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Search for Dark Matter in the Upgraded High Luminosity LHC at CERN: Sensitivity of ATLAS phase II upgrade to dark matter production
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Sökandet efter mörk materia i den uppgraderade hög luminositets LHC i CERN : Känslighet för mörk materia produktion hos den fas II uppgraderade ATLAS (Swedish)
Abstract [en]

The LHC at CERN is now undergoing a set of upgrades to increase the center of mass energy for the colliding particles to be able to explore new physical processes. The focus of this thesis lies on the so called phase II upgrade which will preliminarily be completed in 2023. After the upgrade the LHC will be able to accelerate proton beams to such a velocity thateach proton has a center of mass energy of 14 TeV.

One disadvantage of the upgrade is that it will be harder for the atlas detector to isolate unique particle collisions since more and more collisions will occur simultaneously, so called pile-up.

For 14 TeV there does not exist a full simulation of the atlas detector. This thesis instead uses data from Monte Carlo simulations for the particle collisions and then uses so called smearing functions to emulate the detector responses.

This thesis focuses on how a mono-jet analysis looking for different wimp models of dark matter will be affected by this increase in pile-up rate.

The signal models which are in focus are those which try to explain dark matter without adding new theories to the standard model or QFT, such as the effective theory D5 operator and light vector mediator models.

The exclusion limits set for the D5 operators mass suppression scale at 14 TeV and 1000 fb-1are 2-3 times better than previous results at 8 TeV and 10 fb-1.

For the first time limits have been set on which vector mediator mass models can be excluded at 14 TeV.

Place, publisher, year, edition, pages
2014. , 79 p.
Keyword [en]
ATLAS, Beyond standard model physics, CERN, Dark matter, Effective operator, Elementary particle physics, High energy physics, Mono-jet analysis, Vector mediator, WIMPS
National Category
Subatomic Physics
URN: urn:nbn:se:liu:diva-107583ISRN: LITH-IFM-A-EX--14/2863--SEOAI: diva2:725662
External cooperation
Stockholms universitet
Subject / course
Applied Physics
Available from: 2014-06-18 Created: 2014-06-16 Last updated: 2014-06-18Bibliographically approved

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Hallsjö, Sven-Patrik
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