabriele},
      othercontributors = {Blekman, Freya and Krüger, Katja},
      title        = {{F}rom {D}etector {D}evelopment to {N}ew {P}hysics
                      {S}earches: {CMS} {HGCAL} {V}alidation and {S}earch for
                      {T}op-{P}hilic {R}esonances {U}sing {V}ariable-{R}adius
                      {J}et {T}agging},
      school       = {Universität Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron DESY},
      reportid     = {PUBDB-2026-00711, DESY-THESIS-2026-004},
      series       = {DESY-THESIS},
      pages        = {185},
      year         = {2026},
      note         = {Dissertation, Universität Hamburg, 2026},
      abstract     = {This thesis presents two research works carried out within
                      the Compact Muon Solenoid (CMS) experiment at the CERN Large
                      Hadron Collider (LHC): the system validation of the
                      scintillator section of the High Granularity Calorimeter
                      (HGCAL), and a search for a heavy resonance coupling to top
                      quarks and produced in association with top quark pairs in
                      proton–proton collisions at center-of-mass energies of 13
                      and 13.6 TeV. For the High-Luminosity LHC (HL-LHC) phase,
                      the endcap calorimeters of CMS will be replaced by the
                      HGCAL, a high-precision sampling calorimeter designed to
                      cope with the extreme radiation and pileup conditions
                      expected at the HL-LHC. In regions where radiation levels
                      remain moderate, the hadronic section employs scintillator
                      tiles coupled to silicon photomultipliers (SiPM-on-tile) as
                      active materials. Each HGCAL tilemodule, the basic detector
                      unit of this region, accommodates up to 144 SiPM-on-tile
                      channels read out by dedicated front-end electronics. The
                      performance of several tilemodules was evaluated during
                      test-beam campaigns at the DESY-II facility using 3 GeV
                      electron beams. The measurements serve to validate the
                      response and uniformity of the detector components and to
                      confirm that they meet the design specifications for HL-LHC
                      operation. A search for a new heavy resonance that couples
                      exclusively to top quarks and is produced in association
                      with a top quark pair is presented. The analysis uses
                      proton–proton collision data collected with the CMS
                      detector at center-of-mass energies of 13 TeV (2016–2018)
                      and 13.6 TeV (2022). The search targets the final state with
                      two oppositely charged leptons from the W boson decays of
                      the nonresonant top quarks, and two high-energy jets
                      reconstructing the hadronically decaying resonant top
                      quarks. In this scenario, the two top quarks from the
                      resonance decay are expected to be highly Lorentz-boosted.
                      Their hadronic decays are reconstructed using jets clustered
                      with a variable-radius algorithm and identified with a
                      dedicated top quark tagger based on a boosted decision tree
                      (BDT). Events are selected in a final state containing
                      opposite-sign leptons and b-tagged jets, and the resonance
                      mass is reconstructed from pairs of tagged top jets. The
                      analysis probes resonance masses between 500 GeV and 4 TeV
                      and searches for local excesses in the reconstructed mass
                      spectrum. The results are interpreted in the context of
                      models with vector-like, scalar and pseudoscalar resonances
                      produced in association with top quarks, representing the
                      first such interpretation performed with CMS data.},
      cin          = {CMS},
      cid          = {I:(DE-H253)CMS-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611)},
      pid          = {G:(DE-HGF)POF4-611},
      experiment   = {EXP:(DE-H253)LHC-Exp-CMS-20150101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      doi          = {10.3204/PUBDB-2026-00711},
      url          = {https://bib-pubdb1.desy.de/record/646071},
}