Charged-Particle Pseudorapidity Density Distributions 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: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:mspace/><mml:mo>=</mml:mo><mml:mspace/><mml:mn>130</mml:mn><mml:mn/><mml:mi/><mml:mi>GeV</mml:mi></mml:math>
B. B. BackPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843, USAM. D. BakerChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000D. S. BartonChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000R. R. BettsDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059R. BindelDepartment of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742A. BudzanowskiInstitute of Nuclear Physics, Kraków, PolandW. BuszaLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307A. CarrollChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000M. P. DecowskiLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307E. Garcı́aDepartment of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742N. GeorgePhysics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843K. GulbrandsenLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307S. GushueChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000C. HalliwellDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059G. A. HeintzelmanChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000C. HendersonLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307D. J. HofmanDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059R. HołyńskiInstitute of Nuclear Physics, Kraków, PolandB. HolzmanChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000E. JohnsonDepartment of Physics and Astronomy, University of Rochester, Rochester, New York 14627J. L. KaneLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307J. KatzyLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307N. KhanDepartment of Physics and Astronomy, University of Rochester, Rochester, New York 14627W. KucewiczDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059P. KulinichLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307W.T. LinDepartment of Physics, National Central University, Chung-Li, TaiwanS. ManlyDepartment of Physics and Astronomy, University of Rochester, Rochester, New York 14627D. McLeodDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059J. MichałowskiInstitute of Nuclear Physics, Kraków, PolandA. C. MignereyDepartment of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742J. MülmenstädtLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307R. NouicerDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059A. OlszewskiChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000R. PakChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000I. C. ParkDepartment of Physics and Astronomy, University of Rochester, Rochester, New York 14627H. PerneggerLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307Catherine L. ReedLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307L. P. RemsbergChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000M. ReuterDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059C. RolandLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307G. RolandLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307L. J. RosenbergLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307Pankaj SarinLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307P. SawickiInstitute of Nuclear Physics, Kraków, PolandW. SkulskiDepartment of Physics and Astronomy, University of Rochester, Rochester, New York 14627S. G. SteadmanLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307P. SteinbergChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000G. S. F. StephansLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307M. StodulskiInstitute of Nuclear Physics, Kraków, PolandA. SukhanovChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000J.-L. TangDepartment of Physics, National Central University, Chung-Li, TaiwanR. TengDepartment of Physics and Astronomy, University of Rochester, Rochester, New York 14627A. TrzupekInstitute of Nuclear Physics, Kraków, PolandC. ValeLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307G. J. van NieuwenhuizenLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307R. VerdierLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307B. WadsworthLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307F. L. H. WolfsDepartment of Physics and Astronomy, University of Rochester, Rochester, New York 14627B. K. WosiekInstitute of Nuclear Physics, Kraków, PolandK. W. WoźniakInstitute of Nuclear Physics, Kraków, PolandA. H. WuosmaaPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843B. WysłouchLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307
2001lv
ABI
Аннотация
The charged-particle pseudorapidity density ${\mathrm{dN}}_{\mathrm{ch}}/d\ensuremath{\eta}$ has been measured for $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{\mathrm{NN}}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}130\mathrm{GeV}$ at RHIC, using the PHOBOS apparatus. The total number of charged particles produced for the $3%$ most-central $\mathrm{Au}+\mathrm{Au}$ collisions for $|\ensuremath{\eta}|\ensuremath{\le}5.4$ is found to be $4200\ifmmode\pm\else\textpm\fi{}470$. The evolution of ${\mathrm{dN}}_{\mathrm{ch}}/d\ensuremath{\eta}$ with centrality is discussed, and compared to model calculations and to data from proton-induced collisions. The data show an enhancement in charged-particle production at midrapidity, while in the fragmentation regions, the results are consistent with expectations from $\mathrm{pp}$ and $\mathrm{pA}$ scattering.
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