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Search for Magnetic Monopoles in Polar Volcanic Rocks
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
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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.

Place, publisher, year, edition, pages
2013. Vol. 110, no 12, 121803
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-89798DOI: 10.1103/PhysRevLett.110.121803ISI: 000316682600002OAI: oai:DiVA.org:su-89798DiVA: diva2:620688
Note

AuthorCount:9;

Available from: 2013-05-10 Created: 2013-05-08 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Studies of triggering and exotic particle searches at ATLAS, and a search for trapped monopoles
Open this publication in new window or tab >>Studies of triggering and exotic particle searches at ATLAS, and a search for trapped monopoles
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
Magnetic monopoles, ATLAS, SQUID, trigger, exotic particles, heavy long-lived particles
National Category
Subatomic Physics
Research subject
High Energy Physics
Identifiers
urn:nbn:se:su:diva-97789 (URN)
Presentation
2014-01-13, A4:1003, Roslagstullsbacken 21, Stockholm, 13:15 (English)
Opponent
Supervisors
Available from: 2013-12-19 Created: 2013-12-17 Last updated: 2014-01-07Bibliographically approved
2. Searches for Massive Highly Ionising Particles at the ATLAS Experiment and in Polar Volcanic Rocks, and Performance Studies of the First Level ATLAS Trigger System
Open this publication in new window or tab >>Searches for Massive Highly Ionising Particles at the ATLAS Experiment and in Polar Volcanic Rocks, and Performance Studies of the First Level ATLAS Trigger System
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The Standard Model (SM) of particle physics describes the elementary particles and their interactions. Despite passing a number of high precision falsification tests, it is argued that the SM suffers from a number of shortcomings. Many Beyond the Standard Model (BSM) theories have therefore been postulated. Exotic highly ionising particles such as magnetic monopoles and Highly Electrically Charged Objects (HECOs), with masses at or above the TeV-scale, are predicted in many of these theories. Monopoles arise naturally in grand unification theories. Proposed candidates for HECOs are Q-balls, strangelets and micro-black hole remnants.

The Large Hadron Collider (LHC) at CERN is the world's largest and most powerful particle accelerator, colliding protons at centre-of-mass energies up to 13 TeV. One of the main purposes of the LHC is to search for particles beyond the SM. The research presented in this thesis comprises a search for magnetic monopoles and HECOs at one of the largest of the LHC detectors, the ATLAS detector. In addition, studies were made on the performance of the ATLAS trigger system, which is responsible for making the initial online selection of interesting proton-proton events.

The search for monopoles and HECOs at ATLAS was conducted using a customized trigger and selection variables optimized for the non-standard particle signature in ATLAS. The dataset corresponds to an integrated luminosity of 7.0 fb^{-1} and the centre-of-mass energy was 8 TeV. No events were observed and upper limits on production cross-sections were set for monopoles and HECOs of mass 200-2500 GeV and charge in the range $0.5-2.0$ g_D, where g_D is the Dirac charge, and 10 - 60 e, respectively.

Magnetic monopoles were also sought in polar volcanic rock using a SQUID magnetometer at ETH, Zürich. No candidates were found leading to limits on the monopole density in polar igneous rocks of 9.8 * 10^{-5}/gram.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2016. 259 p.
Keyword
Magnetiska monopoler, Trigger
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-127981 (URN)978-91-7649-293-2 (ISBN)
Public defence
2016-05-04, sal FP41, AlbaNova universitetscentrum, Roslagstullsbacken 33, Stockholm, 13:00 (English)
Opponent
Supervisors
Available from: 2016-04-11 Created: 2016-03-15 Last updated: 2017-02-17Bibliographically approved

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