Search for decays of stopped long-lived particles produced in proton–proton collisions at √s= 8, TeV

CMS Collaboration

doi:10.1140/epjc/s10052-015-3367-z

Search for decays of stopped long-lived particles produced in proton–proton collisions at √s= 8, TeV

CMS Collaboration

Yerevan Physics Institute
Institut für Hochenergiephysik
Vienna University of Technology
European Organization for Nuclear Research
National Centre for Particle and High Energy Physics
University of Antwerp
Vrjie Universiteit Brussel
Université Libre de Bruxelles
Ghent University
University of Louvain
Université de Strasbourg
National Institute of Chemical Physics and Biophysics, Tallinn
Moscow State University
Université de Mons
Centro Brasileiro de Pesquisas Fisicas
Rua São Francisco de Xavier
University of Campinas (UNICAMP)
Federal University of ABC (UFABC)
São Paulo State University
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
University of Sofia
Institute of High Energy Physics, Chinese Academy of Sciences
Ip Paris
State Key Laboratory of Nuclear Physics and Technology
Universidad de Los Andes, Colombia
CSIC-Univ. Cantabria
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split
Faculty of Science, University of Split
Ruđer Bošković Institute
University of Cyprus
Charles University
Joint Institute for Nuclear Research, Dubna
Suez University
Egyptian Network of High Energy Physics
British University in Egypt
Fayoum University
Ain Shams University
Now at Sultan Qaboos University
University of Helsinki
Helsinki Institute of Physics
LUT University
Universite Paris-Saclay
Université de Haute Alsace
Université Paris-Sud
IGFL, Université de Lyon, Université Lyon 1
Tbilisi State University
RWTH Aachen University
c/o DESY
Joint Faculty of the Brandenburg University of Technology Cottbus Senftenberg
Universität Hamburg
Institute of Meteorology and Climate Research
NCSR Demokritos
University of Athens
University of Ioannina
Wigner Research Centre for Physics
Institute of Nuclear Research ATOMKI
Eötvös Loránd University
University of Debrecen
National Institute of Science Education and Research
Panjab University
University of Delhi
Saha Institute of Nuclear Physics
Bhabha Atomic Research Centre
Tata Institute of Fundamental Research, Mumbai
University of Visva-Bharati
King Abdulaziz University
University of Ruhuna
Institute for Research in Fundamental Sciences (IPM)
Isfahan University of Technology
University of Tehran
Islamic Azad University, Science and Research Branch
University College Dublin
INFN Sezione di Bari
Università degli studi di Bari Aldo Moro
Politecnico di Bari
INFN Sezione di Bologna
University of Bologna
INFN Sezione di Catania
Università degli Studi di Catania
CSFNSM
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
University of Florence
LNF-INFN
Sezione di Genova
University of Genoa
INFN Sezione di Milano-Bicocca
University of Milano-Bicocca
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Università degli Studi della Basilicata
Università G. Marconi (Roma)
University of Naples Federico II
INFN
University of Padova
Università di Trento
INFN Sezione di Pavia
University of Pavia
INFN Sezione di Perugia
University of Perugia
University of Siena
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Scuola Normale Superiore di Pisa
University of Pisa
Centre national de la recherche scientifique
Purdue University
Sezione di Roma
Università di Roma
INFN Sezione di Torino
University of Turin
Laboratory of Molecular Pathology
INFN Sezione di Trieste
University of Trieste
Kangwon National University
Kyungpook National University
Chonbuk National University
Chonnam National University
Korea University
Seoul National University
University of Seoul
Sungkyunkwan University
Vilnius University
University Malaya
CINVESTAV-IPN
Universidad Iberoamericana
Benemerita Universidad Autonoma de Puebla
Universidad Autónoma de San Luis Potosi
University of Auckland
University of Canterbury
Quaid-i-Azam University
National Centre for Nuclear Research
University of Warsaw
Lisboa
Institute for Nuclear Research of the Russian Academy of Sciences
Petersburg Nuclear Physics Institute (PNPI)
St. Petersburg State Polytechnical University
Institute for Theoretical and Experimental Physics
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
National Research Nuclear University MEPhI
Kurchatov Institute
University of Belgrade
University of Belgrade
Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT)
Universidad Autónoma de Madrid
University of Oviedo
University of Rome
Paul Scherrer Institut
ETH Zurich
University of Bern
University of Zurich
National Central University
National Taiwan University
Chulalongkorn University
Cukurova University
Gaziosmanpasa University
Adiyaman University
Cag University
Middle East Technical University (METU)
Anadolu University
Ozyegin University
Izmir Institute of Technology
Necmettin Erbakan University
Mimar Sinan University
Bogazici University
Marmara University
Kafkas University
Yildiz Technical University
Istanbul Technical University
Kharkov Institute of Physics and Technology
University of Bristol
CCLRC Rutherford Appleton Laboratory
University of Southampton
Imperial College London
Brunel University London
Baylor University
University of Alabama
Boston University
Women and Infants Hospital of Rhode Island-Warren Alpert Medical School of Brown University
University of California, Davis
University of California, Los Angeles
University of California, Riverside
University of California, San Diego
University of California, Santa Barbara
California Institute of Technology
Carnegie Mellon University
University of Colorado Boulder
Cornell University
Fairfield University
Fermi National Accelerator Laboratory
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Florida State University
Florida Institute of Technology
University of Illinois at Chicago
Argonne National Laboratory
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Vanderbilt University
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Wayne State University
University of Wisconsin-Madison

Research output: Contribution to journal › Article › peer-review

Abstract

A search has been performed for long-lived particles that could have come to rest within the CMS detector, using the time intervals between LHC beam crossings. The existence of such particles could be deduced from observation of their decays via energy deposits in the CMS calorimeter appearing at times that are well separated from any proton–proton collisions. Using a data set corresponding to an integrated luminosity of 18.6^-1 of 8 TeV proton–proton collisions, and a search interval corresponding to 281 h of trigger livetime, 10 events are observed, with a background prediction of 13_2-2.5 ^+3.6 events. Limits are presented at 95 % confidence level on gluino and top squark production, for over 13 orders of magnitude in the mean proper lifetime of the stopped particle. Assuming a cloud model of R-hadron interactions, a gluino with mass ≲1000 GeV and a top squark with mass ≲525 GeV are excluded, for lifetimes between 1 μs and 1000s. These results are the most stringent constraints on stopped particles to date.

Original language	English
Article number	151
Pages (from-to)	1-22
Number of pages	22
Journal	European Physical Journal C
Volume	75
Issue number	4
DOIs	https://doi.org/10.1140/epjc/s10052-015-3367-z
Publication status	Published - 1 Apr 2015

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10.1140/epjc/s10052-015-3367-z

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@article{5700d63a332544d4a043dba5484352da,

title = "Search for decays of stopped long-lived particles produced in proton–proton collisions at √s= 8, TeV",

abstract = "A search has been performed for long-lived particles that could have come to rest within the CMS detector, using the time intervals between LHC beam crossings. The existence of such particles could be deduced from observation of their decays via energy deposits in the CMS calorimeter appearing at times that are well separated from any proton–proton collisions. Using a data set corresponding to an integrated luminosity of 18.6-1 of 8 TeV proton–proton collisions, and a search interval corresponding to 281 h of trigger livetime, 10 events are observed, with a background prediction of 132-2.5 +3.6 events. Limits are presented at 95 \% confidence level on gluino and top squark production, for over 13 orders of magnitude in the mean proper lifetime of the stopped particle. Assuming a cloud model of R-hadron interactions, a gluino with mass ≲1000 GeV and a top squark with mass ≲525 GeV are excluded, for lifetimes between 1 μs and 1000s. These results are the most stringent constraints on stopped particles to date.",

author = "\{CMS Collaboration\} and V. Khachatryan and Sirunyan, \{A. M.\} and A. Tumasyan and W. Adam and T. Bergauer and M. Dragicevic and J. Er{\"o} and M. Friedl and R. Fr{\"u}hwirth and Ghete, \{V. M.\} and C. Hartl and N. H{\"o}rmann and J. Hrubec and M. Jeitler and W. Kiesenhofer and V. Kn{\"u}nz and M. Krammer and I. Kr{\"a}tschmer and D. Liko and I. Mikulec and D. Rabady and B. Rahbaran and H. Rohringer and R. Sch{\"o}fbeck and J. Strauss and W. Treberer-Treberspurg and W. Waltenberger and Wulz, \{C. E.\} and V. Mossolov and N. Shumeiko and \{Suarez Gonzalez\}, J. and S. Alderweireldt and S. Bansal and T. Cornelis and \{De Wolf\}, \{E. A.\} and X. Janssen and A. Knutsson and J. Lauwers and S. Luyckx and S. Ochesanu and R. Rougny and F. Beaudette and C. Charlot and \{Granier de Cassagnac\}, R. and M. Nguyen and C. Ochando and P. Paganini and Sauvan, \{J. B.\} and Y. Sirois and A. Zabi",

note = "Publisher Copyright: {\textcopyright} 2015, CERN for the benefit of the CMS collaboration.",

year = "2015",

month = apr,

day = "1",

doi = "10.1140/epjc/s10052-015-3367-z",

language = "English",

volume = "75",

pages = "1--22",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer Nature",

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TY - JOUR

T1 - Search for decays of stopped long-lived particles produced in proton–proton collisions at √s= 8, TeV

AU - CMS Collaboration

AU - Khachatryan, V.

AU - Sirunyan, A. M.

AU - Tumasyan, A.

AU - Adam, W.

AU - Bergauer, T.

AU - Dragicevic, M.

AU - Erö, J.

AU - Friedl, M.

AU - Frühwirth, R.

AU - Ghete, V. M.

AU - Hartl, C.

AU - Hörmann, N.

AU - Hrubec, J.

AU - Jeitler, M.

AU - Kiesenhofer, W.

AU - Knünz, V.

AU - Krammer, M.

AU - Krätschmer, I.

AU - Liko, D.

AU - Mikulec, I.

AU - Rabady, D.

AU - Rahbaran, B.

AU - Rohringer, H.

AU - Schöfbeck, R.

AU - Strauss, J.

AU - Treberer-Treberspurg, W.

AU - Waltenberger, W.

AU - Wulz, C. E.

AU - Mossolov, V.

AU - Shumeiko, N.

AU - Suarez Gonzalez, J.

AU - Alderweireldt, S.

AU - Bansal, S.

AU - Cornelis, T.

AU - De Wolf, E. A.

AU - Janssen, X.

AU - Knutsson, A.

AU - Lauwers, J.

AU - Luyckx, S.

AU - Ochesanu, S.

AU - Rougny, R.

AU - Beaudette, F.

AU - Charlot, C.

AU - Granier de Cassagnac, R.

AU - Nguyen, M.

AU - Ochando, C.

AU - Paganini, P.

AU - Sauvan, J. B.

AU - Sirois, Y.

AU - Zabi, A.

PY - 2015/4/1

Y1 - 2015/4/1

N2 - A search has been performed for long-lived particles that could have come to rest within the CMS detector, using the time intervals between LHC beam crossings. The existence of such particles could be deduced from observation of their decays via energy deposits in the CMS calorimeter appearing at times that are well separated from any proton–proton collisions. Using a data set corresponding to an integrated luminosity of 18.6-1 of 8 TeV proton–proton collisions, and a search interval corresponding to 281 h of trigger livetime, 10 events are observed, with a background prediction of 132-2.5 +3.6 events. Limits are presented at 95 % confidence level on gluino and top squark production, for over 13 orders of magnitude in the mean proper lifetime of the stopped particle. Assuming a cloud model of R-hadron interactions, a gluino with mass ≲1000 GeV and a top squark with mass ≲525 GeV are excluded, for lifetimes between 1 μs and 1000s. These results are the most stringent constraints on stopped particles to date.

AB - A search has been performed for long-lived particles that could have come to rest within the CMS detector, using the time intervals between LHC beam crossings. The existence of such particles could be deduced from observation of their decays via energy deposits in the CMS calorimeter appearing at times that are well separated from any proton–proton collisions. Using a data set corresponding to an integrated luminosity of 18.6-1 of 8 TeV proton–proton collisions, and a search interval corresponding to 281 h of trigger livetime, 10 events are observed, with a background prediction of 132-2.5 +3.6 events. Limits are presented at 95 % confidence level on gluino and top squark production, for over 13 orders of magnitude in the mean proper lifetime of the stopped particle. Assuming a cloud model of R-hadron interactions, a gluino with mass ≲1000 GeV and a top squark with mass ≲525 GeV are excluded, for lifetimes between 1 μs and 1000s. These results are the most stringent constraints on stopped particles to date.

U2 - 10.1140/epjc/s10052-015-3367-z

DO - 10.1140/epjc/s10052-015-3367-z

M3 - Article

AN - SCOPUS:84928470966

SN - 1434-6044

VL - 75

SP - 1

EP - 22

JO - European Physical Journal C

JF - European Physical Journal C

IS - 4

M1 - 151

ER -

Search for decays of stopped long-lived particles produced in proton–proton collisions at √s= 8, TeV

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