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Studies of triggering and exotic particle searches at ATLAS, and a search for trapped monopoles
Stockholm University, Faculty of Science, Department of Physics. (Elementarpartikelfysik)
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The ATLAS detector at the LHC operated through 2011 and 2012 with 7 and 8 TeV centre-of-mass energy of its colliding proton bunches, respectively. One if its main objectives is to search for physics beyond the Standard Model. This thesis presents a study of a data-driven background method designed for long-lived heavy particles searches, where the signatures are allowed by for example R-parity violating Supersymmetry. Several studies of the perfor- mance of ATLAS trigger system have also been carried out. A contribution to a non-ATLAS search for primordial trapped magnetic monopoles was also undertaken. Data-taking and calibration of a SQUID magnetometer used when searching for magnetic monopoles in volcanic polar rocks were carried out. 

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University , 2013. , 158 p.
Keyword [en]
Magnetic monopoles, ATLAS, SQUID, trigger, exotic particles, heavy long-lived particles
National Category
Subatomic Physics
Research subject
High Energy Physics
URN: urn:nbn:se:su:diva-97789OAI: diva2:680160
2014-01-13, A4:1003, Roslagstullsbacken 21, Stockholm, 13:15 (English)
Available from: 2013-12-19 Created: 2013-12-17 Last updated: 2014-01-07Bibliographically approved
List of papers
1. Search for Magnetic Monopoles in Polar Volcanic Rocks
Open this publication in new window or tab >>Search for Magnetic Monopoles in Polar Volcanic Rocks
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2013 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 110, no 12, 121803Article in journal (Refereed) Published
Abstract [en]

For a broad range of values of magnetic monopole mass and charge, the abundance of monopoles trapped inside Earth would be expected to be enhanced in the mantle beneath the geomagnetic poles. A search for magnetic monopoles was conducted using the signature of an induced persistent current following the passage of igneous rock samples through a SQUID-based magnetometer. A total of 24.6 kg of rocks from various selected sites, among which 23.4 kg are mantle-derived rocks from the Arctic and Antarctic areas, was analyzed. No monopoles were found, and a 90% confidence level upper limit of 9.8 x 10(-5)/g is set on the monopole density in the search samples.

National Category
Physical Sciences
Research subject
urn:nbn:se:su:diva-89798 (URN)10.1103/PhysRevLett.110.121803 (DOI)000316682600002 ()


Available from: 2013-05-10 Created: 2013-05-08 Last updated: 2016-03-22Bibliographically approved

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Bendtz, Katarina
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