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Search for Massive Long-lived Highly Ionising Particles with the ATLAS detector at the LHC
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics.
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2011 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 698, no 5, 353-370 p.Article in journal (Refereed) Published
Abstract [en]

A search is made for massive highly ionising particles with lifetimes in excess of 100 ns, with the ATLAS experiment at the Large Hadron Collider, using 3.1 pb−1 of pp collision data taken at . The signature of energy loss in the ATLAS inner detector and electromagnetic calorimeter is used. No such particles are found and limits on the production cross section for electric charges 6e⩽|q|⩽17e and masses 200 GeV⩽m⩽1000 GeV are set in the range 1–12 pb for different hypotheses on the production mechanism.

Place, publisher, year, edition, pages
2011. Vol. 698, no 5, 353-370 p.
Keyword [en]
High-energy collider experiment, Long-lived particle, Highly ionising, New physics
National Category
Subatomic Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-62973DOI: 10.1016/j.physletb.2011.03.033ISI: 000290185500003OAI: oai:DiVA.org:su-62973DiVA: diva2:446212
Projects
Atlas
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note
Publikationen har totalt 3039 författare, G. Aad et al.Available from: 2011-10-06 Created: 2011-10-06 Last updated: 2017-12-08Bibliographically approved
In thesis
1. Searches for exotic stable massive particles with the ATLAS experiment
Open this publication in new window or tab >>Searches for exotic stable massive particles with the ATLAS experiment
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents two signature-based searches for exotic long-lived particles using experimental data collected by the ATLAS experiment at the Large Hadron Collider (LHC) at CERN. At the LHC, proton-proton collisions take place at the world-record center-of-mass energy of 7 TeV and luminosities of up to  3×1033 cm-2s-1 . New physics has long been anticipated at the LHC and in this thesis two searches for hitherto unobserved particles are presented.

Long-lived heavy hadrons have been predicted by models of supersymmetry, and these were the target of the first physics analysis. Using measurements of timing and energy loss, a search for so-called R-hadrons was performed. No excess was observed in the data, and new lower limits were established on the masses of meta-stable supersymmetric particles with color charge: mgluino > 562-586 GeV (depending on choice of scattering model), mstop > 309 GeV and msbottom > 294 GeV. These constraints are the most stringent limits published to date.

In addition, a ``blue-sky'' search was made for objects possessing high electric charge. Ionization energy loss measurements were combined with variables describing the shape of electromagnetic showers to separate the sought signal from background processes. No event in the experimental data passed the selection and the results are in agreement with a background-only hypothesis. Upper limits between 1-12 pb were computed for the production cross sections of particles with electric charge 6e ≤ |q| ≤ 17e and mass 200 ≤ m ≤ 1000 GeV. This is the first dedicated search for such particles at the LHC.

Finally, a system designed to monitor the LHC beams and timing signals based on beam pick-up detectors is described together with results from early LHC operation.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2011. 185 p.
Keyword
ATLAS, ATLAS experiment, supersymmetry, squark, gluino, stable massive particles, long-lived particles, physics analysis, search analysis, LHC, Large Hadron Collider
National Category
Subatomic Physics
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-63068 (URN)978-91-7447-341-4 (ISBN)
Public defence
2011-11-04, sal FB42, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 14:00 (English)
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Available from: 2011-10-13 Created: 2011-10-07 Last updated: 2011-10-10Bibliographically approved

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Åsman, BarbroBohm, ChristianClément, ChristopheEriksson, DanielGellerstedt, KarlHellman, StenHidvégi, AttilaJohansen, MarianneJohansson, ErikJon-And, KerstinLundberg, JohanMilstead, DavidMoa, TorbjörnNordkvist, BjörnOhm, ChristianPapadelis, ArasRamstedt, MagnusSilverstein, SamuelSjölin, JörgenStrandberg, SaraTylmad, MajaYang, ZhaoyuHolmgren, Sven-Olof
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