Disappearance of Back-To-Back High-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>p</mml:mi><mml:mi>T</mml:mi></mml:msub></mml:math>Hadron Correlations in Central<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">A</mml:mi><mml:mi mathvariant="normal">u</mml:mi><mml:mo>+</mml:mo><mml:mi mathvariant="normal">A</mml:mi><mml:mi mathvariant="normal">u</mml:mi></mml:math>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>=</mml:mo><mml:mn>200</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi mathvariant="normal">G</mml:mi><mml:mi mathvariant="normal">e</mml:mi><mml:mi mathvariant="normal">V</mml:mi></mml:math>
C. AdlerUniversity of Frankfurt, Frankfurt, GermanyZ. AhammedPurdue University, West Lafayette, Indiana 47907C. AllgowerIndiana University, Bloomington, Indiana 47408J. AmonettKent State University, Kent, Ohio 44242B. D. AndersonKent State University, Kent, Ohio 44242M. AndersonUniversity of California, Davis, California 95616G. S. AverichevJ. BalewskiIndiana University, Bloomington, Indiana 47408O. BarannikovaLaboratory for High Energy (JINR), Dubna, RussiaL. S. BarnbyKent State University, Kent, Ohio 44242J. BaudotS. BekeleThe Ohio State University, Columbus, Ohio 43210V. V. BelagaR. BellwiedWayne State University, Detroit, Michigan 48201J. BergerUniversity of Frankfurt, Frankfurt, GermanyH. BichselUniversity of Washington, Seattle, Washington 98195A. BillmeierWayne State University, Detroit, Michigan 48201L. C. BlandBrookhaven National Laboratory, Upton, New York 11973C. O. BlythUniversity of Birmingham, Birmingham, United KingdomB. E. BonnerRice University, Houston, Texas 77251A. BouchamSUBATECH, Nantes, FranceA. V. BrandinMoscow Engineering Physics Institute, Moscow, RussiaA. BravarBrookhaven National Laboratory, Upton, New York 11973R. V. CadmanArgonne National Laboratory, Argonne, Illinois 60439X. Z. CaiYale University, New Haven, Connecticut 06520M. Calderon De La Barca SanchezBrookhaven National Laboratory, Upton, New York 11973Carlos CárdenasPurdue University, West Lafayette, Indiana 47907J. T. CarrollLawrence Berkeley National Laboratory, Berkeley, California 94720J. Castillo CastellanosSUBATECH, Nantes, FranceM. CastroWayne State University, Detroit, Michigan 48201D. CebraUniversity of California, Davis, California 95616P. ChaloupkaThe Ohio State University, Columbus, Ohio 43210S. ChattopadhyayWayne State University, Detroit, Michigan 48201Y. ChenUniversity of California, Los Angeles, California 90095S. ChernenkoM. CherneyCreighton University, Omaha, Nebraska 68178A. ChikanianYale University, New Haven, Connecticut 06520B. ChoiUniversity of Texas, Austin, Texas 78712W. ChristieBrookhaven National Laboratory, Upton, New York 11973J. P. CoffinT. M. CormierWayne State University, Detroit, Michigan 48201M.M. CorralMax-Planck-Institut fuer Physik, Munich, GermanyJ. G. CramerUniversity of Washington, Seattle, Washington 98195H. J. CrawfordUniversity of California, Berkeley, California 94720A. A. DerevschikovInstitute of High Energy Physics, Protvino, RussiaL. DidenkoBrookhaven National Laboratory, Upton, New York 11973T. DietelUniversity of Frankfurt, Frankfurt, GermanyJ. E. DraperUniversity of California, Davis, California 95616V. B. DuninJ. C. DunlopYale University, New Haven, Connecticut 06520V. EckardtMax-Planck-Institut fuer Physik, Munich, GermanyL. G. EfimovВ. ЕмеляновMoscow Engineering Physics Institute, Moscow, RussiaJ. EngelageUniversity of California, Berkeley, California 94720G. EppleyRice University, Houston, Texas 77251B. ErazmusSUBATECH, Nantes, FranceP. FachiniBrookhaven National Laboratory, Upton, New York 11973V. FaineBrookhaven National Laboratory, Upton, New York 11973J. FaivreR. FatemiIndiana University, Bloomington, Indiana 47408K. FilimonovLawrence Berkeley National Laboratory, Berkeley, California 94720E. FinchYale University, New Haven, Connecticut 06520Y. FisyakBrookhaven National Laboratory, Upton, New York 11973D. FlierlUniversity of Frankfurt, Frankfurt, GermanyK. J. FoleyBrookhaven National Laboratory, Upton, New York 11973J. FuInstitute of Particle Physics, CCNU (HZNU), Wuhan, 430079 ChinaC. A. GagliardiTexas A&M University, College Station, Texas 77843N. GagunashviliJ. GansYale University, New Haven, Connecticut 06520L. GaudichetSUBATECH, Nantes, FranceM. GermainF. J. M. GeurtsRice University, Houston, Texas 77251V. GhazikhanianUniversity of California, Los Angeles, California 90095O. GrachovWayne State University, Detroit, Michigan 48201V. GrigorievMoscow Engineering Physics Institute, Moscow, RussiaM. GuedonE. GushinMoscow Engineering Physics Institute, Moscow, RussiaT. J. HallmanBrookhaven National Laboratory, Upton, New York 11973D. HardtkeLawrence Berkeley National Laboratory, Berkeley, California 94720J. W. HarrisYale University, New Haven, Connecticut 06520T. W. HenryTexas A&M University, College Station, Texas 77843S. HeppelmannPennsylvania State University, University Park, Pennsylvania 16802T. HerstonPurdue University, West Lafayette, Indiana 47907B. HippolyteA. HirschPurdue University, West Lafayette, Indiana 47907E. HjortLawrence Berkeley National Laboratory, Berkeley, California 94720G. W. HoffmannUniversity of Texas, Austin, Texas 78712M. HorsleyYale University, New Haven, Connecticut 06520H. Z. HuangUniversity of California, Los Angeles, California 90095T. J. HumanicThe Ohio State University, Columbus, Ohio 43210G. IgoUniversity of California, Los Angeles, California 90095A. IshiharaUniversity of Texas, Austin, Texas 78712Yu. I. IvanshinP. JacobsLawrence Berkeley National Laboratory, Berkeley, California 94720W. W. JacobsIndiana University, Bloomington, Indiana 47408M. A. JanikWarsaw University of Technology, Warsaw, PolandI. JohnsonLawrence Berkeley National Laboratory, Berkeley, California 94720Peter G. JonesUniversity of Birmingham, Birmingham, United KingdomE. G. JuddUniversity of California, Berkeley, California 94720M. KanetaLawrence Berkeley National Laboratory, Berkeley, California 94720
2003lv
ABI
Аннотация
Azimuthal correlations for large transverse momentum charged hadrons have been measured over a wide pseudorapidity range and full azimuth in $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ and $p+p$ collisions at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$. The small-angle correlations observed in $p+p$ collisions and at all centralities of $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ collisions are characteristic of hard-scattering processes previously observed in high-energy collisions. A strong back-to-back correlation exists for $p+p$ and peripheral $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$. In contrast, the back-to-back correlations are reduced considerably in the most central $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ collisions, indicating substantial interaction as the hard-scattered partons or their fragmentation products traverse the medium.
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