Measurement of the mass difference between top and anti-top quarks in pp collisions at √s=7 TeV using the ATLAS detector

ATLAS Collaboration

doi:10.1016/j.physletb.2013.12.010

Measurement of the mass difference between top and anti-top quarks in pp collisions at √s=7 TeV using the ATLAS detector

ATLAS Collaboration

Fakultät für Mathematik und Physik
University of Freiburg
Physikalisches Institut
University Bonn
Homer L. Dodge Department of Physics and Astronomy
University of Oklahoma
University of São Paulo
Laboratoire de l'Accélérateur Linéaire
Azerbaijan Academy of Sciences
University of Amsterdam
Department of Physics
Oklahoma State University
Department of Physics and Astronomy
Michigan State University
Department of Physics
University of Toronto
Raymond and Beverly Sackler School of Physics and Astronomy
Tel Aviv University
Universite Paris-Saclay
Department of Physics
Stockholm University
Oskar Klein Centre
INFN Sezione di Trieste
Abdus Salam International Centre for Theoretical Physics
King's College London
Faculty of Physics and Applied Computer Science
Agh University of Science and Technology Faculty of Computer Science
Physics Department
Brookhaven National Laboratory
Department of Physics
Hampton University
Yale University
Fakultät für Physik
Universität München
Rutherford Appleton Laboratory
Department of Physics
Brandeis University
University of Belgrade
LIP - Lisboa
Departamento de Fisica Teorica y Del Cosmos
University of Granada
Albert Einstein Center for Fundamental Physics
University of Bern
Boston University
Departments of Physics & Astronomy and Chemistry
Stony Brook University
Joint Institute for Nuclear Research, Dubna
Physics Department
University of Texas
INFN Roma Tor Vergata
Dipartimento di Fisica
University of Rome “Tor Vergata”
Lund University
International Center for Elementary Particle Physics
University of Tokyo
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
Department of Physics
Royal Holloway University of London
Department of Physics and Astronomy
University of Victoria
Laboratoire de Physique Subatomique et de Cosmologie de Grenoble
Instituto de Física La Plata
European Organization for Nuclear Research
Sezione INFN di Milano
Horia Hulubei National Institute of Physics and Nuclear Engineering
Section de Physique
University of Geneva
Physics Department
National Technical University of Athens
Dipartimento di Chimica
and Physics University of Udine
Department of Physics
Humboldt-Universität zu Berlin
Universités Paris VI and VII
University of Cambridge
Université Savoie Mont Blanc

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

18 Citations (Scopus)

Abstract

A measurement of the mass difference between top and anti-top quarks is presented. In a 4.7 fb⁻¹ data sample of proton–proton collisions at s=7 TeV recorded with the ATLAS detector at the LHC, events consistent with tt¯ production and decay into a single charged lepton final state are reconstructed. For each event, the mass difference between the top and anti-top quark candidate is calculated. A two b-tag requirement is used in order to reduce the background contribution. A maximum likelihood fit to these per-event mass differences yields Δm≡m_t−m_t¯=0.67±0.61(stat)±0.41(syst) GeV, consistent with CPT invariance.

Original language	English
Pages (from-to)	363-379
Number of pages	17
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	728
DOIs	https://doi.org/10.1016/j.physletb.2013.12.010
Publication status	Published - 20 Jan 2014
Externally published	Yes

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10.1016/j.physletb.2013.12.010

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@article{16918ce4ce5b4700873b86614c1b5263,

title = "Measurement of the mass difference between top and anti-top quarks in pp collisions at √s=7 TeV using the ATLAS detector",

abstract = "A measurement of the mass difference between top and anti-top quarks is presented. In a 4.7 fb−1 data sample of proton{\textendash}proton collisions at s=7 TeV recorded with the ATLAS detector at the LHC, events consistent with tt¯ production and decay into a single charged lepton final state are reconstructed. For each event, the mass difference between the top and anti-top quark candidate is calculated. A two b-tag requirement is used in order to reduce the background contribution. A maximum likelihood fit to these per-event mass differences yields Δm≡mt−mt¯=0.67±0.61(stat)±0.41(syst) GeV, consistent with CPT invariance.",

author = "\{ATLAS Collaboration\} and G. Aad and T. Abajyan 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 Y. Abulaiti and Acharya, \{B. S.\} and L. Adamczyk and Adams, \{D. L.\} and Addy, \{T. N.\} and J. Adelman and S. Adomeit and T. Adye and S. Aefsky and T. Agatonovic-Jovin and Aguilar-Saavedra, \{J. A.\} and M. Agustoni and Ahlen, \{S. P.\} and A. Ahmad and F. Ahmadov and M. Ahsan and G. Aielli and {\AA}kesson, \{T. P.A.\} and G. Akimoto and Akimov, \{A. V.\} and Alam, \{M. A.\} and J. Albert and S. Albrand and \{Alconada Verzini\}, \{M. J.\} and M. Aleksa and Aleksandrov, \{I. N.\} and F. Alessandria and C. Alexa and G. Alexander and G. Alexandre and T. Alexopoulos and M. Alhroob and M. Aliev and O. Davignon and \{De La Taille\}, C. and T. Mueller and Sauvan, \{J. B.\} and O. Simard",

note = "Publisher Copyright: {\textcopyright} 2013 The Authors",

year = "2014",

month = jan,

day = "20",

doi = "10.1016/j.physletb.2013.12.010",

language = "English",

volume = "728",

pages = "363--379",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Measurement of the mass difference between top and anti-top quarks in pp collisions at √s=7 TeV using the ATLAS detector

AU - ATLAS Collaboration

AU - Aad, G.

AU - Abajyan, T.

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 - Abulaiti, Y.

AU - Acharya, B. S.

AU - Adamczyk, L.

AU - Adams, D. L.

AU - Addy, T. N.

AU - Adelman, J.

AU - Adomeit, S.

AU - Adye, T.

AU - Aefsky, S.

AU - Agatonovic-Jovin, T.

AU - Aguilar-Saavedra, J. A.

AU - Agustoni, M.

AU - Ahlen, S. P.

AU - Ahmad, A.

AU - Ahmadov, F.

AU - Ahsan, M.

AU - Aielli, G.

AU - Åkesson, T. P.A.

AU - Akimoto, G.

AU - Akimov, A. V.

AU - Alam, M. A.

AU - Albert, J.

AU - Albrand, S.

AU - Alconada Verzini, M. J.

AU - Aleksa, M.

AU - Aleksandrov, I. N.

AU - Alessandria, F.

AU - Alexa, C.

AU - Alexander, G.

AU - Alexandre, G.

AU - Alexopoulos, T.

AU - Alhroob, M.

AU - Aliev, M.

AU - Davignon, O.

AU - De La Taille, C.

AU - Mueller, T.

AU - Sauvan, J. B.

AU - Simard, O.

PY - 2014/1/20

Y1 - 2014/1/20

N2 - A measurement of the mass difference between top and anti-top quarks is presented. In a 4.7 fb−1 data sample of proton–proton collisions at s=7 TeV recorded with the ATLAS detector at the LHC, events consistent with tt¯ production and decay into a single charged lepton final state are reconstructed. For each event, the mass difference between the top and anti-top quark candidate is calculated. A two b-tag requirement is used in order to reduce the background contribution. A maximum likelihood fit to these per-event mass differences yields Δm≡mt−mt¯=0.67±0.61(stat)±0.41(syst) GeV, consistent with CPT invariance.

AB - A measurement of the mass difference between top and anti-top quarks is presented. In a 4.7 fb−1 data sample of proton–proton collisions at s=7 TeV recorded with the ATLAS detector at the LHC, events consistent with tt¯ production and decay into a single charged lepton final state are reconstructed. For each event, the mass difference between the top and anti-top quark candidate is calculated. A two b-tag requirement is used in order to reduce the background contribution. A maximum likelihood fit to these per-event mass differences yields Δm≡mt−mt¯=0.67±0.61(stat)±0.41(syst) GeV, consistent with CPT invariance.

U2 - 10.1016/j.physletb.2013.12.010

DO - 10.1016/j.physletb.2013.12.010

M3 - Article

AN - SCOPUS:85042515656

SN - 0370-2693

VL - 728

SP - 363

EP - 379

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

Measurement of the mass difference between top and anti-top quarks in pp collisions at √s=7 TeV using the ATLAS detector

Abstract

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