Observation of a Centrality-Dependent Dijet Asymmetry in Lead-Lead Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mi>NN</mml:mi></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:math>with the ATLAS Detector at the LHC
G. AadAlbert-Ludwigs-Universität, Fakultät für Mathematik und Physik, Hermann-Herder Strasse 3, D-79104 Freiburg i.Br., GermanyBraden Keim AbbottUniversity of Oklahoma, Homer L. Dodge Department of Physics and Astronomy, 440 West Brooks, Room 100, Norman, Oklahoma 73019-0225, USAJ. AbdallahInstitut de Física d’Altes Energies, IFAE, Edifici Cn, Universitat Autònoma de Barcelona, ES-08193 Bellaterra (Barcelona), SpainA. A. AbdelalimUniversité de Genève, Section de Physique, 24 rue Ernest Ansermet, CH-1211 Geneve 4, SwitzerlandA. AbdesselamOxford University, Department of Physics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, United KingdomO. AbdinovInstitute of Physics, Azerbaijan Academy of Sciences, H. Javid Avenue 33, AZ 143 Baku, AzerbaijanB. AbiOklahoma State University, Department of Physics, 145 Physical Sciences Building, Stillwater, Oklahoma 74078-3072, USAM. AbolinsMichigan State University, Department of Physics and Astronomy, High Energy Physics Group, East Lansing, Michigan 48824-2320, USAH. AbramowiczTel Aviv University, Raymond and Beverly Sackler School of Physics and Astronomy, Ramat Aviv, IL - Tel Aviv 69978, IsraelH. AbreuLAL, Université Paris-Sud, IN2P3/CNRS, Orsay, FranceE. AcerbiINFN Sezione di Milano, via Celoria 16, IT-20133 Milano, ItalyB. S. AcharyaICTP, Strada Costiera 11, IT-34014, Trieste, ItalyM. AckersUniversity of Bonn, Physikalisches Institut, Nussallee 12, D-53115 Bonn, GermanyD. L. AdamsBrookhaven National Laboratory, Physics Department, Building 510A, Upton, New York 11973, USAT. N. AddyHampton University, Department of Physics, Hampton, Virginia 23668, USAJahred AdelmanYale University, Department of Physics, P.O. Box 208121, New Haven, Connecticut 06520-8121, USAM. AderholzMax-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, 80805 München, GermanyS. AdomeitLudwig-Maximilians-Universität München, Fakultät für Physik, Am Coulombwall 1, DE-85748 Garching, GermanyP. AdragnaQueen Mary University of London, Department of Physics, Mile End Road, London E1 4NS, United KingdomTim AdyeRutherford Appleton Laboratory, Science and Technology Facilities Council, Harwell Science and Innovation Campus, Didcot OX11 0QX, United KingdomS. AefskyBrandeis University, Department of Physics, MS057, 415 South Street, Waltham, Massachusetts 02454, USAJ. A. Aguilar–SaavedraUniversidad de Granada, Departamento de Fisica Teorica y del Cosmos and CAFPE, E-18071 Granada, SpainM. AharroucheUniversität Mainz, Institut für Physik, Staudinger Weg 7, DE-55099 Mainz, GermanyS. AhlenBoston University, Department of Physics, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USAF. AhlesAlbert-Ludwigs-Universität, Fakultät für Mathematik und Physik, Hermann-Herder Strasse 3, D-79104 Freiburg i.Br., GermanyA. AhmadStony Brook University, Department of Physics and Astronomy, Nicolls Road, Stony Brook, New York 11794-3800, USAM. AhsanUniversity of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080-3021, USAGiulio AielliINFN Sezione di Roma Tor Vergata, via della Ricerca Scientifica, IT-00133 Roma, ItalyT. AkdoğanBogazici University, Faculty of Sciences, Department of Physics, TR-80815 Bebek-Istanbul, TurkeyTorsten AkessonFysiska institutionen, Lunds Universitet, Box 118, SE-221 00 Lund, SwedenG. AkimotoThe University of Tokyo, International Center for Elementary Particle Physics and Department of Physics, 7-3-1 Hongo, Bunkyo-ku, JP - Tokyo 113-0033, JapanAndrei AkimovP. N. Lebedev Institute of Physics, Academy of Sciences, Leninsky pr. 53, RU-117 924 Moscow, RussiaM. S. AlamRoyal Holloway, University of London, Department of Physics, Egham Hill, Egham, Surrey TW20 0EX, United KingdomM. A. AlamRoyal Holloway, University of London, Department of Physics, Egham Hill, Egham, Surrey TW20 0EX, United KingdomS. AlbrandLPSC, CNRS/IN2P3 and Université Joseph Fourier Grenoble, 53 avenue des Martyrs, FR-38026 Grenoble Cedex, FranceMartin AleksaCERN, CH-1211 Geneva 23, SwitzerlandI. N. AleksandrovJoint Institute for Nuclear Research, JINR Dubna, RU-141980 Moscow Region, RussiaM. AleppoINFN Sezione di Milano, via Celoria 16, IT-20133 Milano, ItalyF. AlessandriaINFN Sezione di Milano, via Celoria 16, IT-20133 Milano, ItalyC. AlexaNational Institute of Physics and Nuclear Engineering Bucharest-Magurele, Strasse Atomistilor 407, P.O. Box MG-6, R-077125, RomaniaG. AlexanderTel Aviv University, Raymond and Beverly Sackler School of Physics and Astronomy, Ramat Aviv, IL - Tel Aviv 69978, IsraelG. AlexandreUniversité de Genève, Section de Physique, 24 rue Ernest Ansermet, CH-1211 Geneve 4, SwitzerlandT. AlexopoulosNational Technical University of Athens, Physics Department, 9-Iroon Polytechniou, GR 15780 Zografou, GreeceMuhammad AlhroobUniversity of Bonn, Physikalisches Institut, Nussallee 12, D-53115 Bonn, GermanyM. AlievHumboldt University, Institute of Physics, Berlin, Newtonstrasse 15, D-12489 Berlin, GermanyGianluca AlimontiINFN Sezione di Milano, via Celoria 16, IT-20133 Milano, ItalyJ. AlisonUniversity of Pennsylvania, Department of Physics, High Energy Physics Group, 209 S. 33rd Street, Philadelphia, Pennsylvania 19104, USAM. AliyevInstitute of Physics, Azerbaijan Academy of Sciences, H. Javid Avenue 33, AZ 143 Baku, AzerbaijanPhilip Patrick AllportUniversity of Liverpool, Oliver Lodge Laboratory, P.O. Box 147, Oxford Street, Liverpool L69 3BX, United KingdomS. E. Allwood-SpiersUniversity of Glasgow, Department of Physics and Astronomy, Glasgow G12 8QQ, United KingdomJ. AlmondUniversity of Manchester, School of Physics and Astronomy, Manchester M13 9PL, United KingdomA. AloisioINFN Sezione di Napoli, via Cinthia, IT-80126 Napoli, ItalyR. AlonThe Weizmann Institute of Science, Department of Particle Physics, P.O. Box 26, IL-76100 Rehovot, IsraelA. AlonsoFysiska institutionen, Lunds Universitet, Box 118, SE-221 00 Lund, SwedenJ. AlonsoLawrence Berkeley National Laboratory and University of California, Physics Division, MS50B-6227, 1 Cyclotron Road, Berkeley, California 94720, USAM. G. AlviggiINFN Sezione di Napoli, via Cinthia, IT-80126 Napoli, ItalyB. R. KoKEK, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba-shi, Ibaraki-ken 305-0801, JapanP. AmaralCERN, CH-1211 Geneva 23, SwitzerlandC. AmelungBrandeis University, Department of Physics, MS057, 415 South Street, Waltham, Massachusetts 02454, USAV. V. AmmosovState Research Center Institute for High Energy Physics, Moscow Region, 142281, Protvino, Pobeda street, 1, RussiaA. AmorimE. RosInstituto de Física Corpuscular (IFIC) Centro Mixto UVEG-CSIC, Apartado 22085 ES-46071 Valencia, Departament Física Atòmica Molecular y Nuclear; Departament Inginyeria Electrónica; Universitat de Valencia, and Institut de Microelectrónica de Barcelona (IMB-CNM-CSIC), 08193 Bellaterra, SpainN. AmramTel Aviv University, Raymond and Beverly Sackler School of Physics and Astronomy, Ramat Aviv, IL - Tel Aviv 69978, IsraelChristos AnastopoulosUniversity of Sheffield, Department of Physics and Astronomy, Hounsfield Road, Sheffield S3 7RH, United KingdomT. AndeenColumbia University, Nevis Laboratory, 136 South Broadway, Irvington, New York 10533, USAC. F. AndersUniversity of Bonn, Physikalisches Institut, Nussallee 12, D-53115 Bonn, GermanyK. J. AndersonUniversity of Chicago, Enrico Fermi Institute, 5640 S. Ellis Avenue, Chicago, Illinois 60637, USAA. AndreazzaINFN Sezione di Milano, via Celoria 16, IT-20133 Milano, ItalyV. AndreiRuprecht-Karls-Universität Heidelberg: Kirchhoff-Institut für Physik, Im Neuenheimer Feld 227, D-69120 Heidelberg, GermanyM-L. AndrieuxLPSC, CNRS/IN2P3 and Université Joseph Fourier Grenoble, 53 avenue des Martyrs, FR-38026 Grenoble Cedex, FranceX. S. AnduagaUniversidad Nacional de La Plata, FCE, Departamento de Física, IFLP (CONICET-UNLP), C.C. 67, 1900 La Plata, ArgentinaAaron AngeramiColumbia University, Nevis Laboratory, 136 South Broadway, Irvington, New York 10533, USAF. AnghinolfiCERN, CH-1211 Geneva 23, SwitzerlandN. AnjosAlberto AnnoviINFN Laboratori Nazionali di Frascati, via Enrico Fermi 40, IT-00044 Frascati, ItalyA. AntonakiUniversity of Athens, Nuclear and Particle Physics, Department of Physics, Panepistimiopouli, Zografou, GR 15771 Athens, GreeceM. AntonelliINFN Laboratori Nazionali di Frascati, via Enrico Fermi 40, IT-00044 Frascati, ItalyS. AntonelliINFN Sezione di Bologna, viale C. Berti Pichat, 6/2, IT-40127 Bologna, ItalyJ. AntošInstitute of Experimental Physics of the Slovak Academy of Sciences, Department of Subnuclear Physics, Watsonova 47, SK-04353 Kosice, Slovak RepublicFabio AnulliINFN Sezione di Roma I, Piazzale A. Moro 2, IT-00185 Roma, ItalyS. AounCPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, FranceL. Aperio BellaLAPP, Université de Savoie, CNRS/IN2P3, Annecy-le-Vieux, FranceR. ApolleOxford University, Department of Physics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, United KingdomG. ArabidzeMichigan State University, Department of Physics and Astronomy, High Energy Physics Group, East Lansing, Michigan 48824-2320, USAI. AracenaSLAC National Accelerator Laboratory, Stanford, California 94309, USAY. AraiKEK, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba-shi, Ibaraki-ken 305-0801, JapanA. T. H. ArceDuke University, Department of Physics, Durham, North Carolina 27708, USAJ. P. ArchambaultCarleton University, Department of Physics, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, CanadaS. ArfaouiCERN, CH-1211 Geneva 23, SwitzerlandJ-F. ArguinLawrence Berkeley National Laboratory and University of California, Physics Division, MS50B-6227, 1 Cyclotron Road, Berkeley, California 94720, USAE. ArıkBogazici University, Faculty of Sciences, Department of Physics, TR-80815 Bebek-Istanbul, TurkeyM. ArikBogazici University, Faculty of Sciences, Department of Physics, TR-80815 Bebek-Istanbul, TurkeyA. J. ArmbrusterThe University of Michigan, Department of Physics, 2477 Randall Laboratory, 500 East University, Ann Arbor, Michigan 48109-1120, USAK. ArmsOhio State University, 191 West Woodruff Avenue, Columbus, Ohio 43210-1117, USAS.R. ArmstrongBrookhaven National Laboratory, Physics Department, Building 510A, Upton, New York 11973, USAO. ArnaezLAPP, Université de Savoie, CNRS/IN2P3, Annecy-le-Vieux, FranceC. ArnaultLAL, Université Paris-Sud, IN2P3/CNRS, Orsay, FranceA. ArtamonovInstitute for Theoretical and Experimental Physics (ITEP), B. Cheremushkinskaya ul. 25, RU 117 218 Moscow, RussiaG. ArtoniINFN Sezione di Roma I, Piazzale A. Moro 2, IT-00185 Roma, ItalyD. ArutinovUniversity of Bonn, Physikalisches Institut, Nussallee 12, D-53115 Bonn, Germany
2010lv
ABI
Аннотация
By using the ATLAS detector, observations have been made of a centrality-dependent dijet asymmetry in the collisions of lead ions at the Large Hadron Collider. In a sample of lead-lead events with a per-nucleon center of mass energy of 2.76 TeV, selected with a minimum bias trigger, jets are reconstructed in fine-grained, longitudinally segmented electromagnetic and hadronic calorimeters. The transverse energies of dijets in opposite hemispheres are observed to become systematically more unbalanced with increasing event centrality leading to a large number of events which contain highly asymmetric dijets. This is the first observation of an enhancement of events with such large dijet asymmetries, not observed in proton-proton collisions, which may point to an interpretation in terms of strong jet energy loss in a hot, dense medium.
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