Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector

ATLAS Collaboration

doi:10.1103/PhysRevLett.114.142001

Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector

ATLAS Collaboration

Aix-Marseille Université and CNRS/IN2P3
University of Oklahoma
Academia Sinica - Institute of Physics
Université Paris-Sud and CNRS/IN2P3
Azerbaijan National Academy of Sciences
University of Amsterdam
Oklahoma State University
Michigan State University
University of Toronto
Tel Aviv University
Technion-Israel Institute of Technology
CERN
Stockholm University
The Oskar Klein Centre
National Institute for Nuclear Physics
Abdus Salam International Centre for Theoretical Physics
King's College London
AGH University of Krakow
Brookhaven National Laboratory
Northern Illinois University
Ludwig Maximilian University of Munich
Didcot
University of Belgrade
Laboratório de Instrumentação e Física Experimental de Partículas
University of Granada
NOVA University Lisbon
University of Bern
Boston University
Joint Institute for Nuclear Research
University of Rome Tor Vergata
Lund University
The University of Tokyo
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
University of Bologna
University of Victoria BC
Université Grenoble Alpes
Instituto de Física La Plata
Horia Hulubei National Institute of Physics and Nuclear Engineering
University of Geneva
National Technical University of Athens
The University of Chicago
University of Birmingham
Lancaster University
University of Liverpool
University of Naples Federico II
University of Copenhagen
Kobe University
Queen Mary University of London
Columbia University
High Energy Accelerator Research Organization, Tsukuba
Universidade Federal do Rio de Janeiro
Brandeis University
University of Michigan, Ann Arbor
University of Coimbra
University of Lisbon
University of Freiburg
University of Sheffield
Heidelberg University
University of Milan
National and Kapodistrian University of Athens
Technische Universität Dresden
Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
Novosibirsk State University
Autonomous University of Barcelona
Moscow Engineering Physics Institute
Slovak Academy of Sciences
Duke University
University of Montreal
German Electron Synchrotron
Bogazici University
Universidad Autónoma de Madrid
University of Cambridge
University of Bonn
Alikhanov Institute for Theoretical and Experimental Physics
University of Sussex
Comenius University
University of Illinois at Urbana-Champaign
University of Siegen
Argonne National Laboratory
Czech Technical University in Prague
University of Johannesburg
University of California at Berkeley
TRIUMF
Roma Tre University
CEA Saclay (Commissariat a lʼEnergie Atomique)
Aristotle University of Thessaloniki
University of Rome La Sapienza
CAS - Institute of High Energy Physics
Yale University
Charles University
University of Manchester
Polish Academy of Sciences
University of Wisconsin-Madison
University of Wuppertal
Weizmann Institute of Science
University of Melbourne
University of Genoa
Max Planck Institute for Physics (Werner Heisenberg Institute)
SLAC National Accelerator Laboratory
Université Savoie Mont Blanc
University of Oxford
Harvard University
University of Glasgow
University of California at Santa Cruz
California State University Fresno
New York University
Laboratoire de Physique Nucléaire et de Hautes Energies
Tufts University
University of Pisa
University of Fribourg
University of Warwick
Gaziantep University
Stony Brook University
McGill University
Carleton University
University of Massachusetts
University of Hassan II Casablanca
York University Toronto
Uppsala University
Royal Holloway University of London
Johannes Gutenberg University Mainz
Radboud University Nijmegen
University of Edinburgh
University of Pittsburgh
University College London
University of Göttingen
University of Sydney
University of Washington
Belarus Academy of Sciences
Lomonosov Moscow State University
Institute for High Energy Physics of National Research Centre ‘Kurchatov Institute’
Chinese University of Hong Kong
The University of Hong Kong
SUNY Albany
Université Clermont Auvergne
Mohamed I University
University of Texas at Arlington
Tokyo Metropolitan University
University of Oregon
University of Udine
University of Pennsylvania
University of the Witwatersrand
Universidad Técnica Federico Santa Maria
Indiana University Bloomington
University of Bergen
Simon Fraser University
University of Oslo
TU Dortmund University
University of Alberta
University of Valencia
Ankara University
Southern Methodist University
University of Calabria
Pontificia Universidad Católica de Chile
Universidade Federal de Juiz de Fora
Dogus University
Tomsk State University
Iowa State University
Shandong University
Nanjing University
Tsinghua University
Mohammed V University in Rabat
University of Arizona
Czech Academy of Sciences
Palacký University Olomouc
University of Ljubljana
University of Pavia
University of Naples Parthenope
Institute of Particle Physics
University of California at Irvine
University of British Columbia
Humboldt University of Berlin
Ivane Javakhishvili Tbilisi State University
Universidade Federal de São João del-Rei
Universidade de São Paulo
Justus Liebig University Giessen
Cadi Ayyad University
The University of Osaka
Petersburg Nuclear Physics Institute (PNPI)
Peter the Great St. Petersburg Polytechnic University
Ohio State University
University of Science and Technology of China
National Center for Energy, Nuclear Science and Technology
Innsbruck Medical University
University of New Mexico
University of Salento
Louisiana Tech University
ICREA
A. Alikhanian Yerevan Institute of Physics
University of Cape Town
University of Tsukuba
Nagoya University
Shinshu University
Institute of Science Tokyo
Belarusian State University
Waseda University
National Institute of Science Education and Research
Kyoto University
University of Texas at Dallas
Adelaide University
Ilia State University
KTH Royal Institute of Technology
Kyushu University
Ochanomizu University
Manhattan College
Istanbul Aydin University
University of Würzburg
Shanghai Jiao Tong University
Universidad Antonio Nariño
University of Iowa
Hampton University
Moscow Institute of Physics and Technology
Hiroshima Institute of Technology
Okayama University
University of Minho
University of Texas at Austin
Universidad de Buenos Aires
Jagiellonian University in Kraków
International School for Advanced Studies
National Institute for Research and Development of Isotopic and Molecular Technologies
National University of Science and Technology POLITEHNICA Bucharest
West University of Timisoara
Hong Kong University of Science and Technology
University of South Carolina
CNRS/IN2P3
Sun Yat-Sen University
Nagasaki Institute of Applied Science
TOBB University of Economics and Technology
Kyoto University of Education
Ritsumeikan University
Massachusetts Institute of Technology
Wigner Research Centre for Physics
University of Hamburg
University of KwaZulu-Natal
Gazi University
University of Malaya

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102 引用（Scopus）

摘要

A measurement of spin correlation in tt¯ production is presented using data collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb-1. The correlation between the top and antitop quark spins is extracted from dilepton tt¯ events by using the difference in the azimuthal angle between the two charged leptons in the laboratory frame. In the helicity basis the measured degree of correlation corresponds to Ahelicity=0.38±0.04, in agreement with the standard model prediction. A search is performed for pair production of top squarks with masses close to the top quark mass decaying to predominantly right-handed top quarks and a light neutralino, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 191 GeV are excluded at the 95% confidence level.

源语言	英语
文章编号	142001
期刊	Physical Review Letters
卷	114
期	14
DOI	https://doi.org/10.1103/PhysRevLett.114.142001
出版状态	已出版 - 8 4月 2015
已对外发布	是

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@article{6417159edb4d4f18b235421bbc658969,

title = "Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector",

abstract = "A measurement of spin correlation in tt¯ production is presented using data collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb-1. The correlation between the top and antitop quark spins is extracted from dilepton tt¯ events by using the difference in the azimuthal angle between the two charged leptons in the laboratory frame. In the helicity basis the measured degree of correlation corresponds to Ahelicity=0.38±0.04, in agreement with the standard model prediction. A search is performed for pair production of top squarks with masses close to the top quark mass decaying to predominantly right-handed top quarks and a light neutralino, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 191 GeV are excluded at the 95\% confidence level.",

author = "\{ATLAS Collaboration\} and G. Aad and B. Abbott and J. Abdallah and \{Abdel Khalek\}, S. and O. Abdinov and R. Aben and B. Abi and M. Abolins and Abouzeid, \{O. S.\} and H. Abramowicz and H. Abreu and R. Abreu and Y. Abulaiti and Acharya, \{B. S.\} and L. Adamczyk and Adams, \{D. L.\} and J. Adelman and S. Adomeit and T. Adye and T. Agatonovic-Jovin and Aguilar-Saavedra, \{J. A.\} and M. Agustoni and Ahlen, \{S. P.\} and F. Ahmadov and G. Aielli and H. Akerstedt and {\AA}kesson, \{T. P.A.\} and G. Akimoto and Akimov, \{A. V.\} and Alberghi, \{G. L.\} and J. Albert and S. Albrand and \{Alconada Verzini\}, \{M. J.\} and M. Aleksa and Aleksandrov, \{I. N.\} and C. Alexa and G. Alexander and G. Alexandre and T. Alexopoulos and M. Alhroob and G. Alimonti and L. Alio and J. Alison and Allbrooke, \{B. M.M.\} and Allison, \{L. J.\} and Allport, \{P. P.\} and A. Aloisio and A. Alonso and F. Alonso and L. Yuan",

note = "Publisher Copyright: {\textcopyright} 2015 CERN.",

year = "2015",

month = apr,

day = "8",

doi = "10.1103/PhysRevLett.114.142001",

language = "英语",

volume = "114",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "14",

}

TY - JOUR

T1 - Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector

AU - ATLAS Collaboration

AU - Aad, G.

AU - Abbott, B.

AU - Abdallah, J.

AU - Abdel Khalek, S.

AU - Abdinov, O.

AU - Aben, R.

AU - Abi, B.

AU - Abolins, M.

AU - Abouzeid, O. S.

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abreu, R.

AU - Abulaiti, Y.

AU - Acharya, B. S.

AU - Adamczyk, L.

AU - Adams, D. L.

AU - Adelman, J.

AU - Adomeit, S.

AU - Adye, T.

AU - Agatonovic-Jovin, T.

AU - Aguilar-Saavedra, J. A.

AU - Agustoni, M.

AU - Ahlen, S. P.

AU - Ahmadov, F.

AU - Aielli, G.

AU - Akerstedt, H.

AU - Åkesson, T. P.A.

AU - Akimoto, G.

AU - Akimov, A. V.

AU - Alberghi, G. L.

AU - Albert, J.

AU - Albrand, S.

AU - Alconada Verzini, M. J.

AU - Aleksa, M.

AU - Aleksandrov, I. N.

AU - Alexa, C.

AU - Alexander, G.

AU - Alexandre, G.

AU - Alexopoulos, T.

AU - Alhroob, M.

AU - Alimonti, G.

AU - Alio, L.

AU - Alison, J.

AU - Allbrooke, B. M.M.

AU - Allison, L. J.

AU - Allport, P. P.

AU - Aloisio, A.

AU - Alonso, A.

AU - Alonso, F.

AU - Yuan, L.

PY - 2015/4/8

Y1 - 2015/4/8

N2 - A measurement of spin correlation in tt¯ production is presented using data collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb-1. The correlation between the top and antitop quark spins is extracted from dilepton tt¯ events by using the difference in the azimuthal angle between the two charged leptons in the laboratory frame. In the helicity basis the measured degree of correlation corresponds to Ahelicity=0.38±0.04, in agreement with the standard model prediction. A search is performed for pair production of top squarks with masses close to the top quark mass decaying to predominantly right-handed top quarks and a light neutralino, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 191 GeV are excluded at the 95% confidence level.

AB - A measurement of spin correlation in tt¯ production is presented using data collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb-1. The correlation between the top and antitop quark spins is extracted from dilepton tt¯ events by using the difference in the azimuthal angle between the two charged leptons in the laboratory frame. In the helicity basis the measured degree of correlation corresponds to Ahelicity=0.38±0.04, in agreement with the standard model prediction. A search is performed for pair production of top squarks with masses close to the top quark mass decaying to predominantly right-handed top quarks and a light neutralino, the lightest supersymmetric particle. Top squarks with masses between the top quark mass and 191 GeV are excluded at the 95% confidence level.

UR - https://www.scopus.com/pages/publications/84979725823

U2 - 10.1103/PhysRevLett.114.142001

DO - 10.1103/PhysRevLett.114.142001

M3 - 文章

AN - SCOPUS:84979725823

SN - 0031-9007

VL - 114

JO - Physical Review Letters

JF - Physical Review Letters

IS - 14

M1 - 142001

ER -

Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in pp Collisions at √s =8 TeV Using the ATLAS Detector

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