Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from sNN=6.3 to 17.3 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. BartkeInstitute of Nuclear Physics , Cracow , PolandL. BetevCERN , Geneva , SwitzerlandH. BiałkowskaInstitute for Nuclear Studies , Warsaw , PolandC. BlumeFachbereich Physik der Universität, Frankfurt, GermanyB. BoimskaInstitute for Nuclear Studies, Warsaw, PolandM. BotjeNikhef , Amsterdam , NetherlandsJ. BraciníkComenius University , Bratislava , SlovakiaR. BrammFachbereich Physik der Universität, Frankfurt, GermanyP. BunčcićCERN , Geneva , SwitzerlandV. ČernýComenius University , Bratislava , SlovakiaP. ChristakoglouNikhef , Amsterdam , NetherlandsO. ChválaInstitute of Particle and Nuclear Physics , Charles University , Prague , Czech RepublicJ. G. CramerNuclear Physics Laboratory , University of Washington , Seattle , Washington , 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. GładyszInstitute of Nuclear Physics , Cracow , PolandK. 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 , GermanyВ. И. КолесниковJoint Institute for Nuclear Research , Dubna , RussiaE. KornaśInstitute of Nuclear Physics , Cracow , PolandR. KorusInstitute of Physics Świetokrzyska Academy , Kielce , PolandM. KowalskiInstitute of Nuclear Physics , Cracow , PolandI. KrausGesellschaft für Schwerionenforschung (GSI), Darmstadt, GermanyM. KrepsComenius University , Bratislava , SlovakiaD. KresanGesellschaft für Schwerionenforschung (GSI) , Darmstadt , GermanyM. 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 Świ etokrzyska 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 , Washington , 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. RybickiHenryk Niewodniczanski Institute of Nuclear Physics , Polish Academy of Sciences , Cracow , PolandA. 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. Stock(The NA49 collaboration)H. StröbeleFachbereich Physik der Universität , Frankfurt , GermanyT. ŠušaRudjer Boskovic Institute , Zagreb , CroatiaI. Szentpétery(The NA49 collaboration)J. Sziklai(The NA49 collaboration)P. SzymańskiInstitute for Nuclear Studies , Warsaw , PolandV. Trubnikov(The NA49 collaboration)D. VargaCERN , Geneva , SwitzerlandM. Vassiliou(The NA49 collaboration)G. I. VeresKFKI Research Institute for Particle and Nuclear Physics , Budapest , HungaryG. VesztergombiKFKI Research Institute for Particle and Nuclear Physics , Budapest , HungaryD. Vranić(The NA49 collaboration)A. Wetzler( NA49 CollaborationZ. WłodarczykInstitute of Physics Świetokrzyska Academy , Kielce , PolandI.-K. YooDepartment of Physics , Pusan National University , Pusan , Republic of Korea
2009lv
ABI
Annotatsiya
We present measurements of the energy dependence of event-by-event fluctuations in the $K/\ensuremath{\pi}$ and $(p+\overline{p})/\ensuremath{\pi}$ multiplicity ratios in heavy-ion collisions at the CERN SPS. The particle ratio fluctuations were obtained for central $\mathrm{Pb}+\mathrm{Pb}$ collisions at five collision energies, $\sqrt{{s}_{\mathit{NN}}}$, between 6.3 and 17.3 GeV. After accounting for the effects of finite-number statistics and detector resolution, we extract the strength of nonstatistical fluctuations at each energy. For the $K/\ensuremath{\pi}$ ratio, larger fluctuations than expected for independent particle production are found at all collision energies. The fluctuations in the $(p+\overline{p})/\ensuremath{\pi}$ ratio are smaller than expectations from independent particle production, indicating correlated pion and proton production from resonance decays. For both ratios, the deviation from purely statistical fluctuations shows an increase toward lower collision energies. The results are compared to transport model calculations, which fail to describe the energy dependence of the $K/\ensuremath{\pi}$ ratio fluctuations.
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