Energy and centrality dependence of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mover><mml:mrow><mml:mi>p</mml:mi></mml:mrow><mml:mrow><mml:mrow/><mml:mo>¯</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:math>and<i>p</i>production and the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mover><mml:mrow><mml:mi>Λ</mml:mi></mml:mrow><mml:mrow><mml:mrow/><mml:mo>¯</mml:mo></mml:mrow></mml:mover><mml:mo>/</mml:mo><mml:mover><mml:mrow><mml:mi>p</mml:mi></mml:mrow><mml:mrow><mml:mrow/><mml:mo>¯</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:math>ratio in Pb+Pb collisions between 20<i>A</i>GeV and 158<i>A</i>GeV
C. AltFachbereich Physik der Universität, Frankfurt, GermanyT. AnticicRudjer Boskovic Institute, Zagreb, CroatiaB. BaatarJoint Institute for Nuclear Research, Dubna, RussiaD. BarnaKFKI Research Institute for Particle and Nuclear Physics, Budapest, HungaryJ. BartkeL. BetevCERN, Geneva, SwitzerlandH. BiałkowskaC. BlumeFachbereich Physik der Universität, Frankfurt, GermanyB. BoimskaM. BotjeNIKHEF, Amsterdam, NetherlandsJ. BraciníkComenius University, Bratislava, SlovakiaR. BrammFachbereich Physik der Universität, Frankfurt, GermanyP. BunčićCERN, Geneva, SwitzerlandV. ČernýComenius University, Bratislava, SlovakiaP. ChristakoglouDepartment of Physics, University of Athens, Athens, GreeceO. ChválaInstitute of Particle and Nuclear Physics, Charles University, Prague, Czech RepublicJ. G. CramerNuclear Physics Laboratory, University of Washington, Seattle, WA, USAP. CsatóKFKI Research Institute for Particle and Nuclear Physics, Budapest, HungaryP. DinkelakerFachbereich Physik der Universität, Frankfurt, GermanyV. EckardtMax-Planck-Institut für Physik, Munich, GermanyD. FlierlFachbereich Physik der Universität, Frankfurt, GermanyZ. FodorKFKI Research Institute for Particle and Nuclear Physics, Budapest, HungaryP. FokaGesellschaft für Schwerionenforschung (GSI), Darmstadt, GermanyV. FrieseGesellschaft für Schwerionenforschung (GSI), Darmstadt, GermanyJ. GálKFKI Research Institute for Particle and Nuclear Physics, Budapest, HungaryM. GaździckiFachbereich Physik der Universität, Frankfurt, GermanyV. GenchevInstitute for Nuclear Research and Nuclear Energy, Sofia, BulgariaG. GeorgopoulosDepartment of Physics, University of Athens, Athens, GreeceE. GładyszK. GrebieszkowInstitute for Experimental Physics, University of Warsaw, Warsaw, PolandS. HegyiKFKI Research Institute for Particle and Nuclear Physics, Budapest, HungaryC. HöhneGesellschaft für Schwerionenforschung (GSI), Darmstadt, GermanyK. KadijaRudjer Boskovic Institute, Zagreb, CroatiaA. KarevMax-Planck-Institut für Physik, Munich, GermanyM. KliemantFachbereich Physik der Universität, Frankfurt, GermanyS. KniegeFachbereich Physik der Universität, Frankfurt, GermanyV. I. KolesnikovJoint Institute for Nuclear Research, Dubna, RussiaE. KornaśR. KorusInstitute of Physics Świetokrzyska Academy, Kielce, PolandM. KowalskiI. KrausGesellschaft für Schwerionenforschung (GSI), Darmstadt, GermanyM. KrepsComenius University, Bratislava, SlovakiaA. LasloKFKI Research Institute for Particle and Nuclear Physics, Budapest, HungaryM. van LeeuwenNIKHEF, Amsterdam, NetherlandsP. LévaiKFKI Research Institute for Particle and Nuclear Physics, Budapest, HungaryL. LitovAtomic Physics Department, Sofia University, St. Kliment Ohridski, Sofia, BulgariaB. LungwitzFachbereich Physik der Universität, Frankfurt, GermanyM. MakarievAtomic Physics Department, Sofia University, St. Kliment Ohridski, Sofia, BulgariaA. MalakhovJoint Institute for Nuclear Research, Dubna, RussiaM. MateevAtomic Physics Department, Sofia University, St. Kliment Ohridski, Sofia, BulgariaG. L. MelkumovJoint Institute for Nuclear Research, Dubna, RussiaA. MischkeNIKHEF, Amsterdam, NetherlandsM. MitrovskiFachbereich Physik der Universität, Frankfurt, GermanyJ. MolnárKFKI Research Institute for Particle and Nuclear Physics, Budapest, HungaryStanisław MrówczyńskiInstitute of Physics Świetokrzyska Academy, Kielce, PolandV. NicolicRudjer Boskovic Institute, Zagreb, CroatiaG. PállaKFKI Research Institute for Particle and Nuclear Physics, Budapest, HungaryA. D. PanagiotouDepartment of Physics, University of Athens, Athens, GreeceD. PanayotovAtomic Physics Department, Sofia University, St. Kliment Ohridski, Sofia, BulgariaA. PetridisDepartment of Physics, University of Athens, Athens, GreeceM. PiknaComenius University, Bratislava, SlovakiaD. PrindleNuclear Physics Laboratory, University of Washington, Seattle, WA, USAF. PühlhoferFachbereich Physik der Universität, Marburg, GermanyR. RenfordtFachbereich Physik der Universität, Frankfurt, GermanyC. RolandMIT, Cambridge, Massachusetts, USAG. RolandMIT, Cambridge, Massachusetts, USAM. RybczyńskiInstitute of Physics Świetokrzyska Academy, Kielce, PolandA. RybickiCERN, Geneva, SwitzerlandA. SandovalGesellschaft für Schwerionenforschung (GSI), Darmstadt, GermanyN. SchmitzMax-Planck-Institut für Physik, Munich, GermanyT. SchusterFachbereich Physik der Universität, Frankfurt, GermanyP. SeybothMax-Planck-Institut für Physik, Munich, GermanyF. SiklérKFKI Research Institute for Particle and Nuclear Physics, Budapest, HungaryB. SitárComenius University, Bratislava, SlovakiaE. SkrzypczakInstitute for Experimental Physics, University of Warsaw, Warsaw, PolandG. StefanekInstitute of Physics Świetokrzyska Academy, Kielce, PolandR. StockFachbereich Physik der Universität, Frankfurt, GermanyC. StrabelFachbereich Physik der Universität, Frankfurt, GermanyH. StröbeleFachbereich Physik der Universität, Frankfurt, GermanyT. ŠušaRudjer Boskovic Institute, Zagreb, CroatiaI. SzentpéteryKFKI Research Institute for Particle and Nuclear Physics, Budapest, HungaryJ. SziklaiKFKI Research Institute for Particle and Nuclear Physics, Budapest, HungaryP. SzymańskiCERN, Geneva, SwitzerlandVictor TrubnikovD. VargaCERN, Geneva, SwitzerlandM. VassiliouDepartment of Physics, University of Athens, Athens, GreeceG. I. VeresKFKI Research Institute for Particle and Nuclear Physics, Budapest, HungaryG. VesztergombiKFKI Research Institute for Particle and Nuclear Physics, Budapest, HungaryD. VranićGesellschaft für Schwerionenforschung (GSI), Darmstadt, GermanyA. WetzlerFachbereich Physik der Universität, Frankfurt, GermanyZ. WłodarczykInstitute of Physics Świetokrzyska Academy, Kielce, PolandI.-K. YooDepartment of Physics, Pusan National University, Pusan, Republic of KoreaJ. ZimànýiKFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary
2006lv
ABI
Аннотация
The transverse mass ${m}_{t}$ distributions for antiprotons are measured at midrapidity for minimum bias Pb+Pb collisions at 158A GeV and for central Pb+Pb collisions at 20A, 30A, 40A, and 80A GeV beam energies in the fixed target experiment NA49 at the CERN SPS. The rapidity density $\mathit{dn}/\mathit{dy}$, inverse slope parameter T, and mean transverse mass $\ensuremath{\langle}{m}_{t}\ensuremath{\rangle}$ derived from the ${m}_{t}$ distributions are studied as a function of the incident energy and the collision centrality and compared to the relevant data on proton production. The shapes of the ${m}_{t}$ distributions of $\overline{p}$ and p are very similar. The ratios of the particle yields, $\overline{p}$/p and $\overline{\ensuremath{\Lambda}}$/$\overline{p}$, are also analyzed. The $\overline{p}$/p ratio exhibits an increase with decreasing centrality and a steep rise with increasing beam energy. The $\overline{\ensuremath{\Lambda}}$/$\overline{p}$ ratio increases beyond unity with decreasing beam energy.
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