<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>K</mml:mi><mml:mi>S</mml:mi><mml:mn>0</mml:mn></mml:msubsup></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Λ</mml:mi></mml:math>Production 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:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo mathvariant="bold">=</mml:mo><mml:mn>2.76</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:math>
B. AbelevLawrence Livermore National Laboratory, Livermore, California, USAJ. AdamFaculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech RepublicD. AdamováNuclear Physics Institute, Academy of Sciences of the Czech Republic, Řež u Prahy, Czech RepublicA. AdareYale University, New Haven, Connecticut, USAM. M. AggarwalPhysics Department, Panjab University, Chandigarh, IndiaG. Aglieri RinellaEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandM. AgnelloPolitecnico di Torino, Turin, Italy and Sezione INFN, Turin, ItalyA.G. AgócsWigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, HungaryA. AgostinelliDipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Bologna, ItalyZ. AhammedVariable Energy Cyclotron Centre, Kolkata, IndiaN. AhmadDepartment of Physics Aligarh Muslim University, Aligarh, IndiaA. Ahmad MasoodiDepartment of Physics Aligarh Muslim University, Aligarh, IndiaI. AhmedCOMSATS Institute of Information Technology (CIIT), Islamabad, PakistanS. U. AhnKorea Institute of Science and Technology Information, Daejeon, South KoreaS. A. AhnKorea Institute of Science and Technology Information, Daejeon, South KoreaI. AimoPolitecnico di Torino, Turin, Italy and Sezione INFN, Turin, ItalyS. AiolaYale University, New Haven, Connecticut, USAM. AjazCOMSATS Institute of Information Technology (CIIT), Islamabad, PakistanA. AkindinovInstitute for Theoretical and Experimental Physics, Moscow, RussiaD. AleksandrovRussian Research Centre Kurchatov Institute, Moscow, RussiaB. AlessandroSezione INFN, Turin, ItalyD. AlexandreSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomA. AliciCentro Fermi-Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi", Rome, Italy and Sezione INFN, Bologna, ItalyA. AlkinBogolyubov Institute for Theoretical Physics, Kiev, UkraineJ. AlmeFaculty of Engineering, Bergen University College, Bergen, NorwayT. AltFrankfurt Institute for Advanced Studies, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyV. AltiniDipartimento Interateneo di Fisica "M. Merlin" and Sezione INFN, Bari, ItalyS. AltinpinarDepartment of Physics and Technology, University of Bergen, Bergen, NorwayI. AltsybeevV. Fock Institute for Physics, St. Petersburg State University, St. Petersburg, RussiaC. Alves Garcia PradoUniversidade de São Paulo (USP), São Paulo, BrazilC. AndreiA. AndronicResearch Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, GermanyV. AnguelovPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyJ. AnielskiInstitut für Kernphysik, Westfälische Wilhelms-Universität Münster, Münster, GermanyT. 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 e Astronomia dell'Università and Sezione INFN, Bologna, ItalyN. 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, USAI. C. ArseneResearch Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, GermanyM. ArslandokInstitut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyA. 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, USAM. D. AzmiPhysics Department, University of Cape Town, Cape Town, South AfricaM. BachFrankfurt Institute for Advanced Studies, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyA. BadalàSezione INFN, Catania, ItalyY. W. BaekLaboratoire de Physique Corpusculaire (LPC), Clermont Université, Université Blaise Pascal, CNRS-IN2P3, Clermont-Ferrand, France and Gangneung-Wonju National University, Gangneung, South KoreaR. BailhacheInstitut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyV. BairathiPhysics Department, University of Rajasthan, Jaipur, IndiaR. BalaSezione INFN, Turin, Italy and Physics Department, University of Jammu, Jammu, IndiaA. BaldisseriCommissariat à l'Energie Atomique, IRFU, Saclay, FranceF. Baltasar Dos Santos PedrosaEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandJ. BánInstitute of Experimental Physics, Slovak Academy of Sciences, Košice, SlovakiaR. C. BaralInstitute of Physics, Bhubaneswar, IndiaR. BarberaDipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Catania, ItalyF. BarileDipartimento Interateneo di Fisica "M. Merlin" and Sezione INFN, Bari, ItalyG. G. BarnaföldiWigner Research Centre for 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 e Astronomia dell'Università and Sezione INFN, Bologna, ItalyN. BastidLaboratoire de Physique Corpusculaire (LPC), Clermont Université, Université Blaise Pascal, CNRS-IN2P3, Clermont-Ferrand, FranceS. BasuVariable Energy Cyclotron Centre, Kolkata, IndiaB. 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, RussiaP. C. BatzingDepartment of Physics, University of Oslo, Oslo, NorwayC. 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, GermanyN. K. BeheraIndian Institute of Technology Bombay (IIT), Mumbai, IndiaI. BelikovInstitut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg, CNRS-IN2P3, Strasbourg, FranceF. BelliniDipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Bologna, ItalyR. BellwiedUniversity of Houston, Houston, Texas, USAE. Belmont‐MorenoInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoG. BencédiWigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, HungaryS. BeolèDipartimento di Fisica dell'Università and Sezione INFN, Turin, ItalyI. BerceanuA. BercuciY. BerdnikovPetersburg Nuclear Physics Institute, Gatchina, RussiaD. BerényiWigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, HungaryA. A. E. BergognonSUBATECH, Ecole des Mines de Nantes, Université de Nantes, CNRS-IN2P3, Nantes, FranceR. A. BertensInstitute for Subatomic Physics of Utrecht University, Utrecht, NetherlandsD. BerzanoDipartimento di Fisica dell'Università and Sezione INFN, Turin, ItalyL. BetevEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandA. BhasinPhysics Department, University of Jammu, Jammu, IndiaA. K. BhatiPhysics Department, Panjab University, Chandigarh, IndiaJ. BhomUniversity of Tsukuba, Tsukuba, JapanL. BianchiDipartimento di Fisica dell'Università and Sezione INFN, Turin, ItalyN. BianchiLaboratori Nazionali di Frascati, INFN, Frascati, 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. BilandzicNiels Bohr Institute, University of Copenhagen, Copenhagen, DenmarkS. BjelogrlicInstitute for Subatomic Physics of Utrecht University, Utrecht, Netherlands
2013lv
ABI
Аннотация
The ALICE measurement of ${K}_{S}^{0}$ and $\ensuremath{\Lambda}$ production at midrapidity in Pb-Pb collisions at $\sqrt{{s}_{NN}}=2.76\text{ }\text{ }\mathrm{TeV}$ is presented. The transverse momentum (${p}_{T}$) spectra are shown for several collision centrality intervals and in the ${p}_{T}$ range from $0.4\text{ }\text{ }\mathrm{GeV}/c$ ($0.6\text{ }\text{ }\mathrm{GeV}/c$ for $\ensuremath{\Lambda}$) to $12\text{ }\text{ }\mathrm{GeV}/c$. The ${p}_{T}$ dependence of the $\ensuremath{\Lambda}/{K}_{S}^{0}$ ratios exhibits maxima in the vicinity of $3\text{ }\text{ }\mathrm{GeV}/c$, and the positions of the maxima shift towards higher ${p}_{T}$ with increasing collision centrality. The magnitude of these maxima increases by almost a factor of three between most peripheral and most central Pb-Pb collisions. This baryon excess at intermediate ${p}_{T}$ is not observed in $pp$ interactions at $\sqrt{s}=0.9\text{ }\text{ }\mathrm{TeV}$ and at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$. Qualitatively, the baryon enhancement in heavy-ion collisions is expected from radial flow. However, the measured ${p}_{T}$ spectra above $2\text{ }\text{ }\mathrm{GeV}/c$ progressively decouple from hydrodynamical-model calculations. For higher values of ${p}_{T}$, models that incorporate the influence of the medium on the fragmentation and hadronization processes describe qualitatively the ${p}_{T}$ dependence of the $\ensuremath{\Lambda}/{K}_{S}^{0}$ ratio.
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