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Measurement of the top quark pair production cross section in pp collisions at s=7TeV in dilepton final states with ATLAS
Authors:G Aad  B Abbott  J Abdallah  AA Abdelalim  A Abdesselam  O Abdinov  B Abi  M Abolins  H Abramowicz  H Abreu  E Acerbi  BS Acharya  DL Adams  TN Addy  J Adelman  M Aderholz  S Adomeit  L Zwalinski
Institution:1. University at Albany, Albany, NY, United States;2. Department of Physics, University of Alberta, Edmonton, AB, Canada;31. Department of Physics, Ankara University, Ankara, Turkey;32. Department of Physics, Dumlupinar University, Kutahya, Turkey;33. Department of Physics, Gazi University, Ankara, Turkey;34. Division of Physics, TOBB University of Economics and Technology, Ankara, Turkey;35. Turkish Atomic Energy Authority, Ankara, Turkey;4. LAPP, CNRS/IN2P3 and Université de Savoie, Annecy-le-Vieux, France;5. High Energy Physics Division, Argonne National Laboratory, Argonne, IL, United States;6. Department of Physics, University of Arizona, Tucson, AZ, United States;7. Department of Physics, The University of Texas at Arlington, Arlington, TX, United States;8. Physics Department, University of Athens, Athens, Greece;9. Physics Department, National Technical University of Athens, Zografou, Greece;10. Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan;11. Institut de Física d?Altes Energies and Universitat Autònoma de Barcelona and ICREA, Barcelona, Spain;121. Institute of Physics, University of Belgrade, Belgrade, Serbia;122. Vinca Institute of Nuclear Sciences, Belgrade, Serbia;13. Department for Physics and Technology, University of Bergen, Bergen, Norway;14. Physics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley, CA, United States;15. Department of Physics, Humboldt University, Berlin, Germany;16. Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, Switzerland;17. School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom;181. Department of Physics, Bogazici University, Istanbul, Turkey;182. Division of Physics, Dogus University, Istanbul, Turkey;183. Department of Physics Engineering, Gaziantep University, Gaziantep, Turkey;184. Department of Physics, Istanbul Technical University, Istanbul, Turkey;191. INFN Sezione di Bologna, Italy;192. Dipartimento di Fisica, Università di Bologna, Bologna, Italy;20. Physikalisches Institut, University of Bonn, Bonn, Germany;21. Department of Physics, Boston University, Boston, MA, United States;22. Department of Physics, Brandeis University, Waltham, MA, United States;231. Universidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, Brazil;232. Instituto de Fisica, Universidade de Sao Paulo, Sao Paulo, Brazil;24. Physics Department, Brookhaven National Laboratory, Upton, NY, United States;251. National Institute of Physics and Nuclear Engineering, Bucharest, Romania;252. University Politehnica Bucharest, Bucharest, Romania;253. West University in Timisoara, Timisoara, Romania;26. Departamento de Física, Universidad de Buenos Aires, Buenos Aires, Argentina;27. Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom;28. Department of Physics, Carleton University, Ottawa, ON, Canada;29. CERN, Geneva, Switzerland;30. Enrico Fermi Institute, University of Chicago, Chicago, IL, United States;311. Departamento de Fisica, Pontificia Universidad Católica de Chile, Santiago, Chile;312. Departamento de Física, Universidad Técnica Federico Santa María, Valparaíso, Chile;321. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China;322. Department of Modern Physics, University of Science and Technology of China, Anhui, China;323. Department of Physics, Nanjing University, Jiangsu, China;324. High Energy Physics Group, Shandong University, Shandong, China;33. Laboratoire de Physique Corpusculaire, Clermont Université and Université Blaise Pascal and CNRS/IN2P3, Aubiere Cedex, France;34. Nevis Laboratory, Columbia University, Irvington, NY, United States;35. Niels Bohr Institute, University of Copenhagen, Kobenhavn, Denmark;361. INFN Gruppo Collegato di Cosenza, Italy;362. Dipartimento di Fisica, Università della Calabria, Arcavata di Rende, Italy;37. Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Krakow, Poland;38. The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland;39. Physics Department, Southern Methodist University, Dallas, TX, United States;40. Physics Department, University of Texas at Dallas, Richardson, TX, United States;41. DESY, Hamburg and Zeuthen, Germany;42. Institut für Experimentelle Physik IV, Technische Universität Dortmund, Dortmund, Germany;43. Institut für Kern- und Teilchenphysik, Technical University Dresden, Dresden, Germany;44. Department of Physics, Duke University, Durham, NC, United States;45. SUPA – School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom;46. Fachhochschule Wiener Neustadt, Johannes Gutenbergstrasse 3, 2700 Wiener Neustadt, Austria;47. INFN Laboratori Nazionali di Frascati, Frascati, Italy;48. Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg i.Br., Germany;49. Section de Physique, Université de Genève, Geneva, Switzerland;501. INFN Sezione di Genova, Italy;502. Dipartimento di Fisica, Università di Genova, Genova, Italy;51. Institute of Physics and HEP Institute, Georgian Academy of Sciences and Tbilisi State University, Tbilisi, Georgia;52. II Physikalisches Institut, Justus-Liebig-Universität Giessen, Giessen, Germany;53. SUPA – School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom;54. II Physikalisches Institut, Georg-August-Universität, Göttingen, Germany;55. Laboratoire de Physique Subatomique et de Cosmologie, Université Joseph Fourier and CNRS/IN2P3 and Institut National Polytechnique de Grenoble, Grenoble, France;56. Department of Physics, Hampton University, Hampton, VA, United States;57. Laboratory for Particle Physics and Cosmology, Harvard University, Cambridge, MA, United States;581. Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany;582. Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany;583. ZITI Institut für technische Informatik, Ruprecht-Karls-Universität Heidelberg, Mannheim, Germany;59. Faculty of Science, Hiroshima University, Hiroshima, Japan;60. Faculty of Applied Information Science, Hiroshima Institute of Technology, Hiroshima, Japan;61. Department of Physics, Indiana University, Bloomington, IN, United States;62. Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität, Innsbruck, Austria;63. University of Iowa, Iowa City, IA, United States;64. Department of Physics and Astronomy, Iowa State University, Ames, IA, United States;65. Joint Institute for Nuclear Research, JINR Dubna, Dubna, Russia;66. KEK, High Energy Accelerator Research Organization, Tsukuba, Japan;67. Graduate School of Science, Kobe University, Kobe, Japan;68. Faculty of Science, Kyoto University, Kyoto, Japan;69. Kyoto University of Education, Kyoto, Japan;70. Instituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, Argentina;71. Physics Department, Lancaster University, Lancaster, United Kingdom;721. INFN Sezione di Lecce, Italy;722. Dipartimento di Fisica, Università del Salento, Lecce, Italy;73. Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom;74. Department of Physics, Jo?ef Stefan Institute and University of Ljubljana, Ljubljana, Slovenia;75. Department of Physics, Queen Mary University of London, London, United Kingdom;76. Department of Physics, Royal Holloway University of London, Surrey, United Kingdom;77. Department of Physics and Astronomy, University College London, London, United Kingdom;78. Laboratoire de Physique Nucléaire et de Hautes Energies, UPMC and Université Paris-Diderot and CNRS/IN2P3, Paris, France;79. Fysiska Institutionen, Lunds Universitet, Lund, Sweden;80. Departamento de Fisica Teorica C-15, Universidad Autonoma de Madrid, Madrid, Spain;81. Institut für Physik, Universität Mainz, Mainz, Germany;82. School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom;83. CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France;84. Department of Physics, University of Massachusetts, Amherst, MA, United States;85. Department of Physics, McGill University, Montreal, QC, Canada;86. School of Physics, University of Melbourne, Victoria, Australia;87. Department of Physics, The University of Michigan, Ann Arbor, MI, United States;88. Department of Physics and Astronomy, Michigan State University, East Lansing, MI, United States;891. INFN Sezione di Milano, Italy;892. Dipartimento di Fisica, Università di Milano, Milano, Italy;90. B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, Belarus;91. National Scientific and Educational Centre for Particle and High Energy Physics, Minsk, Belarus;92. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, United States;93. Group of Particle Physics, University of Montreal, Montreal, QC, Canada;94. P.N. Lebedev Institute of Physics, Academy of Sciences, Moscow, Russia;95. Institute for Theoretical and Experimental Physics (ITEP), Moscow, Russia;96. Moscow Engineering and Physics Institute (MEPhI), Moscow, Russia;97. Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia;98. Fakultät für Physik, Ludwig-Maximilians-Universität München, München, Germany;99. Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), München, Germany;100. Nagasaki Institute of Applied Science, Nagasaki, Japan;101. Graduate School of Science, Nagoya University, Nagoya, Japan;1021. INFN Sezione di Napoli, Italy;1022. Dipartimento di Scienze Fisiche, Università di Napoli, Napoli, Italy;103. Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM, United States;104. Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen, Netherlands;105. Nikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, Netherlands;106. Department of Physics, Northern Illinois University, DeKalb, IL, United States;107. Budker Institute of Nuclear Physics (BINP), Novosibirsk, Russia;108. Department of Physics, New York University, New York, NY, United States;109. Ohio State University, Columbus, OH, United States;110. Faculty of Science, Okayama University, Okayama, Japan;111. Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK, United States;112. Department of Physics, Oklahoma State University, Stillwater, OK, United States;113. Palacký University, RCPTM, Olomouc, Czech Republic;114. Center for High Energy Physics, University of Oregon, Eugene, OR, United States;115. LAL, Univ. Paris-Sud and CNRS/IN2P3, Orsay, France;116. Graduate School of Science, Osaka University, Osaka, Japan;117. Department of Physics, University of Oslo, Oslo, Norway;118. Department of Physics, Oxford University, Oxford, United Kingdom;1191. INFN Sezione di Pavia, Italy;1192. Dipartimento di Fisica Nucleare e Teorica, Università di Pavia, Pavia, Italy;120. Department of Physics, University of Pennsylvania, Philadelphia, PA, United States;121. Petersburg Nuclear Physics Institute, Gatchina, Russia;1221. INFN Sezione di Pisa, Italy;1222. Dipartimento di Fisica E. Fermi, Università di Pisa, Pisa, Italy;123. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA, United States;1241. Laboratorio de Instrumentacao e Fisica Experimental de Particulas – LIP, Lisboa, Portugal, Spain;1242. Departamento de Fisica Teorica y del Cosmos and CAFPE, Universidad de Granada, Granada, Spain;125. Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic;126. Faculty of Mathematics and Physics, Charles University in Prague, Praha, Czech Republic;127. Czech Technical University in Prague, Praha, Czech Republic;128. State Research Center Institute for High Energy Physics, Protvino, Russia;129. Particle Physics Department, Rutherford Appleton Laboratory, Didcot, United Kingdom;130. Physics Department, University of Regina, Regina, SK, Canada;131. Ritsumeikan University, Kusatsu, Shiga, Japan;1321. INFN Sezione di Roma I, Italy;1322. Dipartimento di Fisica, Università La Sapienza, Roma, Italy;1331. INFN Sezione di Roma Tor Vergata, Italy;1332. Dipartimento di Fisica, Università di Roma Tor Vergata, Roma, Italy;1341. INFN Sezione di Roma Tre, Italy;1342. Dipartimento di Fisica, Università Roma Tre, Roma, Italy;1351. Faculté des Sciences Ain Chock, Réseau Universitaire de Physique des Hautes Energies – Université Hassan II, Casablanca, Morocco;1352. Centre National de l?Energie des Sciences Techniques Nucleaires, Rabat, Morocco;1353. Université Cadi Ayyad, Faculté des sciences Semlalia Département de Physique, B.P. 2390 Marrakech 40000, Morocco;1354. Faculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, Morocco;1355. Faculté des Sciences, Université Mohammed V, Rabat, Morocco;136. DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l?Univers), CEA Saclay (Commissariat a l?Energie Atomique), Gif-sur-Yvette, France;137. Santa Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz, CA, United States;138. Department of Physics, University of Washington, Seattle, WA, United States;139. Department of Physics and Astronomy, University of Sheffield, Sheffield, United Kingdom;140. Department of Physics, Shinshu University, Nagano, Japan;141. Fachbereich Physik, Universität Siegen, Siegen, Germany;142. Department of Physics, Simon Fraser University, Burnaby BC, Canada;143. SLAC National Accelerator Laboratory, Stanford, CA, United States;1441. Faculty of Mathematics, Physics & Informatics, Comenius University, Bratislava, Slovak Republic;1442. Department of Subnuclear Physics, Institute of Experimental Physics of the Slovak Academy of Sciences, Kosice, Slovak Republic;1451. Department of Physics, University of Johannesburg, Johannesburg, South Africa;1452. School of Physics, University of the Witwatersrand, Johannesburg, South Africa;1461. Department of Physics, Stockholm University, Sweden;1462. The Oskar Klein Centre, Stockholm, Sweden;147. Physics Department, Royal Institute of Technology, Stockholm, Sweden;148. Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY, United States;149. Department of Physics and Astronomy, University of Sussex, Brighton, United Kingdom;150. School of Physics, University of Sydney, Sydney, Australia;151. Institute of Physics, Academia Sinica, Taipei, Taiwan;152. Department of Physics, Technion: Israel Inst. of Technology, Haifa, Israel;153. Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel;154. Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece;155. International Center for Elementary Particle Physics and Department of Physics, The University of Tokyo, Tokyo, Japan;156. Graduate School of Science and Technology, Tokyo Metropolitan University, Tokyo, Japan;157. Department of Physics, Tokyo Institute of Technology, Tokyo, Japan;158. Department of Physics, University of Toronto, Toronto, ON, Canada;1591. TRIUMF, Vancouver, BC, Canada;1592. Department of Physics and Astronomy, York University, Toronto, ON, Canada;160. Institute of Pure and Applied Sciences, University of Tsukuba, Ibaraki, Japan;161. Science and Technology Center, Tufts University, Medford, MA, United States;162. Centro de Investigaciones, Universidad Antonio Narino, Bogota, Colombia;163. Department of Physics and Astronomy, University of California Irvine, Irvine, CA, United States;1641. INFN Gruppo Collegato di Udine, Italy;1642. ICTP, Trieste, Italy;1643. Dipartimento di Fisica, Università di Udine, Udine, Italy;165. Department of Physics, University of Illinois, Urbana, IL, United States;166. Department of Physics and Astronomy, University of Uppsala, Uppsala, Sweden;167. Instituto de Física Corpuscular (IFIC) and Departamento de Física Atómica, Molecular y Nuclear and Departamento de Ingenierá Electrónica and Instituto de Microelectrónica de Barcelona (IMB-CNM), University of Valencia and CSIC, Valencia, Spain;168. Department of Physics, University of British Columbia, Vancouver, BC, Canada;169. Department of Physics and Astronomy, University of Victoria, Victoria, BC, Canada;170. Waseda University, Tokyo, Japan;171. Department of Particle Physics, The Weizmann Institute of Science, Rehovot, Israel;172. Department of Physics, University of Wisconsin, Madison, WI, United States;173. Fakultät für Physik und Astronomie, Julius-Maximilians-Universität, Würzburg, Germany;174. Fachbereich C Physik, Bergische Universität Wuppertal, Wuppertal, Germany;175. Department of Physics, Yale University, New Haven, CT, United States;176. Yerevan Physics Institute, Yerevan, Armenia;177. Domaine scientifique de la Doua, Centre de Calcul CNRS/IN2P3, Villeurbanne Cedex, France
Abstract:A measurement of the production cross section of top quark pairs (tt¯) in proton–proton collisions at a center-of-mass energy of 7 TeV recorded with the ATLAS detector at the Large Hadron Collider is reported. Candidate events are selected in the dilepton topology with large missing transverse energy and at least two jets. Using a data sample corresponding to an integrated luminosity of 35pb?1, a tt¯ production cross section σtt¯=177±20(stat.)±14(syst.)±7(lum.)pb is measured for an assumed top quark mass of mt=172.5GeV. A second measurement requiring at least one jet identified as coming from a b quark yields a comparable result, demonstrating that the dilepton final states are consistent with being accompanied by b-quark jets. These measurements are in good agreement with Standard Model predictions.
Keywords:
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