Significance of the Fragmentation Region in Ultrarelativistic Heavy-Ion Collisions
B. B. BackPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843, USAM. D. BakerChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000, USAD. S. BartonChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000, USAR. R. BettsDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059, USAM. BallintijnLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAA. A. BickleyDepartment of Chemistry, University of Maryland, College Park, Maryland 20742, USAR. BindelDepartment of Chemistry, University of Maryland, College Park, Maryland 20742, USAA. BudzanowskiInstitute of Nuclear Physics, Kraków, PolandW. BuszaLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAA. CarrollChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000, USAM. P. DecowskiLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAE. Garcı́aDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059, USAN. GeorgeChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000, USAK. GulbrandsenLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAS. GushueChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000, USAC. HalliwellDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059, USAJ. HamblenDepartment of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USAG. A. HeintzelmanChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000, USAC. HendersonLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAD. J. HofmanDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059, USAR. S. HollisDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059, USAR. HołyńskiInstitute of Nuclear Physics, Kraków, PolandB. HolzmanChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000, USAA. IordanovaDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059, USAE. JohnsonDepartment of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USAJ. L. KaneLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAJ. KatzyDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059, USAN. KhanDepartment of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USAW. KucewiczDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059, USAP. KulinichLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAC. M. KuoDepartment of Physics, National Central University, Chung-Li, TaiwanW.T. LinDepartment of Physics, National Central University, Chung-Li, TaiwanS. ManlyDepartment of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USAD. McLeodDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059, USAJ. MichałowskiInstitute of Nuclear Physics, Kraków, PolandA. C. MignereyDepartment of Chemistry, University of Maryland, College Park, Maryland 20742, USAR. NouicerDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059, USAA. OlszewskiChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000, USAR. PakChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000, USAI. C. ParkDepartment of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USAH. PerneggerLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAC. ReedLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAL. P. RemsbergChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000, USAM. ReuterDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059, USAC. RolandLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAG. RolandLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAL. J. RosenbergLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAJ. SagererDepartment of Physics, University of Illinois at Chicago, Chicago, Illinois 60607-7059, USAPankaj SarinLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAP. SawickiInstitute of Nuclear Physics, Kraków, PolandW. SkulskiDepartment of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USAS. G. SteadmanLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAP. SteinbergChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000, USAG. S. F. StephansLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAM. StodulskiInstitute of Nuclear Physics, Kraków, PolandA. SukhanovChemistry and C-A Departments, Brookhaven National Laboratory, Upton, New York 11973-5000, USAJ.-L. TangDepartment of Physics, National Central University, Chung-Li, TaiwanR. TengDepartment of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USAA. TrzupekInstitute of Nuclear Physics, Kraków, PolandC. ValeLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAG. J. van NieuwenhuizenLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAR. VerdierLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAB. WadsworthLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAF. L. H. WolfsDepartment of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USAB. K. WosiekInstitute of Nuclear Physics, Kraków, PolandK. W. WoźniakInstitute of Nuclear Physics, Kraków, PolandA. H. WuosmaaPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843, USAB. WysłouchLaboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
2003en
ABI
Аннотация
We present measurements of the pseudorapidity distribution of primary charged particles produced in $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ collisions at three energies, $\sqrt{{s}_{NN}}=19.6$, 130, and 200 GeV, for a range of collision centralities. The distribution narrows for more central collisions and excess particles are produced at high pseudorapidity in peripheral collisions. For a given centrality, however, the distributions are found to scale with energy according to the ``limiting fragmentation'' hypothesis. The universal fragmentation region described by this scaling grows in pseudorapidity with increasing collision energy, extending well away from the beam rapidity and covering more than half of the pseudorapidity range over which particles are produced. This approach to a universal limiting curve appears to be a dominant feature of the pseudorapidity distribution and therefore of the total particle production in these collisions.
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