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Search for metastable heavy charged particles with large ionisation energy loss in pp collisions at √s = 8 TeV using the ATLAS experiment

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Many extensions of the Standard Model predict the existence of charged heavy long-lived particles, such as R-hadrons or charginos. These particles, if produced at the Large Hadron Collider, should be moving non-relativistically and are therefore identifiable through the measurement of an anomalously...

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Main Authors: Aad, Georges (Author) , Anders, Christoph (Author) , Andrei, George Victor (Author) , Baas, Alessandra Edda (Author) , Brandt, Oleg (Author) , Djuvsland, Julia Isabell (Author) , Dunford, Monica (Author) , Geisler, Manuel Patrice (Author) , Hanke, Paul (Author) , Jongmanns, Jan (Author) , Kluge, Eike-Erik (Author) , Kugel, Andreas (Author) , Lang, Valerie (Author) , Lisovyi, Mykhailo (Author) , Meier, Karlheinz (Author) , Meyer zu Theenhausen, Hanno (Author) , Schätzel, Sebastian (Author) , Scharf, Veit (Author) , Schmitt, Sebastian (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Sosa Corral, David E. (Author) , Starovoitov, Pavel (Author) , Stamen, Rainer (Author) , Wessels, Martin (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 03 September 2015
In: The European physical journal. C, Particles and fields
Year: 2015, Volume: 75, Issue: 9, Pages: 1-25
ISSN:1434-6052
DOI:10.1140/epjc/s10052-015-3609-0
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1140/epjc/s10052-015-3609-0
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Author Notes:ATLAS Collaboration*
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Summary:Many extensions of the Standard Model predict the existence of charged heavy long-lived particles, such as R-hadrons or charginos. These particles, if produced at the Large Hadron Collider, should be moving non-relativistically and are therefore identifiable through the measurement of an anomalously large specific energy loss in the ATLAS pixel detector. Measuring heavy long-lived particles through their track parameters in the vicinity of the interaction vertex provides sensitivity to metastable particles with lifetimes from 0.6 ns to 30 ns. A search for such particles with the ATLAS detector at the Large Hadron Collider is presented, based on a data sample corresponding to an integrated luminosity of 18.4 fb−1 of pp collisions at s√=8 TeV. No significant deviation from the Standard Model background expectation is observed, and lifetime-dependent upper limits on R-hadrons and chargino production are set. Gluino R-hadrons with 10 ns lifetime and masses up to 1185 GeV are excluded at 95 % confidence level, and so are charginos with 15 ns lifetime and masses up to 482 GeV.
Item Description:*ATLAS Collaboration: G. Aad, C.F. Anders, V. Andrei, A. Baas, O. Brandt, M. Dunford, J.I. Djuvsland, M. Geisler, P. Hanke, J. Jongmanns, E.-E. Kluge, A. Kugel, V. Lang, M. Lisovyi, K. Meier, H. Meyer zu Theenhausen, S. Schaetzel, V. Scharf, S. Schmitt, A. Schoening, H.-C. Schultz-Coulon, D. Sosa, R. Stamen, P. Starovoitov, M. Wessels [und 2826 weitere Personen]
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Physical Description:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-015-3609-0

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