001119866 001__ 1119866
001119866 003__ SzGeCERN
001119866 005__ 20240307045848.0
001119866 0247_ $$2DOI$$a10.1103/PhysRevC.79.044910
001119866 0248_ $$aoai:cds.cern.ch:1119866$$pcerncds:FULLTEXT$$pcerncds:CERN:FULLTEXT$$pcerncds:CERN
001119866 037__ $$9arXiv$$aarXiv:0808.1237$$cnucl-ex
001119866 035__ $$9arXiv$$aoai:arXiv.org:0808.1237
001119866 035__ $$9SPIRES$$a7862890
001119866 035__ $$9Inspire$$a792773
001119866 041__ $$aeng
001119866 100__ $$aAlt, C.$$uFrankfurt U.
001119866 245__ $$aEnergy dependence of particle ratio fluctuations in central Pb+Pb collisions from $\sqrt{s_{_{NN}}} =$~6.3 to 17.3 GeV
001119866 269__ $$c11 Aug 2008
001119866 260__ $$c2009
001119866 300__ $$a11 p
001119866 500__ $$aComments: 11 pages, 8 figures
001119866 500__ $$9arXiv$$a11 pages, 10 figures, update to published version
001119866 520__ $$aWe present recent measurements of the energy dependence of event-by-event fluctuations in the $K/pi$ and $(p + \bar{p})/pi$ multiplicity ratios in heavy ion collisions at the CERN SPS. The particle ratio fluctuations were obtained for central Pb+Pb collisions at five collision energies, $\sqrt{s_{_{NN}}}$, between 6.3 and 17.3 GeV. After accounting for the effects of finite-number statistics and detector resolution, we extract the strength of non-statistical fluctuations at each energy. For the $K/pi$ ratio, larger fluctuations than expected for independent particle production are found at all collision energies. The fluctuations in the $(p + \bar{p})/pi$ 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 towards lower collision energies. The results are compared to transport model calculations, which fail to describe the energy dependence of the $K/pi$ ratio fluctuations.
001119866 520__ $$9arXiv$$aWe present measurements of the energy dependence of event-by-event fluctuations in the K/pi and (p + \bar{p})/pi multiplicity ratios in heavy ion collisions at the CERN SPS. The particle ratio fluctuations were obtained for central Pb+Pb collisions at five collision energies, \sqrt{s_{_{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 non-statistical fluctuations at each energy. For the K/pi ratio, larger fluctuations than expected for independent particle production are found at all collision energies. The fluctuations in the (p + \bar{p})/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 towards lower collision energies. The results are compared to transport model calculations, which fail to describe the energy dependence of the K/pi ratio fluctuations.
001119866 540__ $$barXiv$$uhttp://arxiv.org/licenses/nonexclusive-distrib/1.0/
001119866 595__ $$agiva
001119866 595__ $$aLANL EDS
001119866 65017 $$2SzGeCERN$$aNuclear Physics - Experiment
001119866 693__ $$aCERN SPS$$eNA49
001119866 690C_ $$aARTICLE
001119866 690C_ $$aCERN
001119866 695__ $$9LANL EDS$$anucl-ex$$aNuclear Experiment
001119866 700__ $$aAnticic, T.$$uBoskovic Inst., Zagreb
001119866 700__ $$aBaatar, B.$$uDubna, JINR
001119866 700__ $$aBarna, D.$$uBudapest, RMKI
001119866 700__ $$aBartke, J.$$uCracow, INP
001119866 700__ $$aBetev, L.$$uCERN
001119866 700__ $$aBialkowska, H.$$uWarsaw, Inst. Nucl. Studies
001119866 700__ $$aBlume, C.$$uFrankfurt U.
001119866 700__ $$aBoimska, B.$$uWarsaw, Inst. Nucl. Studies
001119866 700__ $$aBotje, M.$$uNikhef, Amsterdam
001119866 700__ $$aBracinik, J.$$uComenius U.
001119866 700__ $$aBramm, R.$$uDarmstadt, GSI
001119866 700__ $$aBuncic, P.$$uCERN
001119866 700__ $$aCerny, V.$$uComenius U.
001119866 700__ $$aChristakoglou, P.$$uAthens U.
001119866 700__ $$aChvala, O.$$uCharles U.
001119866 700__ $$aCramer, J.G.$$uWashington U., Seattle
001119866 700__ $$aCsato, P.$$uBudapest, RMKI
001119866 700__ $$aDinkelaker, P.$$uFrankfurt U.
001119866 700__ $$aEckardt, V.$$uMunich, Max Planck Inst.
001119866 700__ $$aFlierl, D.$$uFrankfurt U.
001119866 700__ $$aFodor, Z.$$uBudapest, RMKI
001119866 700__ $$aFoka, P.$$uDarmstadt, GSI
001119866 700__ $$aFriese, V.$$uDarmstadt, GSI
001119866 700__ $$aGal, J.$$uBudapest, RMKI
001119866 700__ $$aGazdzicki, M.$$uJan Kochanowski U.$$uFrankfurt U.
001119866 700__ $$aGenchev, V.$$uSofiya, Inst. Nucl. Res.
001119866 700__ $$aGeorgopoulos, G.$$uAthens U.
001119866 700__ $$aGladysz, E.$$uCracow, INP
001119866 700__ $$aGrebieszkow, K.$$uWarsaw U. of Tech.
001119866 700__ $$aHegyi, S.$$uBudapest, RMKI
001119866 700__ $$aHohne, C.$$uDarmstadt, GSI
001119866 700__ $$aKadija, K.$$uBoskovic Inst., Zagreb
001119866 700__ $$aKarev, A.$$uMunich, Max Planck Inst.
001119866 700__ $$aKliemant, M.$$uFrankfurt U.
001119866 700__ $$aKniege, S.$$uFrankfurt U.
001119866 700__ $$aKolesnikov, V.I.$$uDubna, JINR
001119866 700__ $$aKornas, E.$$uCracow, INP
001119866 700__ $$aKorus, R.$$uJan Kochanowski U.
001119866 700__ $$aKowalski, M.$$uCracow, INP
001119866 700__ $$aKraus, I.$$uDarmstadt, GSI
001119866 700__ $$aKreps, M.$$uComenius U.
001119866 700__ $$aKresan, D.$$uDarmstadt, GSI
001119866 700__ $$avan Leeuwen, M.$$uNikhef, Amsterdam
001119866 700__ $$aLevai, P.$$uBudapest, RMKI
001119866 700__ $$aLitov, L.$$uCatania U.
001119866 700__ $$aLungwitz, B.$$uFrankfurt U.
001119866 700__ $$aMakariev, M.$$uSofiya U.
001119866 700__ $$aMalakhov, A.I.$$uDubna, JINR
001119866 700__ $$aMateev, M.$$uSofiya U.
001119866 700__ $$aMelkumov, G.L.$$uDubna, JINR
001119866 700__ $$aMischke, A.$$uNikhef, Amsterdam
001119866 700__ $$aMitrovski, M.$$uFrankfurt U.
001119866 700__ $$aMolnar, J.$$uBudapest, RMKI
001119866 700__ $$aMrowczynski, St.$$uJan Kochanowski U.
001119866 700__ $$aNicolic, V.$$uBoskovic Inst., Zagreb
001119866 700__ $$aPalla, G.$$uBudapest, RMKI
001119866 700__ $$aPanagiotou, A.D.$$uAthens U.
001119866 700__ $$aPanayotov, D.$$uCatania U.
001119866 700__ $$aPetridis, A.$$uAthens U.
001119866 700__ $$aPikna, M.$$uComenius U.
001119866 700__ $$aPrindle, D.$$uWashington U., Seattle
001119866 700__ $$aPuhlhofer, F.$$uPhilipps U. Marburg
001119866 700__ $$aRenfordt, R.$$uFrankfurt U.
001119866 700__ $$aRoland, C.$$uMIT
001119866 700__ $$aRoland, G.$$uMIT
001119866 700__ $$aRybczynski, M.$$uJan Kochanowski U.
001119866 700__ $$aRybicki, A.$$uCracow, INP
001119866 700__ $$aSandoval, A.$$uDarmstadt, GSI
001119866 700__ $$aSchmitz, N.$$uMunich, Max Planck Inst.
001119866 700__ $$aSchuster, T.$$uFrankfurt U.
001119866 700__ $$aSeyboth, P.$$uMunich, Max Planck Inst.
001119866 700__ $$aSikler, F.$$uBudapest, RMKI
001119866 700__ $$aSitar, B.$$uComenius U.
001119866 700__ $$aSkrzypczak, E.$$uWarsaw U.
001119866 700__ $$aStefanek, G.$$uJan Kochanowski U.
001119866 700__ $$aStock, R.$$uFrankfurt U.
001119866 700__ $$aStrobele, H.$$uFrankfurt U.
001119866 700__ $$aSusa, T.$$uBoskovic Inst., Zagreb
001119866 700__ $$aSzentpetery, I.$$uBudapest, RMKI
001119866 700__ $$aSziklai, J.$$uBudapest, RMKI
001119866 700__ $$aSzymanski, P.$$uWarsaw, Inst. Nucl. Studies$$uCERN
001119866 700__ $$aTrubnikov, V.$$uWarsaw, Inst. Nucl. Studies
001119866 700__ $$aVarga, D.$$uCERN$$uBudapest, RMKI
001119866 700__ $$aVassiliou, M.$$iINSPIRE-00246199$$uAthens U.
001119866 700__ $$aVeres, G.I.$$uMIT$$uBudapest, RMKI
001119866 700__ $$aVesztergombi, G.$$uBudapest, RMKI
001119866 700__ $$aVranic, D.$$uDarmstadt, GSI
001119866 700__ $$aWetzler, A.$$uFrankfurt U.
001119866 700__ $$aWlodarczyk, Z.$$uJan Kochanowski U.
001119866 700__ $$aYoo, I.K.$$uPusan Natl. U.
001119866 700__ $$aZimanyi, J.$$uBudapest, RMKI
001119866 710__ $$gNA49 Collaboration
001119866 710__ $$5PH-EP
001119866 773__ $$c044910$$pPhys. Rev. C$$v79$$y2009
001119866 8564_ $$uhttp://arxiv.org/pdf/0808.1237.pdf$$yPreprint
001119866 8564_ $$8496043$$s556675$$uhttps://cds.cern.ch/record/1119866/files/GetPDFServlet9.pdf$$yAPS Published version, local copy
001119866 8564_ $$82293955$$s14230$$uhttps://cds.cern.ch/record/1119866/files/Fig6_20080807.png$$y00006 Caption not extracted
001119866 8564_ $$82293956$$s356314$$uhttps://cds.cern.ch/record/1119866/files/arXiv:0808.1237.pdf
001119866 8564_ $$82293957$$s15957$$uhttps://cds.cern.ch/record/1119866/files/Fig8_20090119.png$$y00008 Caption not extracted
001119866 8564_ $$82293958$$s14973$$uhttps://cds.cern.ch/record/1119866/files/Fig7_20090119.png$$y00007 Expanded view of the low \ktopi\ ratio region of the event-by-event \ktopi\ ratio distribution of the $\roots = 6.3$~GeV data set for data (points) and mixed events (histogram).Caption not extracted
001119866 8564_ $$82293959$$s32988$$uhttps://cds.cern.ch/record/1119866/files/Fig4_20090117.png$$y00004 (Left) Distributions of the event-by-event \ktopi\ ratio for data (points) and mixed events (histogram), for all five collision energies. (Right) Distributions of the event-by-event \ptopi\ ratio for data (points) and mixed events (histogram), for all five collision energies. No acceptance corrections were applied to the particle ratios shown.
001119866 8564_ $$82293960$$s24508$$uhttps://cds.cern.ch/record/1119866/files/Fig9_20090117.png$$y00009 Results of various studies on systematic uncertainties in the determination of $\sigma_{dyn}(K/\pi)$: (a) extraction of $\sigma_{dyn}$ using equation~2. (b) \dedx\ fit versus particle counting in UrQMD. (c) removal of tails of event-by-event distributions. (d) variation of \dedx\ width scaling. (e) variation of track quality cuts. (f) variation of $p_{tot}$ cutoff. Shaded bands indicate the contribution to the systematic error for \ktopi\ fluctuations. Where applicable, dashed lines indicate corresponding contribution to systematic error for \ptopi\ fluctuations. See text for details.
001119866 8564_ $$82293961$$s26403$$uhttps://cds.cern.ch/record/1119866/files/Fig3_20070327.png$$y00003 (Top) Event-averaged \dedx\ distributions (symbols) compared to the extracted \dedx\ probability density functions (solid lines) for protons, kaons, pions and the sum of all particles. For all energies, data distributions and projected PDFs are shown for a narrow momentum range ($\Delta p_{tot} \approx 1$~GeV/c) for $200~\mbox{MeV/c} < p_T < 400~\mbox{MeV/c}$, close to $y = 0$ assuming kaon mass. (Bottom) Fit residuals for the sum of \dedx\ probability density functions shown in the upper panels.
001119866 8564_ $$82293962$$s34486$$uhttps://cds.cern.ch/record/1119866/files/Fig1_20080808.png$$y00000 (Color online) The experimental set--up of the NA49 experiment \protect\cite{na49_nim} and target arrangement (a) for Pb+Pb collisions.
001119866 8564_ $$82293963$$s16958$$uhttps://cds.cern.ch/record/1119866/files/Fig5_20090113.png$$y00005 Difference between measured and input \ktopi\ ratio versus average input \ktopi\ ratio for mixed events, showing that the event-by-event fit is linear with respect to the input ratio.Caption not extracted
001119866 8564_ $$82293964$$s18589$$uhttps://cds.cern.ch/record/1119866/files/Fig10_20090203.png$$y00010 (Color online) Energy dependence of the event-by-event non-statistical fluctuations of the \ktopi\ ratio (top panel) and the \ptopi\ ratio (bottom panel). Filled symbols show data, open symbols show calculations with the UrQMD transport code, using NA49 acceptance tables. Systematic uncertainties are shown as brackets. Data of the STAR collaboration are taken from \cite{star_k2pi}.
001119866 8564_ $$82293965$$s81110$$uhttps://cds.cern.ch/record/1119866/files/Fig2_20080807.png$$y00002 Phase-space distributions of charged particles used for the fluctuation analysis at all collision energies, from $\roots\ \mbox {= 6.3}$ to 17.3~GeV. Data are shown using pion, kaon and proton mass. The solid line indicates the 3~GeV/c cutoff in total lab momentum. The dashed line indicates cutoffs at each energy that were used for the study of acceptance effects (see text).
001119866 8564_ $$82516074$$s9563$$uhttps://cds.cern.ch/record/1119866/files/fig00001.png$$y00001 noimgDetails of the data sets used in this analysis. For all data sets, the 3.5\% most central events were selected. $y_{CMS}$ is the beam rapidity in the collision center-of-mass frame. The two numbers of tracks/event refer to the strict and loose track quality cuts (see text).
001119866 916__ $$sn$$w200832$$ya2009
001119866 960__ $$a13
001119866 961__ $$c20100422$$h1642$$lCER01$$x20080811
001119866 963__ $$aPUBLIC
001119866 970__ $$a002772141CER
001119866 980__ $$aARTICLE