Higgs Boson; Hadron Collider Physics ; Large Hadron Collider; Supersymmetry; Pixel Detector Technology
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Zhu D., Backhaus M., Berger P., Meinhard M., Starodumov A., Tavolaro V. (2018), Qualification and calibration tests of detector modules for the CMS Pixel Phase 1 upgrade, in Journal of Instrumentation
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Meinhard M., Backhaus M., Berger P., Starodumov A. (2017), Performance of the modules for layer 1 of the CMS phase 1 pixel detector upgrade, in Journal of Instrumentation (JINST)
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Kasieczka Gregor, Plehn Tilman, Russell Michael, Schell Torben (2017), Deep-learning top taggers or the end of QCD?, in Journal of High Energy Physics
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Starodumov A., Berger P., Meinhard M. (2017), High rate capability and radiation tolerance of the PROC600 readout chip for the CMS pixel detector, in Journal of Instrumentation
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Butter A., Kasieczka G., Plehn T., Russell M., Deep-learned Top Tagging with a Lorentz Layer, in SciPost Physics
With this continuation grant proposal, we would like to request support for our research program in high energy particle physics tackling fundamental questions of the field. The research proposed is conducted with the Compact Muon Solenoid (CMS) experiment operating at the Large Hadron Collider (LHC) at the European Center for Particle Physics (CERN). The proposal is driven by the exploitation of LHC Run 2 at 13 TeV that is now underway providing excellent prospects for the exploration of physics at the TeV energy scale. We also prepare for the upgrades of the CMS detector necessitated by the continuing and future improvements of the LHC accelerator. With the spectacular discovery of a Higgs boson at CERN, a success to which scientists of this proposal have contributed in a leading manner, the measurement of its properties becomes a high priority in order to elucidate whether the new particle indeed plays a crucial role in the mechanism of electroweak symmetry breaking. The precision measurements of its properties will furthermore reveal whether there is physics beyond the Standard Model (SM), such as Supersymmetry (SUSY). Such physics is expected, since without it counterintuitive (and hence theoretically unattractive) fine tuning in the Higgs boson’s radiative corrections would be required to ensure the SM’s validity beyond energy scales of a few Tera-Electronvolts (TeV). In addition, astronomical observations suggest that there is “Dark Matter” in the Universe, the particle physics description of which is still lacking and for which SUSY could provide a viable particle candidate.This proposal attacks these issues in a three-fold manner. We will attempt to firmly establish the existence of the Higgs boson decaying into two b-quarks using the production mode in association with a vector boson (W or Z). This process allows the extraction of the couplings of the Higgs boson to b-quarks and W or Z-bosons. We improve this long-standing effort of the CMS ETH group by extending our efforts in this decay channel by including the vector fusion production process. We will also exploit jet substructure techniques to identify highly boosted b-jets. These methods will also be employed for a new initiative proposed by this funding request which focuses on Higgs boson production in association with top quarks. This process allows the direct extraction of the top-Yukawa coupling to the Higgs field, a fundamental parameter of electroweak symmetry breaking.We continue the search for SUSY using the dilepton final state and expand our searches to multi-lepton final states. The search for SUSY in the same-sign dilepton final state is not only sensitive to the production of SUSY particles via the strong force, but with a suitable optimization is also sensitive to electroweak SUSY production, a channel which becomes important if the mass hierarchy for SUSY squarks and gluinos is beyond the energy reach of the LHC. In the opposite sign dilepton channel, based on the 8 TeV data set of Run 1 we have observed an intriguing deviation (2.6 sigma) in the invariant mass spectrum of the two leptons that could be a background fluctuation or first indication of new physics. During the duration of this grant proposal, we are confident to elucidate the origin of this excess.Our proposal further requests support to continue hardware work for the upgrades of one of the key components of CMS, the barrel pixel detector. Currently the construction of the phase 1 upgrade pixel detector is in full swing, with commissioning of the detector planned for early 2017. Within CMS several consortia have formed to collaborate on the phase 1 upgrade, with ETH Zurich, PSI and University of Zurich forming the Swiss consortium. The role of the ETH Zurich group within the Swiss consortium is the important task of module testing and quality assurance of all modules that will be integrated in the barrel pixel detector.