Change search
ReferencesLink to record
Permanent link

Direct link
Search for Direct Top Squark Pair Production with the ATLAS Experiment and Studies of the Primary Vertex Reconstruction Performance
Stockholm University, Faculty of Science, Department of Physics. (ATLAS)
2014 (English)Licentiate thesis, monograph (Other academic)
Abstract [en]

The ATLAS detector is one of the two largest experiments installed at the Large Hadron Collider at CERN, the European Organization for Nuclear Research. During the first run, the ATLAS detector recorded data at centre of mass energies of 7 TeV and 8 TeV, enabling many precision measurements and new physics searches. One important task in ATLAS is measuring the primary vertex, the interaction point of the hardest proton-proton collision in an event. In this thesis, a study of the primary vertex reconstruction performance in data and simulated events using $t\bar{t}$ and ${Z}$ events is presented. Within the statistics available, the performance in data and simulated events is found to be compatible. Motivated by the limitations of the Standard Model of particle physics, searches for supersymmetric particles are performed with the ATLAS experiment. No signal has been observed so far, and the results are used to set exclusion limits on the masses of the supersymmetric particles. As the exclusion limits are derived from analyses which each target only a single decay mode of a supersymmetric particle, the analyses might have lower sensitivity to more complex decay scenarios. In this thesis the sensitivity of one of the ATLAS searches for direct top squark pair production to models with more complex decay modes is investigated. The study concludes that the sensitivity to models where the top squark can decay via heavier charginos and neutralinos is lower than the sensitivity to models where only decays to the lightest chargino or neutralino are present.

Place, publisher, year, edition, pages
Stockholm University, 2014. , 97 p.
Keyword [en]
National Category
Subatomic Physics
URN: urn:nbn:se:su:diva-105746OAI: diva2:731279
2014-06-17, FB42, Fysikum, Stockholm, 11:41 (English)
Available from: 2014-07-01 Created: 2014-07-01 Last updated: 2014-07-01Bibliographically approved

Open Access in DiVA

fulltext(17371 kB)102 downloads
File information
File name FULLTEXT01.pdfFile size 17371 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Abulaiti, Yiming
By organisation
Department of Physics
Subatomic Physics

Search outside of DiVA

GoogleGoogle Scholar
Total: 102 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 164 hits
ReferencesLink to record
Permanent link

Direct link