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
University of Oklahoma
Academia Sinica, Institute Of Physics
Laboratoire de l'Accélérateur Linéaire
Azerbaijan Academy of Sciences
University of Amsterdam
Oklahoma State University
Michigan State University
University of Toronto
Tel Aviv University
Technion - Israel Institute of Technology
European Organization for Nuclear Research
Stockholm University
Oskar Klein Centre
INFN Sezione di Trieste
Abdus Salam International Centre for Theoretical Physics
King's College London
Agh University of Science and Technology Faculty of Computer Science
Brookhaven National Laboratory
Northern Illinois University
Universität München
Rutherford Appleton Laboratory
University of Belgrade
Lisboa
University of Granada
Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa
University of Bern
Boston University
Joint Institute for Nuclear Research, Dubna
INFN Roma Tor Vergata
University of Rome “Tor Vergata”
Lund University
University of Tokyo
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
INFN Sezione di Bologna
University of Bologna
University of Victoria
LTHE (UMR 5564 CNRS/IRD/Université de Grenoble)
Instituto de Física La Plata
Horia Hulubei National Institute of Physics and Nuclear Engineering
University of Geneva
National Technical University of Athens
Sezione INFN di Milano
University of Chicago
University of Birmingham
Lancaster University
University of Liverpool
INFN Sezione di Napoli
University of Naples Federico II
Universités Paris VI and VII
University of Cambridge
Université Savoie Mont Blanc
Niels Bohr Institutet
Queen Mary University of London
Columbia University
High Energy Accelerator Research Organization (KEK)
Instituto de Biofisica da UFRJ
Brandeis University
University of Michigan, Ann Arbor
University of Coimbra
Faculdade de Ciências, Universidade de Lisboa
University of Freiburg
The University of Sheffield
University of Heidelberg
University of Milano
University of Athens
Technical University Dresden
Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
Novosibirsk State University
University of São Paulo
LNF-INFN
National Research Nuclear University MEPhI
Institute of Experimental Physics Slovak Academy of Sciences
Sezione di Roma
Duke University
Universite de Montreal
c/o DESY
Bogazici University
Universidad Autónoma de Madrid
University Bonn
Institute for Theoretical and Experimental Physics
University of Sussex
Comenius University
University of Illinois
Universität Siegen
Argonne National Laboratory
Czech Technical University in Prague
University of Johannesburg
University of California, Berkeley
TRIUMF
University Roma Tre
Universite Paris-Saclay
Aristotle University of Thessaloniki
University of Rome
Institute of High Energy Physics, Chinese Academy of Sciences
Yale University
Charles University
University of Manchester
Institute for Nuclear Physics
University of Wisconsin-Madison
Bergische Universität Gesamthochschule Wuppertal
Weizmann Institute of Science Israel
University of Melbourne
Sezione di Genova
University of Genoa
Max-Planck-Institut für Physik
Stanford Linear Accelerator Center
University of Oxford
Harvard University
University of Glasgow
University of California at Santa Cruz
California State University, Fresno
New York University
Tufts University
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
University of Pisa
University of Fribourg
University of Warwick
Gaziantep University
Stony Brook University
McGill University
Carleton University
UMass Amherst
Université Hassan II
York University
Uppsala University
Royal Holloway University of London
Johannes Gutenberg University
Radboud University
University of Edinburgh
University of Pittsburgh
University College London
Georg-August-Universität Göttingen
University of Sydney
University of Washington
B. I. Stepanov Institute of Physics
Moscow State University
Kurchatov Institute
The Chinese University of Hong Kong
University of Hong Kong
State University of New York Albany
Clermont-Auvergne University
Université Mohamed Premier
University of Texas at Arlington
Tokyo Metropolitan University
University of Oregon
and Physics University of Udine
University of Pennsylvania School of Arts and Sciences
University of the Witwatersrand, Johannesburg
Universidad Técnica Federico Santa María
Indiana University Bloomington
University of Bergen
Simon Fraser University
University of Oslo
University of Dortmund
University of Alberta
University of Valencia
Ankara University
Southern Methodist University
University of Calabria
Pontificia Universidad Católica de Chile
Federal University of Juiz de Fora (UFJF)
Dogus University
Tomsk State University
Iowa State University
Shandong University
Nanjing University
Tsinghua University
Kobe University
Faculté des Sciences Rabat
University of Arizona
Sezione di Lecce
Institute of Physics of the Czech Academy of Sciences
Palacky University Olomouc
University of Ljubljana
INFN Sezione di Pavia
University of Pavia
Università di Napoli Parthenope
Institute of Particle Physics
Long Beach VA and University of California
University of British Columbia
Humboldt-Universität zu Berlin
Tbilisi State University
Federal University of Sao Joao del Rei (UFSJ)
University of São Paulo
Justus-Liebig-Universität Giessen
Cadi Ayyad University
Osaka University
Petersburg Nuclear Physics Institute (PNPI)
St. Petersburg State Polytechnical University
The Ohio State University
University of Science and Technology of China
Centre National de l'Energie des Sciences Techniques Nucleaires
Medical University of Innsbruck
Centro de Física Nuclear da Universidade de Lisboa
University of New Mexico
University of Salento
Louisiana Tech University
Pompeu Fabra University (UPF)
Yerevan Physics Institute
University of Cape Town
University of Tsukuba
Nagoya University
Shinshu University
Tokyo Institute of Technology
National Centre for Particle and High Energy Physics
Waseda University
National Institute of Science Education and Research
Kyoto University
University of Texas
The University of Adelaide
Tbilisi State University
Ilia State University (ISU)
KTH Royal Institute of Technology
Kyushu University
Ochanomizu University
Manhattan College
Istanbul Aydin University
University of Würzburg
Shanghai Jiao Tong University
Universidad Antonio Narino
University of Iowa
University of Belgrade
Hampton University
Moscow Institute of Physics and Technology
Hiroshima Institute of Technology
Okayama University
Universidade de Minho
The University of Texas at Austin
Universidad de Buenos Aires
Jagiellonian University
International School of Advanced Studies
National Institute for Research and Development of Isotopic and Molecular Technologies
University 'Politehnica' of Bucharest
West University in Timisoara
The Hong Kong University of Science and Technology
University of South Carolina
Université Paris-Sud
Sun Yat-Sen University
Nagasaki Institute of Applied Science
TOBB University of Economics and Technology
Kyoto University of Education
Ritsumeikan University Biwako-Kusatsu Campus
Massachusetts Institute of Technology
Wigner Research Centre for Physics
Universität Hamburg
University of KwaZulu-Natal
Gazi University
University Malaya

Résultats de recherche: Contribution à un journal › Article › Revue par des pairs

103 Citations (Scopus)

Résumé

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.

langue originale	Anglais
Numéro d'article	142001
journal	Physical Review Letters
Volume	114
Numéro de publication	14
Les DOIs	https://doi.org/10.1103/PhysRevLett.114.142001
état	Publié - 8 avr. 2015
Modification externe	Oui

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10.1103/PhysRevLett.114.142001

Contient cette citation

@article{1519d57aac424f7bb6b88de85c71706e,

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 O. Davignon and T. Mueller and O. Simard",

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

year = "2015",

month = apr,

day = "8",

doi = "10.1103/PhysRevLett.114.142001",

language = "English",

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 - Davignon, O.

AU - Mueller, T.

AU - Simard, O.

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.

U2 - 10.1103/PhysRevLett.114.142001

DO - 10.1103/PhysRevLett.114.142001

M3 - Article

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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