Search for the standard model higgs boson produced in association with top quarks and decaying into bb in pp collisions at √s = 8 TeV with the ATLAS detector

ATLAS Collaboration

doi:10.1140/epjc/s10052-015-3543-1

Search for the standard model higgs boson produced in association with top quarks and decaying into bb in pp collisions at √s = 8 TeV with the ATLAS detector

ATLAS Collaboration

Aix-Marseille Université and CNRS/IN2P3
University of Oklahoma
Academia Sinica - Institute of Physics
Azerbaijan National Academy of Sciences
University of Amsterdam
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 Liverpool
University of Belgrade
Laboratório de Instrumentação e Física Experimental de Partículas
University of Granada
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
National Technical University of Athens
The University of Chicago
Columbia University
University of Birmingham
University of Naples Federico II
University of Copenhagen
Queen Mary University of London
Kobe University
University of Valencia
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
University of Geneva
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
University of Pisa
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
Lawrence Berkeley National Laboratory
Université Paris-Sud and CNRS/IN2P3
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
Stony Brook University
University of Manchester
Polish Academy of Sciences
University of Wisconsin-Madison
University of Wuppertal
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
Lancaster University
University of Glasgow
University of California at Santa Cruz
California State University Fresno
Ohio State University
Laboratoire de Physique Nucléaire et de Hautes Energies
Tufts University
University of Fribourg
Johannes Gutenberg University Mainz
University of Warwick
Gaziantep University
McGill University
Carleton University
University of Massachusetts
University of Hassan II Casablanca
York University Toronto
Uppsala University
New York University
Royal Holloway University of London
Radboud University Nijmegen
University of Edinburgh
University of Pittsburgh
University College London
University of Göttingen
University of Sydney
University of Washington
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
Hong Kong University of Science and Technology
SUNY Albany
Université Clermont Auvergne
Oklahoma State University
University of Texas at Arlington
Tokyo Metropolitan University
University of Oregon
University of Udine
University of Pennsylvania
Weizmann Institute of Science
University of the Witwatersrand
Universidad Técnica Federico Santa Maria
University of Bergen
Simon Fraser University
University of Oslo
TU Dortmund University
University of Alberta
Ankara University
Southern Methodist University
University of Calabria
Pontificia Universidad Católica de Chile
University of Porto
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
Indiana University Bloomington
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
Mohamed I University
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
University of Science and Technology of China
National Center for Energy, Nuclear Science and Technology
University of New Mexico
University of Salento
Louisiana Tech University
ICREA
Shanghai Jiao Tong University
A. Alikhanian Yerevan Institute of Physics
University of Cape Town
University of Tsukuba
Belarus Academy of Sciences
Nagoya University
Shinshu University
Institute of Science Tokyo
Belarusian State University
National Tsing Hua University
Waseda University
University of Texas at Austin
Kyoto University
University of Texas at Dallas
Adelaide University
University of Innsbruck
Ilia State University
Kyushu University
Georgian Technical University
Ochanomizu University
Manhattan College
Istanbul Aydin University
University of Würzburg
KTH Royal Institute of Technology
Universidad Antonio Nariño
University of Iowa
Hampton University
Moscow Institute of Physics and Technology
Hiroshima Institute of Technology
Okayama University
University of Minho
Universidad de Buenos Aires
Jagiellonian University in Kraków
International School for Advanced Studies
National Institute for Research and Development of Isotopic and Molecular Technologies
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
Stanford University
Wigner Research Centre for Physics
University of KwaZulu-Natal
University of Malaya

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115 引用（Scopus）

摘要

A search for the Standard Model Higgs boson produced in association with a top-quark pair, ttH, is presented. The analysis uses 20.3 fb^-1 of pp collision data at √s = 8 TeV, collected with the ATLAS detector at the Large Hadron Collider during 2012. The search is designed for the H → bb decay mode and uses events containing one or two electrons or muons. In order to improve the sensitivity of the search, events are categorised according to their jet and b-tagged jet multiplicities. A neural network is used to discriminate between signal and background events, the latter being dominated by tt+jets production. In the single-lepton channel, variables calculated using a matrix element method are included as inputs to the neural network to improve discrimination of the irreducible tt+bb background. No significant excess of events above the background expectation is found and an observed (expected) limit of 3.4 (2.2) times the StandardModel cross section is obtained at 95% confidence level. The ratio of the measured ttH signal cross section to the StandardModel expectation is found to be µ = 1.5±1.1 assuming a Higgs boson mass of 125 GeV.

源语言	英语
文章编号	349
页（从-至）	1-50
页数	50
期刊	European Physical Journal C
卷	75
期	7
DOI	https://doi.org/10.1140/epjc/s10052-015-3543-1
出版状态	已出版 - 30 7月 2015
已对外发布	是

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10.1140/epjc/s10052-015-3543-1

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@article{80c7bcb49acf4dbd899a25d349c9d040,

title = "Search for the standard model higgs boson produced in association with top quarks and decaying into bb in pp collisions at √s = 8 TeV with the ATLAS detector",

abstract = "A search for the Standard Model Higgs boson produced in association with a top-quark pair, ttH, is presented. The analysis uses 20.3 fb-1 of pp collision data at √s = 8 TeV, collected with the ATLAS detector at the Large Hadron Collider during 2012. The search is designed for the H → bb decay mode and uses events containing one or two electrons or muons. In order to improve the sensitivity of the search, events are categorised according to their jet and b-tagged jet multiplicities. A neural network is used to discriminate between signal and background events, the latter being dominated by tt+jets production. In the single-lepton channel, variables calculated using a matrix element method are included as inputs to the neural network to improve discrimination of the irreducible tt+bb background. No significant excess of events above the background expectation is found and an observed (expected) limit of 3.4 (2.2) times the StandardModel cross section is obtained at 95\% confidence level. The ratio of the measured ttH signal cross section to the StandardModel expectation is found to be µ = 1.5±1.1 assuming a Higgs boson mass of 125 GeV.",

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 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 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 L. Yuan",

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

year = "2015",

month = jul,

day = "30",

doi = "10.1140/epjc/s10052-015-3543-1",

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T1 - Search for the standard model higgs boson produced in association with top quarks and decaying into bb in pp collisions at √s = 8 TeV with 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 - 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 - 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 - Yuan, L.

PY - 2015/7/30

Y1 - 2015/7/30

N2 - A search for the Standard Model Higgs boson produced in association with a top-quark pair, ttH, is presented. The analysis uses 20.3 fb-1 of pp collision data at √s = 8 TeV, collected with the ATLAS detector at the Large Hadron Collider during 2012. The search is designed for the H → bb decay mode and uses events containing one or two electrons or muons. In order to improve the sensitivity of the search, events are categorised according to their jet and b-tagged jet multiplicities. A neural network is used to discriminate between signal and background events, the latter being dominated by tt+jets production. In the single-lepton channel, variables calculated using a matrix element method are included as inputs to the neural network to improve discrimination of the irreducible tt+bb background. No significant excess of events above the background expectation is found and an observed (expected) limit of 3.4 (2.2) times the StandardModel cross section is obtained at 95% confidence level. The ratio of the measured ttH signal cross section to the StandardModel expectation is found to be µ = 1.5±1.1 assuming a Higgs boson mass of 125 GeV.

AB - A search for the Standard Model Higgs boson produced in association with a top-quark pair, ttH, is presented. The analysis uses 20.3 fb-1 of pp collision data at √s = 8 TeV, collected with the ATLAS detector at the Large Hadron Collider during 2012. The search is designed for the H → bb decay mode and uses events containing one or two electrons or muons. In order to improve the sensitivity of the search, events are categorised according to their jet and b-tagged jet multiplicities. A neural network is used to discriminate between signal and background events, the latter being dominated by tt+jets production. In the single-lepton channel, variables calculated using a matrix element method are included as inputs to the neural network to improve discrimination of the irreducible tt+bb background. No significant excess of events above the background expectation is found and an observed (expected) limit of 3.4 (2.2) times the StandardModel cross section is obtained at 95% confidence level. The ratio of the measured ttH signal cross section to the StandardModel expectation is found to be µ = 1.5±1.1 assuming a Higgs boson mass of 125 GeV.

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DO - 10.1140/epjc/s10052-015-3543-1

M3 - 文章

AN - SCOPUS:84938308942

SN - 1434-6044

VL - 75

SP - 1

EP - 50

JO - European Physical Journal C

JF - European Physical Journal C

IS - 7

M1 - 349

ER -

Search for the standard model higgs boson produced in association with top quarks and decaying into bb in pp collisions at √s = 8 TeV with the ATLAS detector

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