Centrality Dependence of the Charged-Particle Multiplicity Density at Midrapidity in Pb-Pb 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>
K. AamodtDepartment of Physics and Technology, University of Bergen, Bergen, NorwayA. Abrahantes QuintanaCentro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Havana, CubaD. AdamováNuclear Physics Institute, Academy of Sciences of the Czech Republic, Řež u Prahy, Czech RepublicA. AdareYale University, New Haven, Connecticut, United StatesM. M. AggarwalPhysics Department, Panjab University, Chandigarh, IndiaG. Aglieri RinellaEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandA.G. AgócsKFKI Research Institute for Particle and Nuclear Physics, Hungarian Academy of Sciences, Budapest, HungaryS. Aguilar SalazarInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoZ. AhammedVariable Energy Cyclotron Centre, Kolkata, IndiaN. AhmadDepartment of Physics Aligarh Muslim University, Aligarh, IndiaA. Ahmad MasoodiDepartment of Physics Aligarh Muslim University, Aligarh, IndiaS. U. AhnGangneung-Wonju National University, Gangneung, South KoreaA. AkindinovInstitute for Theoretical and Experimental Physics, Moscow, RussiaD. AleksandrovRussian Research Centre Kurchatov Institute, Moscow, RussiaB. AlessandroSezione INFN, Turin, ItalyR. Alfaro MolinaInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoA. AliciDipartimento di Fisica dell’Università and Sezione INFN, Bologna, ItalyA. AlkinBogolyubov Institute for Theoretical Physics, Kiev, UkraineE. Almaráz AviñaInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoT. AltFrankfurt Institute for Advanced Studies, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyV. AltiniDipartimento Interateneo di Fisica ‘M. Merlin’ and Sezione INFN, Bari, ItalyS. AltinpinarResearch Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, GermanyI. AltsybeevC. AndreiA. AndronicResearch Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, GermanyV. AnguelovKirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyC. AnsonDepartment of Physics, Ohio State University, Columbus, Ohio, United StatesT. AntičićRudjer Bošković Institute, Zagreb, CroatiaF. AntinoriSezione INFN, Padova, ItalyP. AntonioliSezione INFN, Bologna, ItalyL. AphecetcheSUBATECH, Ecole des Mines de Nantes, Université de Nantes, CNRS-IN2P3, Nantes, FranceH. AppelshäuserInstitut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyN. ArborLaboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier, CNRS-IN2P3, Institut Polytechnique de Grenoble, Grenoble, FranceS. ArcelliDipartimento di Fisica dell’Università and Sezione INFN, Bologna, ItalyA. ArendInstitut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyN. ArmestoDepartamento de Física de Partículas and IGFAE, Universidad de Santiago de Compostela, Santiago de Compostela, SpainR. ArnaldiSezione INFN, Turin, ItalyT. AronssonYale University, New Haven, Connecticut, United StatesI. C. ArseneResearch Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, GermanyA. AsryanA. AugustinusEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandR. AverbeckResearch Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, GermanyT. C. AwesOak Ridge National Laboratory, Oak Ridge, Tennessee, United StatesJ. ÄystöHelsinki Institute of Physics (HIP) and University of Jyväskylä, Jyväskylä, FinlandM. D. AzmiDepartment of Physics Aligarh Muslim University, Aligarh, IndiaM. BachFrankfurt Institute for Advanced Studies, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyA. BadalàSezione INFN, Catania, ItalyY. W. BaekGangneung-Wonju National University, Gangneung, South KoreaS. BagnascoSezione INFN, Turin, ItalyR. BailhacheInstitut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyR. BalaDipartimento di Fisica Sperimentale dell’Università and Sezione INFN, Turin, ItalyR. Baldini FerroliCentro Fermi-Centro Studi e Ricerche e Museo Storico della Fisica “Enrico Fermi”, Rome, ItalyA. BaldisseriCommissariat à l’Energie Atomique, IRFU, Saclay, FranceA. BalditUniversité Clermont AuvergneJ. BánInstitute of Experimental Physics, Slovak Academy of Sciences, Košice, SlovakiaR. BarberaDipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Catania, ItalyF. BarileDipartimento Interateneo di Fisica ‘M. Merlin’ and Sezione INFN, Bari, ItalyG. G. BarnaföldiKFKI Research Institute for Particle and Nuclear Physics, Hungarian Academy of Sciences, Budapest, HungaryL. S. BarnbySchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomV. BarretLaboratoire de Physique Corpusculaire (LPC), Clermont Université, Université Blaise Pascal, CNRS-IN2P3, Clermont-Ferrand, FranceJ. BartkeThe Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, PolandM. BasileDipartimento di Fisica dell’Università and Sezione INFN, Bologna, ItalyN. BastidLaboratoire de Physique Corpusculaire (LPC), Clermont Université, Université Blaise Pascal, CNRS-IN2P3, Clermont-Ferrand, FranceB. BathenInstitut für Kernphysik, Westfälische Wilhelms-Universität Münster, Münster, GermanyG. BatigneSUBATECH, Ecole des Mines de Nantes, Université de Nantes, CNRS-IN2P3, Nantes, FranceB. BatyunyaJoint Institute for Nuclear Research (JINR), Dubna, RussiaC. BaumannInstitut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyI. G. BeardenNiels Bohr Institute, University of Copenhagen, Copenhagen, DenmarkH. P. BeckInstitut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyI. BelikovUniversité de StrasbourgF. BelliniDipartimento di Fisica dell’Università and Sezione INFN, Bologna, ItalyR. BellwiedWayne State University, Detroit, Michigan, United StatesE. Belmont‐MorenoInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoS. BeolèDipartimento di Fisica Sperimentale dell’Università and Sezione INFN, Turin, ItalyI. BerceanuA. BercuciE. BerdermannResearch Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, GermanyY. BerdnikovPetersburg Nuclear Physics Institute, Gatchina, RussiaL. BetevEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandA. BhasinPhysics Department, University of Jammu, Jammu, IndiaA. K. BhatiPhysics Department, Panjab University, Chandigarh, IndiaL. BianchiDipartimento di Fisica Sperimentale dell’Università and Sezione INFN, Turin, ItalyN. BianchiLaboratori Nazionali di Frascati, INFN, Frascati, ItalyC. BianchinDipartimento di Fisica dell’Università and Sezione INFN, Padova, ItalyJ. BielčíkFaculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech RepublicJ. BielčíkováNuclear Physics Institute, Academy of Sciences of the Czech Republic, Řež u Prahy, Czech RepublicA. BilandzicNikhef, National Institute for Subatomic Physics, Amsterdam, NetherlandsE. BiolcatiEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandAurélien BlancLaboratoire de Physique Corpusculaire (LPC), Clermont Université, Université Blaise Pascal, CNRS-IN2P3, Clermont-Ferrand, FranceF. BlancoCentro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT), Madrid, SpainF. BlancoCentro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT), Madrid, SpainD. BlauRussian Research Centre Kurchatov Institute, Moscow, RussiaC. BlumeInstitut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyM. BoccioliEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandNicolas BockDepartment of Physics, Ohio State University, Columbus, Ohio, United StatesA. BogdanovMoscow Engineering Physics Institute, Moscow, RussiaH. BøggildNiels Bohr Institute, University of Copenhagen, Copenhagen, DenmarkM. BogolyubskyInstitute for High Energy Physics, Protvino, RussiaL. BoldizsárKFKI Research Institute for Particle and Nuclear Physics, Hungarian Academy of Sciences, Budapest, HungaryM. BombaraFaculty of Science, P.J. Šafárik University, Košice, Slovakia
2011lv
ABI
Аннотация
The centrality dependence of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at sqrt[s_{NN}]=2.76 TeV is presented. The charged-particle density normalized per participating nucleon pair increases by about a factor of 2 from peripheral (70%-80%) to central (0%-5%) collisions. The centrality dependence is found to be similar to that observed at lower collision energies. The data are compared with models based on different mechanisms for particle production in nuclear collisions.
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