Suppression of charged particle production at large transverse momentum in central Pb–Pb collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mi mathvariant="italic">NN</mml:mi></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>2.76</mml:mn><mml:mtext> TeV</mml:mtext></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, CT, United StatesM. M. AggarwalPhysics Department, Panjab University, Chandigarh, IndiaG. Aglieri RinellaEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandA. G. AgocsKFKI 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. AltiniInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoS. AltinpinarGSI Helmholtz Centre for Heavy Ion Research, Darmstadt, GermanyI. AltsybeevSt Petersburg University, Saint Petersburg, RussiaC. AndreiDipartimento di Fisica dell'Università and Sezione INFN, Bologna, ItalyA. AndronicGSI Helmholtz Centre for Heavy Ion Research, Darmstadt, GermanyV. AnguelovHeidelberg University, Heidelberg, GermanyC. AnsonThe Ohio State University, Columbus, United StatesT. AntičićFrankfurt Institute for Advanced Studies, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyF. AntinoriUniversity of Padua, Padua, ItalyP. AntonioliL. AphecetcheNantes Université, Nantes, FranceH. AppelshäuserGoethe University Frankfurt, Frankfurt am Main, GermanyN. ArborUniversité Grenoble Alpes, Saint-Martin-d'Hères, FranceS. ArcelliSezione INFN, Turin, ItalyA. ArendGoethe University Frankfurt, Frankfurt am Main, GermanyN. ArmestoUniversidade de Santiago de Compostela, Santiago de Compostela, SpainR. ArnaldiInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoT. AronssonYale University, New Haven, United StatesI. C. ArseneGSI Helmholtz Centre for Heavy Ion Research, Darmstadt, GermanyA. AsryanSt Petersburg University, Saint Petersburg, RussiaA. AugustinusEuropean Organization for Nuclear Research, Geneva, SwitzerlandR. AverbeckGSI Helmholtz Centre for Heavy Ion Research, Darmstadt, GermanyT. C. AwesOak Ridge National Laboratory, Oak Ridge, United StatesJ. ÄystöUniversity of Jyväskylä, Jyvaskyla, FinlandM. D. AzmiAligarh Muslim University, Aligarh, IndiaM. BachGoethe University Frankfurt, Frankfurt am Main, GermanyA. BadalàY. W. BaekGangneung–Wonju National University, Gangneung, South KoreaS. BagnascoSezione INFN, Turin, ItalyR. BailhacheGoethe University Frankfurt, Frankfurt am Main, GermanyR. BalaUniversity of Turin, Turin, ItalyR. Baldini FerroliInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoA. BaldisseriA. BalditUniversité Clermont Auvergne, Clermont-Ferrand, FranceJ. BánSlovak Academy of Sciences, Bratislava, SlovakiaR. BarberaUniversity of Catania, Catania, ItalyF. BarileInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoG. G. BarnaföldiHungarian Academy of Sciences, Budapest, HungaryL. S. BarnbyUniversity of Birmingham, Birmingham, United KingdomV. BarretUniversité Clermont Auvergne, Clermont-Ferrand, FranceJ. BartkePolish Academy of Sciences, Warsaw, PolandM. BasileInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoN. BastidUniversité Clermont Auvergne, Clermont-Ferrand, FranceB. BathenUniversity of Münster, Münster, GermanyG. BatigneNantes Université, Nantes, FranceB. BatyunyaJoint Institute for Nuclear Research, Dubna, RussiaC. BaumannGoethe University Frankfurt, Frankfurt am Main, GermanyI. G. BeardenUniversity of Copenhagen, Copenhagen, DenmarkH. P. BeckGoethe University Frankfurt, Frankfurt am Main, GermanyI. BelikovUniversité de Strasbourg, Strasbourg, FranceF. BelliniInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoR. BellwiedWayne State University, Detroit, United StatesE. Belmont‐MorenoUniversidad Nacional Autónoma de México, Mexico City, MexicoS. BeolèUniversity of Turin, Turin, ItalyI. BerceanuInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoA. BercuciE. BerdermannGSI Helmholtz Centre for Heavy Ion Research, Darmstadt, GermanyY. BerdnikovL. BetevEuropean Organization for Nuclear Research, Geneva, SwitzerlandA. BhasinUniversity of Jammu, Jammu, IndiaA. K. BhatiPanjab University, Chandigarh, IndiaL. BianchiUniversity of Turin, Turin, ItalyN. BianchiInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoC. BianchinUniversity of Padua, Padua, ItalyJ. BielčíkCzech Technical University in Prague, Prague, CzechiaJ. BielčíkováCzech Academy of Sciences, Prague, CzechiaA. BilandzicE. BiolcatiUniversity of Turin, Turin, ItalyAurélien BlancUniversité Clermont Auvergne, Clermont-Ferrand, FranceF. BlancoInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoF. BlancoInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoD. BlauSezione INFN, Turin, ItalyC. BlumeGoethe University Frankfurt, Frankfurt am Main, GermanyM. BoccioliEuropean Organization for Nuclear Research, Geneva, SwitzerlandNicolas BockThe Ohio State University, Columbus, United StatesA. BogdanovMoscow Engineering Physics Institute, Moscow, RussiaH. BøggildUniversity of Copenhagen, Copenhagen, DenmarkM. BogolyubskyInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoL. BoldizsárHungarian Academy of Sciences, Budapest, HungaryM. BombaraInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, Mexico
2010lv
ABI
Annotatsiya
Inclusive transverse momentum spectra of primary charged particles in Pb–Pb collisions at sNN=2.76TeV have been measured by the ALICE Collaboration at the LHC. The data are presented for central and peripheral collisions, corresponding to 0–5% and 70–80% of the hadronic Pb–Pb cross section. The measured charged particle spectra in |η|<0.8 and 0.3<pT<20GeV/c are compared to the expectation in pp collisions at the same sNN, scaled by the number of underlying nucleon–nucleon collisions. The comparison is expressed in terms of the nuclear modification factor RAA. The result indicates only weak medium effects (RAA≈0.7) in peripheral collisions. In central collisions, RAA reaches a minimum of about 0.14 at pT=6–7GeV/c and increases significantly at larger pT. The measured suppression of high-pT particles is stronger than that observed at lower collision energies, indicating that a very dense medium is formed in central Pb–Pb collisions at the LHC.
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