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Type: Journal article
Title: Search for metastable heavy charged particles with large ionisation energy loss in pp collisions at s√=8 TeV using the ATLAS experiment
Other Titles: Search for metastable heavy charged particles with large ionisation energy loss in pp collisions at s root=8 TeV using the ATLAS experiment
Author: ATLAS Collaboration
Aad, G.
Abbott, B.
Abdallah, J.
Abdinov, O.
Aben, R.
Abolins, M.
AbouZeid, O.
Abramowicz, H.
Abreu, H.
Abreu, R.
Abulaiti, Y.
Acharya, B.
Adamczyk, L.
Adams, D.
Adelman, J.
Adomeit, S.
Adye, T.
Affolder, A.
Agatonovic-Jovin, T.
et al.
Citation: The European Physical Journal C, 2015; 75(9):407-1-407-25
Publisher: Springer-Verlag
Issue Date: 2015
ISSN: 1434-6044
Statement of
G. Aad … P. Jackson … L. Lee ... A. Petridis... N. Soni … M. J. White … et al. (ATLAS collaboration)
Abstract: 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.
Keywords: ATLAS Collaboration; ATLAS Collaboration; ATLAS Collaboration
Description: Published online: 3 September 2015
Rights: © CERN for the benefit of the ATLAS collaboration 2015. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecomm, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
RMID: 0030035371
DOI: 10.1140/epjc/s10052-015-3609-0
Appears in Collections:Physics publications

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