Search for metastable heavy charged particles with large ionization energy loss in pp collisions at s =13 TeV using the ATLAS experiment

(ATLAS Collaboration)

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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.

Original languageEnglish
Article number112015
JournalPhysical Review D
Volume93
Issue number11
DOIs
StatePublished - 28 Jun 2016

Funding

FundersFunder number
Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)
Stichting voor Fundamenteel Onderzoek der Materie
Agence Nationale de la Recherche
Australian Research Council
Centre National pour la Recherche Scientifique et Technique
Fundação para a Ciência e a Tecnologia
Comisión Nacional de Investigación Científica y Tecnológica
Narodowe Centrum Nauki
H2020 Marie Skłodowska-Curie Actions
CEA-DSM
Japan Society for the Promotion of Science
MIZ
INFN-CNAF
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Ministry of Science and Technology, Taiwan
Israel Science Foundation
Wallenberg Foundation
Leverhulme Trust
Arizona-Nevada Academy of Science
Javna Agencija za Raziskovalno Dejavnost RS
Generalitat de Catalunya, Generalitat Valenciana
Arkansas Space Grant Consortium
Instituto Nazionale di Fisica Nucleare
Bundesministerium für Wissenschaft, Forschung und Wirtschaft
Austrian Science Fund
Department of Science and Technology, Ministry of Science and Technology, India
MSMT
MSSR
Ministerio de Economía y Competitividad
Bundesministerium für Bildung und Forschung
Canada Foundation for Innovation
Helmholtz-Gemeinschaft
Danmarks Grundforskningsfond
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Czech Republic
Singapore Eye Research Institute
Karlsruhe Institute of Technology
Canarie
GridKA
Ontario Innovation Trust
Georgian National Science Foundation
Deutsche Forschungsgemeinschaft
Ragion Auvergne
United States-Israel Binational Science Foundation
European Commission
Neurosurgical Research Foundation
MESTD
U.S. Department of Energy
EU-ESF
RGC
Fundação de Amparo à Pesquisa do Estado de São Paulo
Israeli Centers for Research Excellence
Biomedical Research Foundation
MES of Russia
National Research Center "Kurchatov Institute"
Institutul de Fizică Atomică
Natural Sciences and Engineering Research Council of Canada
General Secretariat for Research and Technology
Nella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of Science
Fonds Québécois de la Recherche sur la Nature et les Technologies
Cantons of Bern and Geneva
Canada Council for the Arts
Chinese Academy of Sciences
VSC CR
Glycemic Index Foundation
CRC Health Group
Compute Canada
MNE
Agencia Nacional de Promoción Científica y Tecnológica
Royal Society
Minerva Foundation
European Research Council
Ministerstwo Nauki i Szkolnictwa Wyższego
IRFU
CERN
Joint Institute for Nuclear Research
Fondation Partager le Savoir
National Research Council Canada
Brookhaven National Laboratory
Alexander von Humboldt-Stiftung
Council on grants of the President of the Russian Federation
Horizon 2020
British Columbia Knowledge Development Fund
Ministry of Education, Culture, Sports, Science and Technology
National Natural Science Foundation of China
Science and Technology Facilities CouncilST/J005533/1, ST/M000753/1, ST/N000307/1, ST/N000331/1, ST/L003449/1, GRIDPP, ST/L006162/1, ST/J004804/1, PP/E000444/1, ST/N000463/1, ST/K001329/1, ST/N000277/1, ST/L000997/1
NDGFCC-IN2P3
Seventh Framework Programme246806
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung163402, 156083
Horizon 2020 Framework Programme643410
National Science Foundation1119200, 1410972
DNSRCIN2P3-CNRS

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