Midrapidity Antiproton-to-Proton Ratio from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>A</mml:mi><mml:mi>u</mml:mi><mml:mo>+</mml:mo><mml:mi>A</mml:mi><mml:mi>u</mml:mi></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mi>NN</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:mrow></mml:msqrt></mml:mrow><mml:mrow><mml:mrow><mml:mrow/></mml:mrow></mml:mrow><mml:mspace/><mml:mo>=</mml:mo><mml:mspace/><mml:mn>130</mml:mn><mml:mn/><mml:mi/><mml:mi>GeV</mml:mi></mml:math>
C. AdlerUniversity of Frankfurt, Frankfurt, GermanyZ. AhammedPurdue University, West Lafayette, Indiana 47907C. AllgowerIndiana University, Bloomington, Indiana 47408M. 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. BekeleOhio State University, Columbus, Ohio 43210V. V. BelagaR. BellwiedWayne State University, Detroit, Michigan 48201J. BergerUniversity of Frankfurt, Frankfurt, GermanyH. BichselUniversity of Washington, Seattle, Washington 98185L. C. BlandIndiana University, Bloomington, Indiana 47408C. O. BlythUniversity of Birmingham, Birmingham, United KingdomB. E. BonnerRice University, Houston, Texas 77251V. SinghLawrence Berkeley National Laboratory, Berkeley, California 94720A. BouchamSUBATECH, Nantes, FranceA. V. BrandinMoscow Engineering Physics Institute, Moscow, RussiaX. Z. CaiOhio State University, Columbus, Ohio 43210M. Calderon De La Barca SanchezYale University, New Haven, Connecticut 06520Carlos CárdenasPurdue University, West Lafayette, Indiana 47907J. CarrollLawrence Berkeley National Laboratory, Berkeley, California 94720J. Castillo CastellanosSUBATECH, Nantes, FranceM. CastroWayne State University, Detroit, Michigan 48201D. CebraUniversity of California, Davis, California 95616S. ChattopadhyayWayne State University, Detroit, Michigan 48201M. L. ChenBrookhaven National Laboratory, Upton, New York 11973Y. 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. CoffinL. ConinSUBATECH, Nantes, FranceT. M. CormierWayne State University, Detroit, Michigan 48201J. G. CramerUniversity of Washington, Seattle, Washington 98185H. J. CrawfordUniversity of California, Berkeley, California 94720M. DeMelloRice University, Houston, Texas 77251W. S. DengKent State University, Kent, Ohio 44242A. A. DerevschikovInstitute of High Energy Physics, Protvino, RussiaL. DidenkoBrookhaven National Laboratory, Upton, New York 11973J. E. DraperUniversity of California, Davis, California 95616V. B. DuninJ. C. DunlopYale University, New Haven, Connecticut 06520V. EckardtMax-Planck-Institut für 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. FachiniUniversidade de Sao Paulo, Sao Paulo, BrazilM.I. FergusonUniversity of California, Los Angeles, California 90095E. 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 11973N. GagunashviliJ. GansYale University, New Haven, Connecticut 06520M. GermainF. J. M. GeurtsRice University, Houston, Texas 77251V. GhazikhanianUniversity of California, Los Angeles, California 90095Jakub Krzysztof GrabskiWarsaw University of Technology, Warsaw, PolandO. GrachovWayne State University, Detroit, Michigan 48201D. GreinerLawrence Berkeley National Laboratory, Berkeley, California 94720V. GrigorievMoscow Engineering Physics Institute, Moscow, RussiaE. 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 06520M. HeffnerUniversity of California, Davis, California 95616S. HeppelmannPennsylvania State University, University Park, Pennsylvania 16802T. HerstonPurdue University, West Lafayette, Indiana 47907B. HippolyteA. HirschPurdue University, West Lafayette, Indiana 47907E. HjortPurdue University, West Lafayette, Indiana 47907G. W. HoffmannUniversity of Texas, Austin, Texas 78712M. HorsleyYale University, New Haven, Connecticut 06520H. Z. HuangUniversity of California, Los Angeles, California 90095T. J. HumanicOhio State University, Columbus, Ohio 43210Holm Gero HümmlerMax-Planck-Institut für Physik, Munich, GermanyG. 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 94720M. KaplanCarnegie Mellon University, Pittsburgh, Pennsylvania 15213D. KeaneKent State University, Kent, Ohio 44242A. KhodinovMoscow Engineering Physics Institute, Moscow, RussiaA. KisielWarsaw University of Technology, Warsaw, PolandJ. KlayUniversity of California, Davis, California 95616S. R. KleinLawrence Berkeley National Laboratory, Berkeley, California 94720A. KlyachkoIndiana University, Bloomington, Indiana 47408
2001lv
ABI
Abstract
We report results on the ratio of midrapidity antiproton-to-proton yields in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{\mathrm{NN}}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}130\mathrm{GeV}$ per nucleon pair as measured by the STAR experiment at RHIC. Within the rapidity and transverse momentum range of $|y|<0.5$ and $0.4<{p}_{t}<1.0\mathrm{GeV}/c$, the ratio is essentially independent of either transverse momentum or rapidity, with an average of $0.65\ifmmode\pm\else\textpm\fi{}{0.01}_{(\mathrm{stat})}\ifmmode\pm\else\textpm\fi{}{0.07}_{(\mathrm{syst})}$ for minimum bias collisions. Within errors, no strong centrality dependence is observed. The results indicate that at this RHIC energy, although the $p\ensuremath{-}\overline{p}$ pair production becomes important at midrapidity, a significant excess of baryons over antibaryons is still present.
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Cited by 20 references