Article
Search for vectorlike B quarks in events with one isolated lepton, missing transverse momentum, and jets at s=8 TeV with the ATLAS detector
Physical Review D, American Physical Society (APS), ISSN 1089-4918
Volume 91, 11, 2015
DOI:10.1103/physrevd.91.112011, Dimensions: pub.1034860239,
Authors
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- (1) Center for Particle Physics of Marseilles, grid.470046.1
- (2) University of Oklahoma, grid.266900.b
- (3) Institute of Physics, Academia Sinica, grid.482252.b
- (4) Institute of Physics, grid.435347.2
- (5) National Institute for Subatomic Physics, grid.420012.5
- (6) Michigan State University, grid.17088.36
- (7) University of Toronto, grid.17063.33
- (8) Tel Aviv University, grid.12136.37
- (9) Technion – Israel Institute of Technology, grid.6451.6
- (10) European Organization for Nuclear Research, grid.9132.9
- (11) Stockholm University, grid.10548.38
- (12) International Centre for Theoretical Physics, grid.419330.c
- (13) INFN Sezione di Trieste, grid.470223.0
- (14) AGH University of Science and Technology, grid.9922.0
- (15) Brookhaven National Laboratory, grid.202665.5
- (16) Northern Illinois University, grid.261128.e
- (17) Ludwig Maximilian University of Munich, grid.5252.0
- (18) Rutherford Appleton Laboratory, grid.76978.37
- (19) University of Liverpool, grid.10025.36
- (20) University of Belgrade, grid.7149.b
- (21) University of Granada, grid.4489.1
- (22) Laboratory of Instrumentation and Experimental Particles Physics, grid.420929.4
- (23) University of Bern, grid.5734.5
- (24) Boston University, grid.189504.1
- (25) Joint Institute for Nuclear Research, grid.33762.33
- (26) INFN Sezione di Roma II, grid.470219.9
- (27) University of Rome Tor Vergata, grid.6530.0
- (28) Lund University, grid.4514.4
- (29) University of Tokyo, grid.26999.3d
- (30) Russian Academy of Sciences, grid.4886.2
- (31) INFN Sezione di Bologna, grid.470193.8
- (32) University of Bologna, grid.6292.f
- (33) Department of Physics and Astronomy, University of Victoria, Victoria British Columbia, Canada
- (34) Laboratory of Subatomic Physics and Cosmology, grid.472561.3
- (35) Instituto de Física La Plata, grid.450288.3
- (36) Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering, grid.443874.8
- (37) National Technical University of Athens, grid.4241.3
- (38) INFN Sezione di Milano, grid.470206.7
- (39) Enrico Fermi Institute, University of Chicago, Chicago IL, USA
- (40) Columbia University, grid.21729.3f
- (41) University of Birmingham, grid.6572.6
- (42) INFN Sezione di Napoli, grid.470211.1
- (43) University of Naples Federico II, grid.4691.a
- (44) University of Copenhagen, grid.5254.6, KU
- (45) Queen Mary University of London, grid.4868.2
- (46) Institute for Corpuscular Physics, grid.470047.0
- (47) High Energy Accelerator Research Organization, grid.410794.f
- (48) Federal University of Rio de Janeiro, grid.8536.8
- (49) Brandeis University, grid.253264.4
- (50) Department of Physics, The University of Michigan, Ann Arbor Michigan, USA
- (51) University of Coimbra, grid.8051.c
- (52) University of Lisbon, grid.9983.b
- (53) University of Freiburg, grid.5963.9
- (54) University of Sheffield, grid.11835.3e
- (55) University of Geneva, grid.8591.5
- (56) Heidelberg University, grid.7700.0
- (57) University of Milan, grid.4708.b
- (58) National and Kapodistrian University of Athens, grid.5216.0
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- (60) Budker Institute of Nuclear Physics, grid.418495.5
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- (62) INFN Sezione di Pisa, grid.470216.6
- (63) University of Pisa, grid.5395.a
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- (66) Institute of Experimental Physics, grid.435184.f
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- (73) University of Cambridge, grid.5335.0
- (74) University of Bonn, grid.10388.32
- (75) Institute for Theoretical and Experimental Physics, grid.21626.31
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- (98) University of Melbourne, grid.1008.9
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- (104) University of Oxford, grid.4991.5
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- (119) York University, grid.21100.32
- (120) Uppsala University, grid.8993.b
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- (123) Radboud University Nijmegen, grid.5590.9
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- (125) University of Pittsburgh, grid.21925.3d
- (126) University College London, grid.83440.3b
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- (128) University of Sydney, grid.1013.3
- (129) Department of Physics, University of Washington, Seattle Washington, USA
- (130) Lomonosov Moscow State University, grid.14476.30
- (131) Institute for High Energy Physics, grid.424823.b
- (132) University of Hong Kong, grid.194645.b
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- (134) Chinese University of Hong Kong, grid.10784.3a
- (135) University at Albany, State University of New York, grid.265850.c
- (136) Laboratoire de Physique Corpusculaire, grid.470921.9
- (137) Oklahoma State University, grid.65519.3e
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- (139) Tokyo Metropolitan University, grid.265074.2
- (140) University of Oregon, grid.170202.6
- (141) University of Udine, grid.5390.f
- (142) Department of Physics, University of Pennsylvania, Philadelphia Pennsylvania, USA
- (143) Weizmann Institute of Science, grid.13992.30
- (144) University of the Witwatersrand, grid.11951.3d
- (145) Federico Santa María Technical University, grid.12148.3e
- (146) University of Bergen, grid.7914.b
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- (184) National Centre for Nuclear Energy, Science and Technology, grid.450269.c
- (185) University of New Mexico, grid.266832.b
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- (188) Shanghai Jiao Tong University, grid.16821.3c
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- (199) The University of Texas at Dallas, grid.267323.1
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- (206) Universidad Antonio Nariño, grid.440783.c
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- (214) National Institute for Research and Development of Isotopic and Molecular Technologies, grid.435410.7
- (215) Institut National de Physique Nucléaire et de Physique des Particules, grid.433124.3
- (216) Nagasaki Institute of Applied Science, grid.444367.6
- (217) Kyoto University of Education, grid.411219.e
- (218) Ritsumeikan University, grid.262576.2
- (219) Massachusetts Institute of Technology, grid.116068.8
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Description
A search has been performed for pair production of heavy vectorlike down-type (B) quarks. The analysis explores the lepton-plus-jets final state, characterized by events with one isolated charged lepton (electron or muon), significant missing transverse momentum, and multiple jets. One or more jets are required to be tagged as arising from b quarks, and at least one pair of jets must be tagged as arising from the hadronic decay of an electroweak boson. The analysis uses the full data sample of pp collisions recorded in 2012 by the ATLAS detector at the LHC, operating at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb−1. No significant excess of events is observed above the expected background. Limits are set on vectorlike B production, as a function of the B branching ratios, assuming the allowable decay modes are B→Wt/Zb/Hb. In the chiral limit with a branching ratio of 100% for the decay B→Wt, the observed (expected) 95% C.L. lower limit on the vectorlike B mass is 810 GeV (760 GeV). In the case where the vectorlike B quark has branching ratio values corresponding to those of an SU(2) singlet state, the observed (expected) 95% C.L. lower limit on the vectorlike B mass is 640 GeV (505 GeV). The same analysis, when used to investigate pair production of a colored, charge 5/3 exotic fermion T5/3, with subsequent decay T5/3→Wt, sets an observed (expected) 95% C.L. lower limit on the T5/3 mass of 840 GeV (780 GeV).
Funders
- Ministry of Science and Technology of the People's Republic of China
- Australian Research Council
- Federal Department of Economic Affairs Education and Research
- Chinese Academy of Sciences
- Japan Society for the Promotion of Science
- The Research Council of Norway
- National Research Council Canada
- Slovenian Research Agency
- Science and Technology Facilities Council
- Colciencias
- German Research Foundation
- Leverhulme Trust
- Agencia Nacional de Promoción Científica y Tecnológica
- French National Centre for Scientific Research
- European Research Council
- São Paulo Research Foundation
- Ministry of Economy, Industry and Competitiveness
- Federal Ministry of Education and Research
- Brookhaven National Laboratory
- Rosatom (Russia)
- European Commission
- Knut and Alice Wallenberg Foundation
- Dutch Research Council
- Israeli Centers for Research Excellence
- FWF Austrian Science Fund
- Ministry of Education, Science and Sport
- Israel Science Foundation
- Ministry of Education, Culture, Sports, Science and Technology
- Swedish Research Council
- National Natural Science Foundation of China
- Ministry of Education Youth and Sports
- National Institute for Nuclear Physics
- Joint Institute for Nuclear Research
- Ministry of Science and Higher Education
- Comisión Nacional de Investigación Científica y Tecnológica
- Atomic Energy and Alternative Energies Commission
- National Science Center
- Helmholtz Association of German Research Centres
- Ministry of Education, Science, Research and Sport of the Slovak Republic
- Natural Sciences and Engineering Research Council
- Foundation for Science and Technology
- Alexander von Humboldt Foundation
- Swiss National Science Foundation
- Turkish Atomic Energy Authority
- General Secretariat for Research and Technology
- Ministry of Science and Technology
- Federal Ministry of Science, Research and Economics
- United States Department of Energy
- Royal Society
- The Ministry of Education and Science of the Russian Federation
- Ministry of Education, Science and Technological Development
- National Council for Scientific and Technological Development
- Canada Foundation for Innovation
- Danish National Research Foundation
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