Change search
ReferencesLink to record
Permanent link

Direct link
Calibration of b-tagging efficiency and search for Dark Matter production in association with heavy flavour quarks with the ATLAS experiment.
Stockholm University, Faculty of Science, Department of Physics. (ATLAS)ORCID iD: 0000-0002-5690-0521
2016 (English)Licentiate thesis, monograph (Other academic)
Abstract [en]

The Large Hadron Collider (LHC) is the most powerful and complex particle accelerator ever built. The ATLAS detector is a general-purpose particle detector at the LHC, designed to cover a wide range of physics measurements.This thesis presents two physics studies performed using data of proton-proton collisions collected with the ATLAS detector at √s = 8 TeV.

The identication of jets originating from b quarks (b-tagging) is a crucial tool for many physics analyses at the LHC. A new technique to calibrate the efficiency of b-tagging algorithms using high transverse momentum jets is described. This technique allows to perform the calibration using jets with transverse momenta up to 1200 GeV, while the current calibration methods only reach approximately 300 GeV. The results of the calibration are presented. 

The second study presented in this thesis is a search for Dark Matter (DM) production in association with a pair of heavy flavour quarks. A reinterpretation of the results of the ATLAS search for DM at √s = 8 TeV has been done based on simplied models. A set of simplied models with various DM masses, masses of the exchange particle, that mediates the interaction between DM and the regular matter, and couplings is considered. This study aims to choose benchmark models to be used in future searches at √s = 13 TeV.

Additionally an accomplished technical project on the development of the b-tagging ATLAS software is presented.

Place, publisher, year, edition, pages
Stockholm University, 2016. , 161 p.
Keyword [en]
ATLAS, b-tagging, calibration, Dark Matter, simplified model
National Category
Physical Sciences
Research subject
URN: urn:nbn:se:su:diva-129870OAI: diva2:930770
2016-05-23, FB54, Alba Nova, Stockholm, 13:00 (English)
Available from: 2016-05-25 Created: 2016-05-02 Last updated: 2016-05-25Bibliographically approved

Open Access in DiVA

fulltext(18670 kB)29 downloads
File information
File name FULLTEXT01.pdfFile size 18670 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Shcherbakova, Anna
By organisation
Department of Physics
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 29 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: 63 hits
ReferencesLink to record
Permanent link

Direct link