Showing papers by "Kreso Kadija published in 2009"
TL;DR: In this article, the authors presented new data on the production of protons, anti-protons and neutrons in p+p interactions from a sample of 4.8 million inelastic events obtained with the NA49 detector at the CERN SPS at 158 GeV/c beam momentum.
Abstract: New data on the production of protons, anti-protons and neutrons in p+p interactions are presented. The data come from a sample of 4.8 million inelastic events obtained with the NA49 detector at the CERN SPS at 158 GeV/c beam momentum. The charged baryons are identified by energy loss measurement in a large TPC tracking system. Neutrons are detected in a forward hadronic calorimeter. Inclusive invariant cross sections are obtained in intervals from 0 to 1.9 GeV/c (0 to 1.5 GeV/c) in transverse momentum and from -0.05 to 0.95 (-0.05 to 0.4) in Feynman x for protons (anti-protons), respectively. pT integrated neutron cross sections are given in the interval from 0.1 to 0.9 in Feynman x. The data are compared to a wide sample of existing results in the SPS and ISR energy ranges as well as to proton and neutron measurements from HERA and RHIC.
75 citations
TL;DR: In this article, the energy dependence of event-by-event fluctuations in the K/pi and (p+p)/{pi) multiplicity ratios in heavy-ion collisions at the CERN SPS was investigated.
Abstract: We present measurements of the energy dependence of event-by-event fluctuations in the K/{pi} and (p+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, {radical}(s{sub 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/{pi} ratio, larger fluctuations than expected for independent particle production are found at all collision energies. The fluctuations in the (p+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 toward lower collision energies. The results are compared to transport model calculations, which fail to describe the energy dependence of the K/{pi} ratio fluctuations.
60 citations
Joint Institute for Nuclear Research1, Hungarian Academy of Sciences2, Polish Academy of Sciences3, Goethe University Frankfurt4, CERN5, Comenius University in Bratislava6, Stony Brook University7, Charles University in Prague8, Sofia University9, Max Planck Society10, Eötvös Loránd University11, GSI Helmholtz Centre for Heavy Ion Research12, Jan Kochanowski University13, Bulgarian Academy of Sciences14, Warsaw University of Technology15, National and Kapodistrian University of Athens16, University of Washington17, University of Marburg18, Massachusetts Institute of Technology19, University of Warsaw20
48 citations
TL;DR: In this article, an event-by-event analysis of transverse momenta p{sub T} in central Pb+Pb interactions at 20A, 30A, 40A, 80A, and 158A GeV is presented.
Abstract: Results are presented on event-by-event fluctuations of transverse momenta p{sub T} in central Pb+Pb interactions at 20A, 30A, 40A, 80A, and 158A GeV. The analysis was performed for charged particles at forward center-of-mass rapidity (1.1
47 citations
01 Apr 2009
Abstract: Results are presented on event-by-event fluctuations of transverse momenta pT in central Pb+Pb interactions at 20A, 30A, 40A, 80A, and 158A GeV. The analysis was performed for charged particles at forward center-of-mass rapidity (1.1 < y π < 2.6). Three fluctuation measures were studied: the distribution of average transverse momentum M(pT ) in the event, the ΦpT fluctuation measure and two-particle transverse momentum correlations. Fluctuations of pT are small and show no significant energy dependence in the energy range of the CERN Super Proton Synchrotron. Results are compared with QCD-inspired predictions for the critical point, and with the UrQMD model. Transverse momentum fluctuations, similar to multiplicity fluctuations, do not show the increase expected for freeze-out near the critical point of QCD.
4 citations
Joint Institute for Nuclear Research1, Hungarian Academy of Sciences2, Polish Academy of Sciences3, Goethe University Frankfurt4, CERN5, Comenius University in Bratislava6, Stony Brook University7, Charles University in Prague8, University of Washington9, Max Planck Society10, Eötvös Loránd University11, GSI Helmholtz Centre for Heavy Ion Research12, Jan Kochanowski University13, Bulgarian Academy of Sciences14, Warsaw University of Technology15, Sofia University16, National and Kapodistrian University of Athens17, University of Marburg18, Massachusetts Institute of Technology19, University of Warsaw20, Pusan National University21
TL;DR: Analysis of the event-by-event fluctuations of various hadronic observables reveals new results on hadron ratio fluctuations, in particular K/p fluctuations and their potential connection to the correlation between strangeness and baryon number, thus revealing the basic degrees of freedom produced in heavy-ion collisions.
1 citations
01 Jan 2009
TL;DR: In this article, the authors present a survey of the state-of-the-art methods to solve the problem of how to find the optimal solution to the problem in terms of time and space.
Abstract: N. Abgrall22, A. Aduszkiewicz23, B. Andrieu11, T. Anticic13, N. Antoniou18, J. Argyriades22, A. G. Asryan15, B. Baatar9, A. Blondel22, J. Blumer5, L. Boldizsar10, A. Bravar22, J. Brzychczyk8, A. Bubak12 S. A. Bunyatov9, K.-U. Choi12, P. Christakoglou18, P. Chung16, J. Cleymans1, D. A. Derkach15, F. Diakonos18, W. Dominik23, J. Dumarchez11, R. Engel5, A. Ereditato20, G. A. Feofilov15, Z. Fodor10, A. Ferrero22, M. Gaździcki17,21, M. Golubeva6, K. Grebieszkow24, A. Grzeszczuk12, F. Guber6, T. Hasegawa7, A. Haungs5, S. Igolkin15, A. S. Ivanov15, A. Ivashkin6, K. Kadija13, N. Katrynska8, D. Kielczewska23, D. Kikola24, J. Kisiel12 T. Kobayashi7, V. I. Kolesnikov9, D. Kolev4, R. S. Kolevatov15, V. P. Kondratiev15, S. Kowalski12 A. Kurepin6, R. Lacey16, A. Laszlo10, V. V. Lyubushkin9, Z. Majka8, A. I. Malakhov9, A. Marchionni2, A. Marcinek8, I. Maris5 V. Matveev6, G. L. Melkumov9, A. Meregaglia2, M. Messina20, P. Mijakowski14, M. Mitrovski21, T. Montaruli18,∗, St. Mrowczynski17, S. Murphy22, T. Nakadaira7, P. A. Naumenko15, V. Nikolic13, K. Nishikawa7, T. Palczewski14, G. Palla10, A. D. Panagiotou18, W. Peryt24, R. Planeta8, J. Pluta24, B. A. Popov9, M. Posiadala23, P. Przewlocki14, W. Rauch3, M. Ravonel22, R. Renfordt21, D. Rohrich19, E. Rondio14, B. Rossi20, M. Roth5, A. Rubbia2, M. Rybczynski17, A. Sadovsky6, K. Sakashita7, T. Schuster21, T. Sekiguchi7, P. Seyboth17, M. Shibata7, A. N. Sissakian9, E. Skrzypczak23, M. Slodkowski24, A. S. Sorin9, P. Staszel8, G. Stefanek17, J. Stepaniak14, C. Strabel2, H. Stroebele21, T. Susa13, I. Szentpetery10, M. Szuba24, M. Tada7, A. Taranenko16, R. Tsenov4, R. Ulrich5, M. Unger5, M. Vassiliou18, V. V. Vechernin15, G. Vesztergombi10, Z. Wlodarczyk17, A. Wojtaszek17, W. Zipper12