Measurement of the correlation between the polar angles of leptons from top quark decays in the helicity basis at s =7 T e V using the ATLAS detector

(ATLAS Collaboration)

doi:10.1103/PhysRevD.93.012002

Measurement of the correlation between the polar angles of leptons from top quark decays in the helicity basis at s =7 T e V using the ATLAS detector

(ATLAS Collaboration)

Aix-Marseille Université
University of Oklahoma
Academia Sinica Taipei
Azerbaijan Academy of Sciences
University of Amsterdam
Michigan State University
University of Toronto
Tel Aviv University
Technion - Israel Institute of Technology
University of Oregon
Stockholm University
Oskar Klein Centre
INFN- Sezione di Trieste
ICTP
King's College London
Univ of Mining and Metallurgy
Brookhaven National Laboratory
USA
University of Munich
Rutherford Appleton Laboratory
University of Liverpool
University of Belgrade
Georg August Universität Göttingen
Laboratório de Instrumentacão e Física Experimental de Partículas
University of Granada
New University of Lisbon
Boston University
Joint Inst. for Nuclear Research
INFN Sezione di Roma Tor Vergata
University of Rome Tor Vergata
Lund University
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
DIBINEM, Alma Mater Studiorum, University of Bologna
University of Victoria
University of Grenoble Alpes
Universidad Nacional de la Plata
European Organization for Nuclear Research
Horia Hulubei National Institute of Physics and Nuclear Engineering
National Technical University of Athens
INFN Sezione di Milano
University of Chicago
Columbia University
University of Sussex
University of Birmingham
INFN Sezione di Napoli
Università di Napoli Federico II
Niels Bohr Institutet
University of Washington
New York University
University of Valencia
Lawrence Berkeley National Laboratory
High Energy Accelerator Research Organization (KEK)
Federal University of Rio de Janeiro
Brandeis University
University of Michigan, Ann Arbor
University of Coimbra
University of Lisboa
University of Freiburg
University of Sheffield
University of Geneva
Heidelberg University
University of Milan
University of Athens
Technische Universität Dresden
Budker Institute of Nuclear Physics (SB RAS)
Novosibirsk State University
Universitat Autònoma de Barcelona
SNS and INFN
University of Pisa
Transilvania University of Brasov
INFN, Laboratori Nazionali Di Frascati
National Research Nuclear University MEPhI
Institute of Physics of the Slovak Academy of Sciences
Sezione INFN di Roma La Sapienza
Duke University
Université de Montréal
Iowa University
Bogazici University
University of Cambridge
University of Bonn
ITEP
Johannes Gutenberg University
University of Tokyo
Deutsches Elektronen-Synchrotron (DESY)
West University in Timisoara
Comenius University
University of Illinois at Urbana-Champaign
University of Siegen
Czech Technical University in Prague
University of Johannesburg
Laboratoire de l'Accélérateur Linéaire
TRIUMF
Sez. di Roma Tre
Commissariat A l'Énergie Atomique et Aux Énergies Alternatives, Centre de Saclay, IRFU
Aristotle University of Thessaloniki
Universita La Sapienza
Institute of High Energy Physics Chinese Academy of Science
Yale University
Charles University
SUNY
University of Manchester
University of Pennsylvania School of Arts and Sciences
Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences
University of Wisconsin-Madison
University of Louisville
Bergische Universität Wuppertal
University of Melbourne
Sezione INFN di Genova
University of Genova
Max-Planck-Institut für Physik
Stanford University
Université de Savoie
University of Oxford
Universidad Autónoma de Madrid
Department of Physics, Lancaster University
National Research Centre "Kurchatov Institute"
University of Glasgow
University of California at Santa Cruz
California State University Fresno
Ohio State University
Université Pierre et Marie Curie
Tufts University
University of Bern
University of Fribourg
University of Warwick
University of Gaziantep
McGill University and Génome Québec Innovation Centre
Carleton University
University of Massachusetts Amherst
Hassan II University of Casablanca
York University
Uppsala University
University of London
Queen Mary University of London
University of Pittsburgh
Humboldt-Universität zu Berlin
University of Sydney
Argonne National Laboratory
Pontificia Universidad Católica de Chile
Moscow State University
Institute for High Energy Physics (IHEP)
Chinese University of Hong Kong
University of Hong Kong
Hong Kong University of Science and Technology
University at Albany
Université Blaise Pascal
Oklahoma State University
University of Texas at Arlington
Tokyo Metropolitan University
Weizmann Institute of Science Israel
University of Edinburgh
Universidad Técnica Federico Santa María
University of Bergen
Simon Fraser University
University of Oslo
pro3dure medical GmbH
University of Alberta
University College London
Universite della Calabria
Ankara University School of Medicine
Shanghai Jiao Tong University
Southern Methodist University
Radboud University Nijmegen
University of California, Irvine
University of Cape Town
LIACC - Artificial Intelligence and Computer Science Laboratory
Broad Institute of Harvard University
Universidade Federal de Juiz de Fora
Dogus University
Tomsk State University
Iowa State University
Shandong University
Nanjing University
Tsinghua University
Kobe University
University Mohammed V in Rabat
University of Arizona
Istituto Nazionale di Fisica Nucleare, Sezione di Lecce
Indiana University Bloomington
Institute of Physics of the Czech Academy of Sciences
Palacky University
Univ. of Ljubljana
Univ.́ degli Studi di Udine
Istituto Nazionale di Fisica Nucleare, Sezione di Pavia
University of Pavia
Università di Napoli Parthenope
Institute of Particle Physics (IPP)
University of British Columbia
University Mohammed I
Tbilisi State University
Federal University of São João Del Rei
University of São Paulo
Justus-Liebig-Universität Gießen
Faculté Des Sciences-Semlalia
Osaka University
St. Petersburg Technical University
Nagasaki Institute of Applied Science
University of Science and Technology of China
National Center for Energy Sciences and Nuclear Techniques
Centro de Física Nuclear Universidade de Lisboa
University of New Mexico
University of Salento
Louisiana Tech University
Technology Department
A.I. Alikhanyan National Science Laboratory (YerPhi)
Tsukuba University
Natl. Academy of Sciences of Belarus
Shinshu University
Tokyo Institute of Technology
Nagoya University
National Scientific and Educational Centre for Particle and High Energy Physics
University of the Witwatersrand, Johannesburg
National Tsing Hua University
Waseda University
University of Texas at Austin
Kyoto University
University of Texas at Dallas
University of Adelaide
University of Innsbruck
Javakhishvili Tbilisi State University
Ilia State University (ISU)
Kyushu University
Georgian Technical University
Ochanomizu University
Manhattan College
Istanbul Aydin University (IAU)
University of Würzburg
Hellenic Open University
Universidad Antonio Nariño
Center for Autonomous Systems
Hampton University
Moscow Institute of Physics and Technology
Hiroshima Institute of Technology
Okayama University
Scuola Internazionale Superiore di Studi Avanzati
PT Government Associated Laboratory, University of Minho
University of Buenos Aires
Jagiellonian University
National Institute for R&D of Isotopic and Molecular Technologies
University Politehnica of Bucharest
University of South Carolina
CNRS/IN2P3 and Université Paris 11
Sun Yat-Sen University
TOBB University of Economics and Technology
Kyoto University of Education
Massachusetts Institute of Technology
Wigner Research Centre for Physics
University of Malaya

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Abstract

A measurement of the correlations between the polar angles of leptons from the decay of pair-produced t and t¯ quarks in the helicity basis is reported, using proton-proton collision data collected by the ATLAS detector at the LHC. The dataset corresponds to an integrated luminosity of 4.6 fb-1 at a center-of-mass energy of s=7 TeV collected during 2011. Candidate events are selected in the dilepton topology with large missing transverse momentum and at least two jets. The angles θ1 and θ2 between the charged leptons and the direction of motion of the parent quarks in the tt¯ rest frame are sensitive to the spin information, and the distribution of cosθ1·cosθ2 is sensitive to the spin correlation between the t and t¯ quarks. The distribution is unfolded to parton level and compared to the next-to-leading order prediction. A good agreement is observed.

Original language	English
Article number	012002
Journal	Physical Review D
Volume	93
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevD.93.012002
State	Published - 13 Jan 2016
Externally published	Yes

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10.1103/PhysRevD.93.012002

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@article{f5ca047e3a2341f583f410d01b908d4c,

title = "Measurement of the correlation between the polar angles of leptons from top quark decays in the helicity basis at s =7 T e V using the ATLAS detector",

abstract = "A measurement of the correlations between the polar angles of leptons from the decay of pair-produced t and t¯ quarks in the helicity basis is reported, using proton-proton collision data collected by the ATLAS detector at the LHC. The dataset corresponds to an integrated luminosity of 4.6 fb-1 at a center-of-mass energy of s=7 TeV collected during 2011. Candidate events are selected in the dilepton topology with large missing transverse momentum and at least two jets. The angles θ1 and θ2 between the charged leptons and the direction of motion of the parent quarks in the tt¯ rest frame are sensitive to the spin information, and the distribution of cosθ1·cosθ2 is sensitive to the spin correlation between the t and t¯ quarks. The distribution is unfolded to parton level and compared to the next-to-leading order prediction. A good agreement is observed.",

author = "\{(ATLAS Collaboration)\} and G. Aad and B. Abbott and J. Abdallah and O. Abdinov and R. Aben 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 Affolder, \{A. A.\} and T. Agatonovic-Jovin and J. Agricola and Aguilar-Saavedra, \{J. A.\} and Ahlen, \{S. P.\} and F. Ahmadov and G. Aielli and H. Akerstedt and {\AA}kesson, \{T. P.A.\} 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 T. Alexopoulos and M. Alhroob and G. Alimonti and L. Alio and J. Alison and Alkire, \{S. P.\} and Allbrooke, \{B. M.M.\} and Allport, \{P. P.\} and A. Aloisio and A. Alonso and F. Alonso and C. Alpigiani and A. Altheimer and \{Alvarez Gonzalez\}, B. and L. Heinrich",

note = "Publisher Copyright: {\textcopyright} 2016 CERN. {\textcopyright} 2016 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the »http://creativecommons.org/licenses/by/3.0/» 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.",

year = "2016",

month = jan,

day = "13",

doi = "10.1103/PhysRevD.93.012002",

language = "English",

volume = "93",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "1",

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TY - JOUR

T1 - Measurement of the correlation between the polar angles of leptons from top quark decays in the helicity basis at s =7 T e V using the ATLAS detector

AU - (ATLAS Collaboration)

AU - Aad, G.

AU - Abbott, B.

AU - Abdallah, J.

AU - Abdinov, O.

AU - Aben, R.

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 - Affolder, A. A.

AU - Agatonovic-Jovin, T.

AU - Agricola, J.

AU - Aguilar-Saavedra, J. A.

AU - Ahlen, S. P.

AU - Ahmadov, F.

AU - Aielli, G.

AU - Akerstedt, H.

AU - Åkesson, T. P.A.

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 - Alexopoulos, T.

AU - Alhroob, M.

AU - Alimonti, G.

AU - Alio, L.

AU - Alison, J.

AU - Alkire, S. P.

AU - Allbrooke, B. M.M.

AU - Allport, P. P.

AU - Aloisio, A.

AU - Alonso, A.

AU - Alonso, F.

AU - Alpigiani, C.

AU - Altheimer, A.

AU - Alvarez Gonzalez, B.

AU - Heinrich, L.

N1 - Publisher Copyright: © 2016 CERN. © 2016 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the »http://creativecommons.org/licenses/by/3.0/» 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.

PY - 2016/1/13

Y1 - 2016/1/13

N2 - A measurement of the correlations between the polar angles of leptons from the decay of pair-produced t and t¯ quarks in the helicity basis is reported, using proton-proton collision data collected by the ATLAS detector at the LHC. The dataset corresponds to an integrated luminosity of 4.6 fb-1 at a center-of-mass energy of s=7 TeV collected during 2011. Candidate events are selected in the dilepton topology with large missing transverse momentum and at least two jets. The angles θ1 and θ2 between the charged leptons and the direction of motion of the parent quarks in the tt¯ rest frame are sensitive to the spin information, and the distribution of cosθ1·cosθ2 is sensitive to the spin correlation between the t and t¯ quarks. The distribution is unfolded to parton level and compared to the next-to-leading order prediction. A good agreement is observed.

AB - A measurement of the correlations between the polar angles of leptons from the decay of pair-produced t and t¯ quarks in the helicity basis is reported, using proton-proton collision data collected by the ATLAS detector at the LHC. The dataset corresponds to an integrated luminosity of 4.6 fb-1 at a center-of-mass energy of s=7 TeV collected during 2011. Candidate events are selected in the dilepton topology with large missing transverse momentum and at least two jets. The angles θ1 and θ2 between the charged leptons and the direction of motion of the parent quarks in the tt¯ rest frame are sensitive to the spin information, and the distribution of cosθ1·cosθ2 is sensitive to the spin correlation between the t and t¯ quarks. The distribution is unfolded to parton level and compared to the next-to-leading order prediction. A good agreement is observed.

UR - https://www.scopus.com/pages/publications/84956625743

U2 - 10.1103/PhysRevD.93.012002

DO - 10.1103/PhysRevD.93.012002

M3 - Article

AN - SCOPUS:84956625743

SN - 2470-0010

VL - 93

JO - Physical Review D

JF - Physical Review D

IS - 1

M1 - 012002

ER -

Measurement of the correlation between the polar angles of leptons from top quark decays in the helicity basis at s =7 T e V using the ATLAS detector

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