Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/102502
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Type: Journal article
Title: Search for metastable heavy charged particles with large ionization energy loss in pp collisions at √=13  TeV using the ATLAS experiment
Other Titles: Search for metastable heavy charged particles with large ionization energy loss in pp collisions at root=13TeV using the ATLAS experiment
Author: Aaboud, M.
ATLAS Collaboration
Aad, G.
Abbott, B.
Abdallah, J.
Abdinov, O.
Abeloos, B.
Aben, R.
Abouzeid, O.
Abraham, N.
Abramowicz, H.
Abreu, H.
Abreu, R.
Abulaiti, Y.
Acharya, B.
Adamczyk, L.
Adams, D.
Adelman, J.
Adomeit, S.
Adye, T.
et al.
Citation: Physical Review D - Particles, Fields, Gravitation and Cosmology, 2016; 93(11):112015-1-112015-25
Publisher: American Physical Society
Issue Date: 2016
ISSN: 1550-7998
1550-2368
Statement of
Responsibility: 
M. Aaboud ... P. Jackson ... L. Lee ... A. Petridis ... M. J. White ... et al. (ATLAS Collaboration)
Abstract: This paper presents a search for massive charged long-lived particles produced in pp collisions at s√=13  TeV at the LHC using the ATLAS experiment. The data set used corresponds to an integrated luminosity of 3.2  fb−1. Many extensions of the Standard Model predict the existence of massive charged long-lived particles, such as R-hadrons. These massive particles are expected to be produced with a velocity significantly below the speed of light, and therefore to have a specific ionization higher than any Standard Model particle of unit charge at high momenta. The Pixel subsystem of the ATLAS detector is used to measure the ionization energy loss of reconstructed charged particles and to search for such highly ionizing particles. The search presented here has much greater sensitivity than a similar search performed using the ATLAS detector in the s√=8  TeV data set, thanks to the increase in expected signal cross section due to the higher center-of-mass energy of collisions, to an upgraded detector with a new silicon layer close to the interaction point, and to analysis improvements. No significant deviation from Standard Model background expectations is observed, and lifetime-dependent upper limits on R-hadron production cross sections and masses are set. Gluino R-hadrons with lifetimes above 0.4 ns and decaying to qq¯ plus a 100 GeV neutralino are excluded at the 95% confidence level, with lower mass limit ranging between 740 and 1590 GeV. In the case of stable R-hadrons the lower mass limit at the 95% confidence level is 1570 GeV.
Description: Published 28 June 2016
Rights: © 2016 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
RMID: 0030057666
DOI: 10.1103/PhysRevD.93.112015
Appears in Collections:Physics publications

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