Search for heavy, long-lived, charged particles with large ionisation energy loss in pp collisions at √s = 13 TeV using the ATLAS experiment and the full Run 2 dataset
| dc.contributor.advisor | Jeanty, Laura | |
| dc.contributor.author | Glisic, Marija | |
| dc.date.accessioned | 2025-02-24T19:06:31Z | |
| dc.date.available | 2025-02-24T19:06:31Z | |
| dc.date.issued | 2025-02-24 | |
| dc.description.abstract | Long-lived Supersymmetric particles offer an exciting sector of BSM physics that is not fully explored, but could be produced at the Large Hadron Collider (LHC) in proton-proton collisions of √s = 13 TeV. This thesis describes the search for long-lived sleptons using a highly-ionizing ditrack signature. It is a continuation of a previous search which used a single track and targeted long-lived R-hadrons and charginos. The ditrack selection has greater sensitivity for pair-produced staus with lifetimes of 10 ns or longer. The staus would present as high-momentum tracks with high ionization energy relative to the minimum-ionizing SM particles of similar momenta, and are detectable, using ATLAS’s Pixel Detector to measure ionization energy loss. These massive particles do not have simple SM backgrounds which can be easily simulated, but rather can be mimicked by detector effects and mis-reconstructions. As such, a data-driven method is formed to estimate the background. This analysis utilized the full ATLAS Run 2 dataset with integrated luminosity of 139 fb−1, and did not observe an excess of events which would indicate a discovery of long-lived staus. For meta-stable lifetimes of 3, 10, and 30 ns, long-lived staus of masses less than 420, 615, and 620 GeV were excluded at 95% confidence level, and stable staus were excluded for rest masses less than 520 GeV. This dissertation contains yet unpublished material. | en_US |
| dc.identifier.uri | https://hdl.handle.net/1794/30438 | |
| dc.language.iso | en_US | |
| dc.publisher | University of Oregon | |
| dc.rights | All Rights Reserved. | |
| dc.title | Search for heavy, long-lived, charged particles with large ionisation energy loss in pp collisions at √s = 13 TeV using the ATLAS experiment and the full Run 2 dataset | |
| dc.type | Electronic Thesis or Dissertation | |
| thesis.degree.discipline | Department of Physics | |
| thesis.degree.grantor | University of Oregon | |
| thesis.degree.level | doctoral | |
| thesis.degree.name | Ph.D. |
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