Observation of Associated Near-Side and Away-Side Long-Range Correlations in<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>5.02</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:math>Proton-Lead Collisions with the ATLAS Detector
G. AadFakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg, GermanyT. AbajyanPhysikalisches Institut, University of Bonn, Bonn, GermanyBraden Keim AbbottHomer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma, USAJ. AbdallahInstitut de Física d’Altes Energies and Departament de Física de la Universitat Autònoma de Barcelona and ICREA, Barcelona, SpainS. Abdel KhalekLAL, Université Paris-Sud and CNRS/IN2P3, Orsay, FranceA. A. AbdelalimSection de Physique, Université de Genève, Geneva, SwitzerlandO. AbdinovInstitute of Physics, Azerbaijan Academy of Sciences, Baku, AzerbaijanR. AbenNikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, NetherlandsB. AbiDepartment of Physics, Oklahoma State University, Stillwater, Oklahoma, USAM. AbolinsDepartment of Physics and Astronomy, Michigan State University, East Lansing, Michigan, USAO. S. AbouZeidDepartment of Physics, University of Toronto, Toronto, Ontario, CanadaH. AbramowiczRaymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, IsraelH. AbreuDSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l’Univers), CEA Saclay (Commissariat à l’Energie Atomique et aux Energies Alternatives), Gif-sur-Yvette, FranceB. S. AcharyaICTP, Trieste, ItalyL. AdamczykAGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, PolandD. L. AdamsPhysics Department, Brookhaven National Laboratory, Upton, New York, USAT. N. AddyDepartment of Physics, Hampton University, Hampton, Virginia, USAJahred AdelmanDepartment of Physics, Yale University, New Haven, Connecticut, USAS. AdomeitFakultät für Physik, Ludwig-Maximilians-Universität München, München, GermanyP. AdragnaSchool of Physics and Astronomy, Queen Mary University of London, London, United KingdomTim AdyeParticle Physics Department, Rutherford Appleton Laboratory, Didcot, United KingdomS. AefskyDepartment of Physics, Brandeis University, Waltham, Massachusetts, USAJ. A. Aguilar–SaavedraDepartamento de Fisica Teorica y del Cosmos and CAFPE, Universidad de Granada, Granada, SpainM. AgustoniAlbert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, SwitzerlandS. AhlenDepartment of Physics, Boston University, Boston, Massachusetts, USAF. AhlesFakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg, GermanyA. AhmadDepartments of Physics & Astronomy and Chemistry, Stony Brook University, Stony Brook, New York, USAM. AhsanPhysics Department, University of Texas at Dallas, Richardson, Texas, USAGiulio AielliDipartimento di Fisica, Università di Roma Tor Vergata, Roma, ItalyTorsten AkessonFysiska institutionen, Lunds universitet, Lund, SwedenG. AkimotoInternational Center for Elementary Particle Physics and Department of Physics, The University of Tokyo, Tokyo, JapanAndrei AkimovP.N. Lebedev Institute of Physics, Academy of Sciences, Moscow, RussiaM. A. AlamDepartment of Physics, Royal Holloway University of London, Surrey, United KingdomJ. AlbertDepartment of Physics and Astronomy, University of Victoria, Victoria, British Columbia, CanadaS. AlbrandLaboratoire de Physique Subatomique et de Cosmologie, Université Joseph Fourier and CNRS/IN2P3 and Institut National Polytechnique de Grenoble, Grenoble, FranceMartin AleksaCERN, Geneva, SwitzerlandI. N. AleksandrovJoint Institute for Nuclear Research, JINR Dubna, Dubna, RussiaF. AlessandriaINFN Sezione di Milano, ItalyC. AlexaG. AlexanderRaymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, IsraelG. AlexandreSection de Physique, Université de Genève, Geneva, SwitzerlandT. AlexopoulosPhysics Department, National Technical University of Athens, Zografou, GreeceMuhammad AlhroobDipartimento di Chimica, Fisica e Ambiente, Università di Udine, Udine, ItalyM. AlievDepartment of Physics, Humboldt University, Berlin, GermanyGianluca AlimontiINFN Sezione di Milano, ItalyJ. AlisonDepartment of Physics, University of Pennsylvania, Philadelphia, Pennsylvania, USABenedict AllbrookeSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomL. J. AllisonPhysics Department, Lancaster University, Lancaster, United KingdomPhilip Patrick AllportOliver Lodge Laboratory, University of Liverpool, Liverpool, United KingdomS. E. Allwood-SpiersSUPA-School of Physics and Astronomy, University of Glasgow, Glasgow, United KingdomJ. AlmondSchool of Physics and Astronomy, University of Manchester, Manchester, United KingdomA. AloisioDipartimento di Scienze Fisiche, Università di Napoli, Napoli, ItalyR. AlonDepartment of Particle Physics, The Weizmann Institute of Science, Rehovot, IsraelA. AlonsoNiels Bohr Institute, University of Copenhagen, Kobenhavn, DenmarkF. AlonsoInstituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, ArgentinaA. AltheimerNevis Laboratory, Columbia University, Irvington, New York, USAB. Álvarez GonzálezDepartment of Physics and Astronomy, Michigan State University, East Lansing, Michigan, USAMariagrazia AlviggiDipartimento di Scienze Fisiche, Università di Napoli, Napoli, ItalyK. AmakoKEK, High Energy Accelerator Research Organization, Tsukuba, JapanC. AmelungDepartment of Physics, Brandeis University, Waltham, Massachusetts, USAV. V. AmmosovState Research Center Institute for High Energy Physics, Protvino, RussiaD. Roda Dos SantosLaboratorio de Instrumentacao e Fisica Experimental de Particulas-LIP, Lisboa, PortugalA. AmorimLaboratorio de Instrumentacao e Fisica Experimental de Particulas-LIP, Lisboa, PortugalS. AmorosoFakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg, GermanyN. AmramRaymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, IsraelChristos AnastopoulosCERN, Geneva, SwitzerlandL. S. AncuAlbert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, SwitzerlandN. AndariLAL, Université Paris-Sud and CNRS/IN2P3, Orsay, FranceT. AndeenNevis Laboratory, Columbia University, Irvington, New York, USAC. F. AndersPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyK. J. AndersonEnrico Fermi Institute, University of Chicago, Chicago, Illinois, USAA. AndreazzaDipartimento di Fisica, Università di Milano, Milano, ItalyV. AndreiKirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyX. S. AnduagaInstituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, ArgentinaS. AngelidakisPhysics Department, University of Athens, Athens, GreeceP. AngerInstitut für Kern- und Teilchenphysik, Technical University Dresden, Dresden, GermanyAaron AngeramiNevis Laboratory, Columbia University, Irvington, New York, USAF. AnghinolfiCERN, Geneva, SwitzerlandAlexey AnisenkovBudker Institute of Nuclear Physics, SB RAS, Novosibirsk, RussiaN. AnjosLaboratorio de Instrumentacao e Fisica Experimental de Particulas-LIP, Lisboa, PortugalAlberto AnnoviINFN Laboratori Nazionali di Frascati, Frascati, ItalyA. AntonakiPhysics Department, University of Athens, Athens, GreeceM. AntonelliINFN Laboratori Nazionali di Frascati, Frascati, ItalyА. АнтоновMoscow Engineering and Physics Institute (MEPhI), Moscow, RussiaJ. AntošDepartment of Subnuclear Physics, Institute of Experimental Physics of the Slovak Academy of Sciences, Kosice, Slovak RepublicFabio AnulliINFN Sezione di Roma I, ItalyMasato AokiGraduate School of Science and Kobayashi-Maskawa Institute, Nagoya University, Nagoya, JapanL. Aperio BellaLAPP, CNRS/IN2P3 and Université de Savoie, Annecy-le-Vieux, FranceR. ApolleDepartment of Physics, Oxford University, Oxford, United KingdomG. ArabidzeDepartment of Physics and Astronomy, Michigan State University, East Lansing, Michigan, USAI. AracenaSLAC National Accelerator Laboratory, Stanford, CA, USAY. AraiKEK, High Energy Accelerator Research Organization, Tsukuba, JapanA. T. H. ArceDepartment of Physics, Duke University, Durham, North Carolina, USAS. ArfaouiDepartments of Physics & Astronomy and Chemistry, Stony Brook University, Stony Brook, New York, USAJ-F. ArguinGroup of Particle Physics, University of Montreal, Montreal, Quebec, CanadaS. ArgyropoulosE. ArıkDepartment of Physics, Bogazici University, Istanbul, TurkeyM. ArikDepartment of Physics, Bogazici University, Istanbul, TurkeyA. J. ArmbrusterDepartment of Physics, The University of Michigan, Ann Arbor, Michigan, USA
2013lv
ABI
Аннотация
Two-particle correlations in relative azimuthal angle ($\ensuremath{\Delta}\ensuremath{\phi}$) and pseudorapidity ($\ensuremath{\Delta}\ensuremath{\eta}$) are measured in $\sqrt{{s}_{\mathrm{NN}}}=5.02\text{ }\text{ }\mathrm{TeV}$ $p+\mathrm{Pb}$ collisions using the ATLAS detector at the LHC. The measurements are performed using approximately $1\text{ }\text{ }\ensuremath{\mu}{\mathrm{b}}^{\ensuremath{-}1}$ of data as a function of transverse momentum (${p}_{\mathrm{T}}$) and the transverse energy ($\ensuremath{\Sigma}{E}_{\mathrm{T}}^{\mathrm{Pb}}$) summed over $3.1<\ensuremath{\eta}<4.9$ in the direction of the Pb beam. The correlation function, constructed from charged particles, exhibits a long-range ($2<|\ensuremath{\Delta}\ensuremath{\eta}|<5$) ``near-side'' ($\ensuremath{\Delta}\ensuremath{\phi}\ensuremath{\sim}0$) correlation that grows rapidly with increasing $\ensuremath{\Sigma}{E}_{\mathrm{T}}^{\mathrm{Pb}}$. A long-range ``away-side'' ($\ensuremath{\Delta}\ensuremath{\phi}\ensuremath{\sim}\ensuremath{\pi}$) correlation, obtained by subtracting the expected contributions from recoiling dijets and other sources estimated using events with small $\ensuremath{\Sigma}{E}_{\mathrm{T}}^{\mathrm{Pb}}$, is found to match the near-side correlation in magnitude, shape (in $\ensuremath{\Delta}\ensuremath{\eta}$ and $\ensuremath{\Delta}\ensuremath{\phi}$) and $\ensuremath{\Sigma}{E}_{\mathrm{T}}^{\mathrm{Pb}}$ dependence. The resultant $\ensuremath{\Delta}\ensuremath{\phi}$ correlation is approximately symmetric about $\ensuremath{\pi}/2$, and is consistent with a dominant $\mathrm{cos}2\ensuremath{\Delta}\ensuremath{\phi}$ modulation for all $\ensuremath{\Sigma}{E}_{\mathrm{T}}^{\mathrm{Pb}}$ ranges and particle ${p}_{\mathrm{T}}$.
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