{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/157578"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/157578","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Exploring New Frontiers in High Energy Physics: Boosted Resonances Decaying To Quarks, Foundation Models, and Heterogeneous Computing at the CMS Experiment","abstract":"In this thesis, we introduce machine learning (ML) tools to optimize data taking and analysis at data-intensive scientific experiments, focusing on the CMS experiment at the Large Hadron Collider (LHC). A path to a foundation model for LHC physics is described, where self-supervised learning is enabled through the re-simulation of decaying partons. The first experiments with remote operation of GPUs in LHC experiments are presented. These tools will help equip experiments at the High-Luminosity LHC (HL-LHC) to perform precision measurements and searches for new physics, for example, low mass resonances decaying to quarks. In this context, a search for narrow resonances decaying into quarkantiquark pairs produced with high transverse momentum is presented. The analysis is based on data collected in Run 2 with the CMS detector at the LHC in proton-proton collisions at √ 𝑠 = 13 TeV. Resonance candidates are reconstructed as large-radius jets and identified using a state-of-the-art jet tagging algorithm. This analysis presents the most sensitive limits for new spin-1 bosons coupling universally to quarks and spin-0 bosons coupling preferentially to heavier quarks. The invariant jet mass spectrum is probed for a potential narrow peaking signal over a smoothly falling background. Upper limits at 95% confidence level are set on the coupling of narrow resonances to quarks as a function of the resonance mass. For masses between 50 and 300 GeV, these are the most sensitive limits to date on all possible mediators. Using conventions on s-channel dark matter mediators, limits are set on dark photons and dark matter in the context of the relic density.","abstract_html":"In this thesis, we introduce machine learning (ML) tools to optimize data taking and analysis at data-intensive scientific experiments, focusing on the CMS experiment at the Large Hadron Collider (LHC). A path to a foundation model for LHC physics is described, where self-supervised learning is enabled through the re-simulation of decaying partons. The first experiments with remote operation of GPUs in LHC experiments are presented. These tools will help equip experiments at the High-Luminosity LHC (HL-LHC) to perform precision measurements and searches for new physics, for example, low mass resonances decaying to quarks. In this context, a search for narrow resonances decaying into quarkantiquark pairs produced with high transverse momentum is presented. The analysis is based on data collected in Run 2 with the CMS detector at the LHC in proton-proton collisions at √ 𝑠 = 13 TeV. Resonance candidates are reconstructed as large-radius jets and identified using a state-of-the-art jet tagging algorithm. This analysis presents the most sensitive limits for new spin-1 bosons coupling universally to quarks and spin-0 bosons coupling preferentially to heavier quarks. The invariant jet mass spectrum is probed for a potential narrow peaking signal over a smoothly falling background. Upper limits at 95% confidence level are set on the coupling of narrow resonances to quarks as a function of the resonance mass. For masses between 50 and 300 GeV, these are the most sensitive limits to date on all possible mediators. Using conventions on s-channel dark matter mediators, limits are set on dark photons and dark matter in the context of the relic density.","abstract_has_math":false,"creators":["Krupa, Jeffrey"],"institution":"Massachusetts Institute of Technology","degree_name":"Doctoral","degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. 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The invariant jet mass spectrum is probed for a potential narrow peaking signal over a smoothly falling background. Upper limits at 95% confidence level are set on the coupling of narrow resonances to quarks as a function of the resonance mass. For masses between 50 and 300 GeV, these are the most sensitive limits to date on all possible mediators. Using conventions on s-channel dark matter mediators, limits are set on dark photons and dark matter in the context of the relic density."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Ph.D."]},{"key":"dc:title","label":"Title","values":["Exploring New Frontiers in High Energy Physics: Boosted Resonances Decaying To Quarks, Foundation Models, and Heterogeneous Computing at the CMS Experiment"]}]}],"canonical_facts":{"dc:contributor.advisor":["Harris, Philip Coleman"],"dc:contributor.department":["Massachusetts Institute of Technology. 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