Author: "Hegyi, S." - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"Hegyi, S."' showing total 464 results

Start Over Author "Hegyi, S."

Sorry, I don't understand your search. ×

464 results on '"Hegyi, S."'

101. Bose-Einstein or HBT correlations and the anomalous dimension of QCD

Author: Tamas Csorgo, Hegyi, S., Novák, T., and Zajc, W. A.
Subjects: Nuclear Theory (nucl-th), Condensed Matter::Quantum Gases, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Nuclear Theory, High Energy Physics::Lattice, Experimental High Energy Physics, FOS: Physical sciences, High Energy Physics::Experiment
Abstract: Bose-Einstein (or HBT) correlation functions are evaluated for the fractal structure of QCD jets. These correlation functions have a stretched exponential (or Levy-stable) form. The anomalous dimension of QCD determines the Levy index of stability, thus the running coupling constant of QCD becomes measurable with the help of two-particle Bose-Einstein correlation functions. These considerations are tested on NA22 and UA1 two-pion correlation data., 8 pages, 5 figures, presented by T. Csorgo at the XXXIV International Symposium on Multiparticle Dynamics, Sonoma County, California, USA, July 2004, to appear in Acta Physica Polonica B
Published: 2004

102. Indications for the onset of deconfinement in nucleus nucleus collisions

Author: Flierl, D., Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Białkowska, H., Billmeier, A., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J G., Csató, P., Darmenov, N., Dimitrov, A., Dinkelaker, P., Eckardt, V., Fodor, Z., Foka, P., Freund, P., Friese, V., Gál, J., Gazdzicki, M., Georgopoulos, G., Gładysz, E., Grebieszkow, K., Hegyi, S., Höhne, C., Kadija, K., Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V I., Kollegger, T., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Lévai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Markert, C., Mateev, M., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnár, J., Mrówczynski, S., Pálla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Pikna, M., Pinsky, L., Pühlhofer, F., Reid, J.G., Renfordt, R., Richard, A., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Siklér, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Ströbele, H., Susa, T., Szentpétery, I., Sziklai, J., Trainor, T.A., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Włodarczyk, Z., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: Physics, Range (particle radiation), Large Hadron Collider, 010308 nuclear & particles physics, Hadron, Nuclear Theory, FOS: Physical sciences, Nuclear matter, 7. Clean energy, 01 natural sciences, Deconfinement, Nuclear physics, medicine.anatomical_structure, Pion, 0103 physical sciences, medicine, Transverse mass, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Nucleus, Nuclear Physics
Abstract: The hadronic final state of central Pb+Pb collisions at 20, 30, 40, 80, and 158 AGeV has been measured by the CERN NA49 collaboration. The mean transverse mass of pions and kaons at midrapidity stays nearly constant in this energy range, whereas at lower energies, at the AGS, a steep increase with beam energy was measured. Compared to p+p collisions as well as to model calculations, anomalies in the energy dependence of pion and kaon production at lower SPS energies are observed. These findings can be explained, assuming that the energy density reached in central A+A collisions at lower SPS energies is sufficient to transform the hot and dense nuclear matter into a deconfined phase., 6 pages, 8 Figures, proceedings of the ICHEP2004 conference
Published: 2004

103. $\Omega$ and $\bar{\Omega}$ production in central Pb+Pb collisions at 40 and 158 AGeV

Author: Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Darmenov, N., Dimitrov, A., Dinkelaker, P., Eckardt, V., Farantatos, G., Flierl, D., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, K., Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V.I., Kollegger, T., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Markert, C., Mateev, M., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., Palla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J.G., Renfordt, R., Richard, A., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strobele, H., Susa, T., Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment, Nuclear Physics
Abstract: Results are presented on $\Omega$ production in central Pb+Pb collisions at 40 and 158A GeV beam energy. Given are transverse-mass spectra, rapidity distributions, and total yields for the sum $\Omega$+$\bar{\Omega}$ at 40 AGeV and for $\Omega$ and $\bar{\Omega}$ separately at 158 AGeV. The yields are strongly under-predicted by the string-hadronic UrQMD model and agree with predictions from a hadron gas model assuming strangeness under-saturation. Results are presented on Omega production in central Pb+Pb collisions at 40 and 158 AGeV beam energy. Given are transverse-mass spectra, rapidity distributions, and total yields for the sum Omega+Antiomega at 40 AGeV and for Omega and Antiomega separately at 158 AGeV. The yields are strongly under-predicted by the string-hadronic UrQMD model and are in better agreement with predictions from a hadron gas models.
Published: 2004

104. Lambda and Antiambda production in central Pb-Pb collisions at 40, 80, and 158A GeV

Author: Antičić, Tome, Baatar, B., Barna, D., Bartke, J., Behler, M., Betev, L., Bialkowska, H., Billimeier, A., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Darmenov, N., Dimitrov, A., Dinkelaker, P., Eckardt, V., Filip, P., Flierl, D., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Hegyi, S., Hohne, C., Kadija, Krešo, Karev, A., Kolesnikov, V.I., Kollegger, T., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Levai, P., Litov, L., Makariev, M., Malakhov, A.I., Markert, C., Mateev, M., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Palla, G., Panagiotou, A.D., Panayotov, D., Perl, K., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J.G., Renfordt, R., Retyk, W., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranić, Danilo, Wetzler, A., Wlodarczyk, Z., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: Physics, lambda, antilambda, strange particle, production, Pb+Pb collsions, NA49, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Production of Lambda and Antilambda hyperons was measured in central Pb-Pb collisions at 40, 80, and 158 A GeV beam energy on a fixed target. Transverse mass spectra and rapidity distributions are given for all three energies. The Lambda/pi ratio at mid-rapidity and in full phase space shows a pronounced maximum between the highest AGS and 40 A GeV SPS energies, whereas the Antilambda/pi ratio exhibits a monotonic increase.
Published: 2004

105. Rapidity and transverse momentum dependence of pion-pion Bose-Einstein correlations measured at 20, 30, 40, 80, and 158 AGeV beam energy

Author: Kniege, S., Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Darmenov, N., Dimitrov, A., Dinkelaker, P., Eckardt, V., Farantatos, G., Filip, P., Flierl, D., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, K., Karev, A., Kliemant, M., Kolesnikov, V.I., Kollegger, T., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Markert, C., Mateev, M., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., Palla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Pikna, M., Pinsky, Lawrence S., Puhlhofer, F., Reid, J.G., Renfordt, R., Richard, A., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strobele, H., Susa, T., Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: Physics, Nuclear and High Energy Physics, Nuclear Theory, FOS: Physical sciences, Bose–Einstein correlations, Radius, Nuclear physics, Pion, Transverse momentum, Rapidity, Nuclear Experiment (nucl-ex), Nuclear Experiment, Beam energy, NA49 experiment, Energy (signal processing), Nuclear Physics
Abstract: Preliminary results on pion-pion Bose-Einstein correlations in central Pb+Pb collisions measured by the NA49 experiment are presented. Rapidity as well as transverse momentum dependence of the HBT-radii are shown for collisions at 20, 30, 40, 80, and 158 AGeV beam energy. Including results from AGS and RHIC experiments only a weak energy dependence of the radii is observed. Based on hydrodynamical models parameters like lifetime and geometrical radius of the source are derived from the dependence of the radii on transverse momentum., 5 pages, 4 figures, contribution to the Quark Matter conference, Oakland, USA, Jan 11-17, 2004
Published: 2004

106. Report from NA49

Author: Gazdzicki, M, Alt, C, Anticic, T, Baatar, B, Barna, D, Bartke, Jerzy, Betev, L, Bialkowska, H, Billmeier, A, Blume, C, Boimska, B, Botje, M, Bracinik, J, Bramm, R, Brun, R, Buncic, P, Cerny, V, Christakoglou, P, Chvala, O, Cramer, J G, Csató, P, Darmenov, N, Dimitrov, A, Dinkelaker, P, Eckardt, V, Farantatos, G, Filip, P, Flierl, D, Fodor, Z, Foka, P Y, Freund, P, Friese, V, Gál, J, Georgopoulos, G, Gladysz-Dziadus, E, Grebieszkow, K, Hegyi, S, Höhne, C, Kadija, K, Karev, A, Kliemant, M, Kniege9, S, Kolesnikov, V I, Kollegger, T, Kornas, E, Korus, R, Kowalski, M, Kraus, I, Kreps, M, Van Leeuwen, M, Lévai, Peter, Litov, L, Lungwitz, B, Makariev, M, Malakhov, A I, Markert, C, Mateev, M, Mayes, B W, Melkumov, G L, Meurer, C, Mischke, A, Mitrovski, M, Molnár, J, Mrówczynski, S, Pálla, G, Panagiotou, A D, Panayotov, D, Petridis, A, Pikna, M, Pinsky, L, Pühlhofer, F, Reid, J G, Renfordt, R E, Richard, A, Roland, C, Roland, G, Rybczynski, M, Rybicki, A, Sandoval, A, Sann, H, Schmitz, N, Seyboth, P, Siklér, F, Sitár, B, Skrzypczak, E, Stefanek, G, Stock, R, Ströbele, H, Susa, T, Szentpétery, I, Sziklai, J, Trainor, T A, Varga, D, Vassiliou, Maria, Veres, G I, Vesztergombi, G, Vranic, D, Wetzler, A, Wlodarczyk, Z, Yoo, I K, Zaranek, J, and Zimányi, J
Subjects: Physics, Nuclear and High Energy Physics, Large Hadron Collider, Hadron, Nuclear Theory, Deconfinement, Nuclear physics, Pion, Transverse momentum, Nuclear Physics - Experiment, High Energy Physics::Experiment, Multiplicity (chemistry), Nuclear Experiment
Abstract: The most recent data of NA49 on hadron production in nuclear collisions at CERN SPS energies are presented. Anomalies in the energy dependence of pion and kaon production in central Pb+Pb collisions are observed. They suggest that the onset of deconfinement is located at about 30 AGeV. Large multiplicity and transverse momentum fluctuations are measured for collisions of intermediate mass systems at 158 AGeV. The need for a new experimental programme at the CERN SPS is underlined., Comment: invited talk presented at Quark Matter 2004, 10 pages
Published: 2004

107. Evidence for an Exotic S = -2, Q = -2 Baryon Resonance in Proton-Proton Collisions at the CERN SPS

Author: Alt, C., Antičić, Tome, Baatar, B., Barna, D., Bartke, J., Betev, L., Biakowska, H., Billimeier, A., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Darmenov, N., Dimitrov, A., Dinkelaker, P., Eckardt, V., Farantatos, G., Filip, P., Flierl, D., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Hegyi, S., Hohne, C., Kadija, Krešo, Karev, A., Kniege, S., Kolesnikov, V.I., Kollegger, T., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Levai, P., Litov, L., Makariev, M., Malakhov, A.I., Markert, C., Mateev, M., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Palla, G., Panagiotou, A.D., Panayotov, D., Perl, K., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J.G., Renfordt, R., Retyk, W., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wodarczyk, Z., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: Physics, High Energy Physics::Phenomenology, exotic, pentaquark, NA49, p+p, Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Results of resonance searches in the Xi-pi-, Xi-pi+, bar{; ; ; ; Xi}; ; ; ; +pi-, and bar{; ; ; ; Xi}; ; ; ; +pi+ invariant mass spectra in proton-proton collisions at sqrt{; ; ; ; s}; ; ; ; = 17.2 GeV are presented. Evidence is shown for the existence of a narrow Xi-pi- baryon resonance with mass of 1.862± ; ; 0.002 GeV/c2 and width below the detector resolution of about 0.018 GeV/c2. The significance is estimated to be above 4.2. This state is a candidate for the hypothetical exotic Xi^{; ; ; ; --}; ; ; ; _{; ; ; ; ; ; 3/2}; ; ; ; baryon with S = -2, I = 3/2, and a quark content of (dsds\bar{; ; ; ; u}; ; ; ; ). At the same mass, a peak is observed in the \Xi^{; ; ; ; -}; ; ; ; \pi^{; ; ; ; +}; ; ; ; spectrum which is a candidate for the \Xi^{; ; ; ; 0}; ; ; ; _{; ; ; ; 3/2}; ; ; ; member of this isospin quartet with a quark content of (dsus\bar{; ; ; ; d}; ; ; ; ). The corresponding antibaryon spectra also show enhancements at the same invariant mass.
Published: 2004

108. Transverse momentum fluctuations in nuclear collisions at 158A GeV

Author: Anticic, T. Baatar, B. Barna, D. Bartke, J. Behler, M. Betev, L. Bialkowska, H. Billmeier, A. Blume, C. Boimska, B. Botje, M. Bracinik, J. Bramm, R. Brun, R. Bunčić, P. Cerny, V. Christakoglou, P. Chvala, O. Cramer, J.G. Csató, P. Darmenov, N. Dimitrov, A. Dinkelaker, P. Eckardt, V. Filip, P. Flierl, D. Fodor, Z. Foka, P. Freund, P. Friese, V. Gál, J. Gaździcki, M. Georgopoulos, G. Gładysz, E. Grebieszkow, K. Hegyi, S. Höhne, C. Kadija, K. Karev, A. Kolesnikov, V.I. Kollegger, T. Korus, R. Kowalski, M. Kraus, I. Kreps, M. Van Leeuwen, M. Lévai, P. Litov, L. Makariev, M. Malakhov, A.I. Markert, C. Mateev, M. Mayes, B.W. Melkumov, G.L. Meurer, C. Mischke, A. Mitrovski, M. Molnár, J. Mrówczyński, St. Pálla, G. Panagiotou, A.D. Panayotov, D. Petridis, A. Pikna, M. Pinsky, L. Pühlhofer, F. Reid, J.G. Renfordt, R. Retyk, W. Roland, C. Roland, G. Rybczyński, M. Rybicki, A. Sandoval, A. Sann, H. Schmitz, N. Seyboth, P. Siklér, F. Sitar, B. Skrzypczak, E. Stefanek, G. Stock, R. Ströbele, H. Susa, T. Szentpétery, I. Sziklai, J. Trainor, T.A. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vranić, D. Wetzler, A. Włodarczyk, Z. Yoo, I.K. Zaranek, J. Zimányi, J.
Subjects: Nuclear Experiment
Abstract: Results are presented on event-by-event fluctuations in transverse momentum of charged particles, produced at forward rapidities in p+p, C+C, Si+Si, and Pb+Pb collisions at 158 AGeV. Three different characteristics are discussed: the average transverse momentum of the event, the ΦpT fluctuation measure, and two-particle transverse momentum correlations. In the kinematic region explored, the dynamical fluctuations are found to be small. However, a significant system size dependence of ΦpT is observed, with the largest value measured in peripheral Pb+Pb interactions. The data are compared with predictions of several models.
Published: 2004

109. Energy and centrality dependence of deuteron and proton production in [Formula Presented] collisions at relativistic energies

Author: Anticic, T. Baatar, B. Barna, D. Bartke, J. Behler, M. Betev, L. Białkowska, H. Billimeier, A. Blume, C. Boimska, B. Botje, M. Bracinik, J. Bramm, R. Brun, R. Bunčić, P. Cerny, V. Christakoglou, P. Chvala, O. Cooper, G.E. Cramer, J.G. Csató, P. Dinkelaker, P. Eckardt, V. Filip, P. Fischer, H.G. Fodor, Z. Foka, P. Freund, P. Friese, V. Gál, J. Gaździcki, M. Georgopoulos, G. Gładysz, E. Hegyi, S. Höhne, C. Jacobs, P. Kadija, K. Karev, A. Kolesnikov, V.I. Kollegger, T. Korus, R. Kowalski, M. Kraus, I. Kreps, M. van Leeuwen, M. Lévai, P. Malakhov, A.I. Markert, C. Mayes, B.W. Melkumov, G.L. Meurer, C. Mischke, A. Mitrovski, M. Molnár, J. Mrówczyński, S. Pálla, G. Panagiotou, A.D. Perl, K. Petridis, A. Pikna, M. Pinsky, L. Pühlhofer, F. Reid, J.G. Renfordt, R. Retyk, W. Roland, C. Roland, G. Rybczyński, M. Rybicki, A. Sandoval, A. Sann, H. Schmitz, N. Seyboth, P. Siklér, F. Sitar, B. Skrzypczak, E. Stefanek, G. Stock, R. Ströbele, H. Susa, T. Szentpétery, I. Sziklai, J. Trainor, T.A. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vranić, D. Wenig, S. Wetzler, A. Włodarczyk, Z. Xu, N. Yoo, I.K. Zaranek, J. Zimányi, J.
Subjects: Nuclear Experiment
Abstract: The transverse mass [Formula Presented] distributions for deuterons and protons are measured in [Formula Presented] reactions near midrapidity and in the range [Formula Presented] for minimum bias collisions at [Formula Presented] and for central collisions at 40 and [Formula Presented] beam energies. The rapidity density [Formula Presented], inverse slope parameter [Formula Presented] and mean transverse mass [Formula Presented] derived from [Formula Presented] distributions as well as the coalescence parameter [Formula Presented] are studied as a function of the incident energy and the collision centrality. The deuteron [Formula Presented] spectra are significantly harder than those of protons, especially in central collisions. The coalescence factor [Formula Presented] shows three systematic trends. First, it decreases strongly with increasing centrality reflecting an enlargement of the deuteron coalescence volume in central [Formula Presented] collisions. Second, it increases with [Formula Presented]. Finally, [Formula Presented] shows an increase with decreasing incident beam energy even within the SPS energy range. The results are discussed and compared to the predictions of models that include the collective expansion of the source created in [Formula Presented] collisions. © 2004 The American Physical Society.
Published: 2004

110. Electric charge fluctuations in central Pb+Pb collisions at 20, 30, 40, 80 and 158 AGeV

Author: Alt, C., Antičić, Tome, Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Darmenov, N., Dimitrov, A., Dinkelaker, P., Eckardt, V., Farantatos, D., Flierl, D., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, Krešo, Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V.I., Kollegger, T., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Markert, C., Mateev, M., Mayes, B.W., Melkumov, G. L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, S., Palla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J.G., Renfordt, R., Richard, A., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Yoo, I. K., Zaranek, J., and Zimanyi, J.
Subjects: event-by-event, electric charge, fluctuations, Pb+Pb collisions, NA49, Physics, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment, Nuclear Physics
Abstract: Results are presented on event-by-event electric charge fluctuations in central Pb+Pb collisions at 20, 30, 40, 80 and 158 AGeV. The observed fluctuations are close to those expected for a gas of pions correlated by global charge conservation only. These fluctuations are considerably larger than those calculated for an ideal gas of deconfined quarks and gluons. The present measurements do not necessarily exclude reduced fluctuations from a quark-gluon plasma because these might be masked by contributions from resonance decays.
Published: 2004

111. Electric charge fluctuations in central Pb+Pb collisions at 20A, 30A, 40A, 80A, and 158A GeV

Author: Alt, C, Anticic, T, Baatar, B, Barna, D, Bartke, Jerzy, Behler, M, Betev, L, Bialkowska, H, Billmeier, A, Blume, C, Boimska, B, Botje, M, Bracinik, J, Bramm, R, Brun, R, Buncic, P, Cerny, V, Christakoglou, P, Chvala, O, Cramer, J G, Csató, P, Darmenov, N, Dimitrov, A, Dinkelaker, P, Eckardt, V, Filip, P, Flierl, D, Fodor, Z, Foka, P, Freund, P, Friese, V, Gál, J, Gazdzicki, M, Georgopoulos, G, Gladysz-Dziadus, E, Grebieszkow, K, Hegyi, S, Höhne, C, Kadija, K, Karev, A, Kliemant, M, Kniege, S, Kolesnikov, V I, Kollegger, T, Kornas, E, Korus, R, Kowalski, M, Kraus, I, Kreps, M, Lévai, Peter, Litov, L, Lungwitz, B, Makariev, M, Malakhov, A I, Markert, C, Mateev, M, Mayes, B W, Melkumov, G L, Meurer, C, Mischke, A, Mitrovski, M, Molnár, J, Mrówczynski, S, Pálla, G, Panagiotou, A D, Panayotov, D, Petridis, A, Pikna, M, Pinsky, L, Pühlhofer, F, Reid, J G, Renfordt, R, Richard, A, Roland, C, Roland, G, Rybczynski, M, Rybicki, A, Sandoval, A, Sann, H, Schmitz, N, Seyboth, P, Siklér, F, Sitár, B, Skrzypczak, E, Stefanek, G, Stock, R, Ströbele, H, Susa, T, Szentpétery, I, Sziklai, J, Trainor, T A, Varga, D, Vassiliou, Maria, Veres, G I, Vesztergombi, G, Vranic, D, Wetzler, A, Wlodarczyk, Z, Yoo, I K, Zaranek, J, Zimányi, J, and Van Leeuwen, M
Subjects: High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment, Nuclear Physics
Abstract: Results are presented on event-by-event electric charge fluctuations in central Pb+Pb collisions at 20A, 30A, 40A, 80A, and 158A GeV. The observed fluctuations are close to those expected for a gas of pions correlated by global charge conservation only. These fluctuations are considerably larger than those calculated for an ideal gas of deconfined quarks and gluons. The present measurements do not necessarily exclude reduced fluctuations from a quark-gluon plasma because these might be masked by contributions from resonance decays.
Published: 2004

112. Electric charge fluctuations in central Pb+Pb collisions at 20A, 30A, 404, 80A, and 158A GeV

Author: Alt, C. Anticic, T. Baatar, B. Barna, D. Bartke, J. Behler, M. Betev, L. Bialkowska, H. Billmeier, A. Blume, C. Boimska, B. Botje, M. Bracinik, J. Bramm, R. Brun, R. Bunčić, P. Cerny, V. Christakoglou, P. Chvala, O. Cramer, J.G. Csató, P. Darmenov, N. Dimitrov, A. Dinkelaker, P. Eckardt, V. Filip, P. Flierl, D. Fodor, Z. Foka, P. Freund, P. Friese, V. Gál, J. Gaździcki, M. Georgopoulos, G. Gladysz, E. Grebieszkow, K. Hegyi, S. Höhne, C. Kadija, K. Karev, A. Kliemant, M. Kniege, S. Kolesnikov, V.I. Kollegger, T. Kornas, E. Korus, R. Kowalski, M. Kraus, I. Kreps, M. van Leeuwen, M. Lévai, P. Litov, L. Lungwitz, B. Makariev, M. Malakhov, A.I. Markert, C. Mateev, M. Mayes, B.W. Melkumov, G.L. Meurer, C. Mischke, A. Mitrovski, M. Molnár, J. Mrówczyński, S. Pálla, G. Panagiotou, A.D. Panayotov, D. Petridis, A. Pikna, M. Pinsky, L. Pühlhofer, F. Reid, J.G. Renfordt, R. Richard, A. Roland, C. Roland, G. Rybczyński, M. Rybicki, A. Sandoval, A. Sann, H. Schmitz, N. Seyboth, P. Siklér, F. Sitar, B. Skrzypczak, E. Stefanek, G. Stock, R. Ströbele, H. Susa, T. Szentpétery, I. Sziklai, J. Trainor, T.A. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vranic, D. Wetzler, A. Wlodarczyk, Z. Yoo, I.K. Zaranek, J. Zimányi, J.
Subjects: High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Results are presented on event-by-event electric charge fluctuations in central Pb+Pb collisions at 20A, 30A, 40A, 80A, and 158A GeV. The observed fluctuations are close to those expected for a gas of pions correlated by global charge conservation only. These fluctuations are considerably larger than those calculated for an ideal gas of deconfined quarks and gluons. The present measurements do not necessarily exclude reduced fluctuations from a quark-gluon plasma because these might be masked by contributions from resonance decays.
Published: 2004

113. Energy dependence of hadronic observables in central Pb+Pb reactions at the CERN SPS

Author: Blume, C, Anticic, T, Baatar, B, Barna, D, Bartke, J, Betev, L, Bialkowska, H, Billmeier, A, Boimska, B, Botje, M, Bracinik, J, Bramm, R, Brun, R, Buncic, P, Cerny, V, Christakoglou, P, Chvala, O, Cramer, J G, Csató, P, Darmenov, N, Dimitrov, A, Dinkelaker, P, Eckardt, V, Farantatos, G, Flierl, D, Fodor, Z, Foka, P, Freund, P, Friese, V, Gál, J, Gazdzicki, M, Georgopoulos, G, Gladysz-Dziadus, E, Grebieszkow, K, Hegyi, S, Höhne, C, Kadija, K, Karev, A, Kliemant, M, Kniege, S, Kolesnikov, V I, Kollegger, T, Kornas, E, Korus, R, Kowalski, M, Kraus, I, Kreps, M, Van Leeuwen, M, Lévai, Peter, Litov, L, Lungwitz, B, Makariev, M, Malakhov, A I, Markert, C, Mateev, M, Mayes, B W, Melkumov, G L, Meurer, C, Mischke, A, Mitrovski, M, Molnár, J, Mrówczynski, S, Pálla, G, Panagiotou, A D, Panayotov, D, Petridis, A, Pikna, M, Pinsky, L, Pühlhofer, F, Reid, J G, Renfordt, R, Richard, A, Roland, C, Roland, G, Rybczynski, M, Rybicki, A, Sandoval, A, Sann, H, Schmitz, N, Seyboth, P, Siklér, F, Sitár, B, Skrzypczak, E, Stefanek, C, Stock, R, Ströbele, H, Susa, T, Szentpétery, I, Sziklai, J, Trainor, T A, Trubnikov, V, Varga, D, Vassiliou, M, Veres, G I, Vesztergombi, G, Vranic, D, Wetzler, A, Wlodarczyk, Z, Yoo, I K, Zaranek, J, and Zimányi, J
Subjects: Physics, Nuclear and High Energy Physics, Phase transition, Large Hadron Collider, Hadron, Nuclear Theory, General Physics and Astronomy, FOS: Physical sciences, Observable, Nuclear physics, Phase (matter), High Energy Physics::Experiment, Nuclear Physics - Experiment, Rapidity, Nuclear Experiment (nucl-ex), Nuclear Experiment, NA49 experiment, Beam (structure), Nuclear Physics
Abstract: In the recent years the NA49 experiment has collected data on Pb+Pb collisions at beam energies between 20 to 158 AGeV with the objective to cover the critical region of energy densities where the expected phase transition to a deconfined phase might occur in the early stage of the reactions. In this contribution the energy dependence of various hadronic observables is presented. These include m_t- and rapidity- distributions, particle ratio fluctuations, as well as HBT radii., Comment: 7 pages, 5 figures, Proceedings of the 20th Winter Workshop on Nuclear Dynamics, Jamaica
Published: 2004
Full Text: View/download PDF

114. Energy and centrality dependence of deuteron and proton production in Pb + Pb collisions at relativistic energies

Author: Antičić, Tome, Baatar, B., Barna, D., Bartke, J., Behler, M., Betev, L., Bialkowska, H., Billimeier, A., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cooper, G. E., Cramer, J. G., Csato, P., Dinkelaker, P., Eckardt, V., Filip, P., Fischer, H. G., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Hegyi, S., Hohne, C., Jacobs, P., Kadija, Krešo, Karev, A., Kolesnikov, V. I., Kollegger, T., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Levai, P., Malakhov, A. I., Markert, C., Mayes, B. W., Melkumov, G. L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Palla, G., Panagiotou, A. D., Perl, K., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J. G., Renfordt, R., Retyk, W., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trainor, T. A., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Vranic, D., Wenig, S., Wetzler, A., Wlodarczyk, Z., Xu, N., Yoo, I. K., Zaranek, J., and Zimanyi, J.
Subjects: Physics, deuteron, proton, production, NA49, Pb + Pb collisions, Nuclear Experiment
Abstract: The transverse mass mt distributions for deuterons and protons are measured in Pb + Pb reactions near midrapidity and in the range 0
Published: 2004

115. Energy and centrality dependence of deuteron and proton production in Pb+Pb collisions at relativistic energies

Author: Anticic, T, Kraus, I, Kreps, M, Van Leeuwen, M, Lévai, Peter, Malakhov, A I, Markert, C, Mayes, B W, Gazdzicki, M, Höhne, C, Jacobs, P, Kadija, K, Karev, A, Kolesnkikov, V I, Kolleger, T, Korus, R, Kowalski, M, Georgopoulos, G, Gladysz-Dziadus, E, Hegyi, S, Friese, F, Gál, J, Baatar, B, Bartke, Jerzy, Behler, M, Betev, L, Bialkowska, H, Billmeier, A, Blume, C, Boimska, B, Botje, M, Bracinik, J, Bramm, R, Brun, R, Bruncic, P, Chvala, O, Cooper, G E, Cramer, J G, Csató, P, Dinkelaker, P, Eckhardt, V, Cerny, V, Filip, P, Fodor, Z, Foka, P, Freund, P, Fischer, H G, and Christakoglou, P
Subjects: XX
Published: 2004

116. System-size dependence of strangeness production in nucleus-nucleus collisions at $\sqrt{s_{NN}}=17.3$ GeV

Author: Alt, C, Anticic, T, Baatar, B, Barna, D, Bartke, Jerzy, Betev, L, Bialkowska, H, Billmeier, A, Blume, C, Boimska, B, Botje, M, Bracinik, J, Bramm, R, Brun, R, Buncic, P, Cerny, V, Christakoglou, P, Chvala, O, Cramer, J G, Csató, P, Darmenov, N, Dimitrov, A, Dinkelaker, P, Eckardt, V, Farantatos, G, Flierl, D, Fodor, Z, Foka, P Y, Freund, P, Friese, V, Gál, J, Gazdzicki, M, Georgopoulos, G, Gladysz-Dziadus, E, Grebieszkow, K, Hegyi, S, Höhne, C, Kadija, K, Karev, A, Kliemant, M, Kniege, S, Kolesnikov, V I, Kollegger, T, Kornas, E, Korus, R, Kowalski, M, Kraus, I, Kreps, M, Van Leeuwen, M, Lévai, Peter, Litov, L, Lungwitz, B, Makariev, M, Malakhov, A I, Markert, C, Mateev, M, Mayes, B W, Melkumov, G L, Meurer, C, Mischke, A, Mitrovski, M, Molnár, J, Mrówczynski, S, Pálla, G, Panagiotou, A D, Panayotov, D, Petridis, A, Pikna, M, Pinsky, L, Pühlhofer, F, Reid, J G, Renfordt, R E, Richard, A, Roland, C, Roland, G, Rybczynski, M, Rybicki, A, Sandoval, A, Sann, H, Schmitz, N, Seyboth, P, Siklér, F, Sitár, B, Skrzypczak, E, Stefanek, G, Stock, R, Ströbele, H, Susa, T, Szentpétery, I, Sziklai, J, Trainor, T A, Trubnikov, V, Varga, D, Vassiliou, Maria, Veres, G I, Vesztergombi, G, Vranic, D, Wetzler, A, Wlodarczyk, Z, Yoo, I K, Zaranek, J, and Zimányi, J
Subjects: Nuclear Theory, Nuclear Experiment, Nuclear Physics
Abstract: Emission of $\pi{\pm}$, $K{\pm}$, $\phi$ and $\Lambda$ was measured in near-central C+C and Si+Si collisions at 158 AGeV beam energy. Together with earlier data for p+p, S+S and Pb+Pb, the system-size dependence of relative strangeness production in nucleus-nucleus collisions is obtained. Its fast rise and the saturation observed at about 60 participating nucleons can be understood as onset of the formation of coherent partonic subsystems of increasing size.
Published: 2004

117. Strangeness from 20AGeV to 158AGeV

Author: Alt, C., Antičić, Tome, Baatar, B., Barna, D, Bartke, J., Behler, M., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Bunčcić, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Filip, P., Fischer, H.G., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Hegyi, S., Hohne, C., Kadija, Krešo, Karev, A., Kniege, S., Kolesnikov, V.I., Kollegger, T., Korus, R., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Levai, P., Malakhov, A.I., Markert, C., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., Palla, G., Panagiotou, A.D., Perl, K., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J.G., Renfordt, R., Retyk, W., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranić, Danilo, Wenig, S., Wetzler, A., Wodarczyk, Z., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: SPS energy, strange particle production, Nuclear Theory, Nuclear Experiment
Abstract: New results from the energy scan programme of NA49, in particular kaon production at 30AGeV and fi production at 40 and 80AGeV are presented. The K+/pi+ ratio shows a pronounced maximum at 30AGeV ; the kaon slope parameters are constant at SPS energies. Both findings support the scenario of a phase transition at about 30AGeV beam energy. The fi/pi ratio increases smoothly with beam energy, showing an energy dependence similar toK-/pi-. The measured particle yields can be reproduced by a hadron gas model, with chemical freeze-out parameters on a smooth curve in the T– &micro ; ; ; ; _B plane. The transverse spectra can be understood as resulting from a rapidly expanding, locally equilibrated source. No evidence for an earlier kinetic decoupling of heavy hyperons is found.
Published: 2004

118. Λ and Λ̄ production in central Pb-Pb collisions at 40, 80, and 158A GeV

Author: Anticic, T. Baatar, B. Barna, D. Bartke, I. Behler, M. Betev, L. Białkowska, H. Billmeier, A. Blume, C. Boimska, B. Botje, M. Bracinik, J. Bramm, R. Brun, R. Bunčić, P. Cerny, V. Christakoglou, P. Chvala, O. Cramer, J.G. Csató, P. Darmenov, N. Dimitrov, A. Dinkelaker, P. Eckardt, V. Filip, P. Flierl, D. Fodor, Z. Foka, P. Freund, P. Friese, V. Gál, J. Gaździcki, M. Georgopoulos, G. Gładysz, E. Hegyi, S. Höhne, C. Kadija, K. Karev, A. Kolesnikov, V.I. Kollegger, T. Kornas, E. Korus, R. Kowalski, M. Kraus, I. Kreps, M. Van Leeuwen, M. Lévai, P. Litov, L. Makariev, M. Malakhov, A.I. Markert, C. Mateev, M. Mayes, B.W. Melkumov, G.L. Meurer, C. Mischke, A. Mitrovski, M. Molnár, J. Mrówczyński, St. Pálla, G. Panagiotou, A.D. Panayotov, D. Perl, K. Petridis, A. Pikna, M. Pinsky, L. Pühlhofer, F. Reid, J.G. Renfordt, R. Retyk, W. Roland, C. Roland, G. Rybczyński, M. Rybicki, A. Sandoval, A. Sann, H. Schmitz, N. Seyboth, P. Siklér, F. Sitar, B. Skrzypczak, E. Stefanek, G. Stock, R. Ströbele, H. Susa, T. Szentpétery, I. Sziklai, J. Trainer, T.A. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vranić, D. Wetzler, A. Włodarczyk, Z. Yoo, I.K. Zaranek, J. Zimányi, J.
Subjects: Nuclear Experiment
Abstract: The measurement of production of Lambda and Antilambda hyperons was taken in central Pb-Pb collisions at 40, 80, and 158A GeV beam energy on a fixed target. For all the three beam energies the transverse mass spectra and rapidity distributions are studied. By integrating the rapidity spectra with extrapolations into unmeasured regions, total multiplicities were obtained. The ratio of the three energies at midrapidity and in full phase space was also studied.
Published: 2004

119. Evidence for an Exotic [Formula presented], [Formula presented] Baryon Resonance in Proton-Proton Collisions at the CERN SPS

Author: Alt, C. Anticic, T. Baatar, B. Barna, D. Bartke, J. Betev, L. Białkowska, H. Billmeier, A. Blume, C. Boimska, B. Botje, M. Bracinik, J. Bramm, R. Brun, R. Bunčić, P. Cerny, V. Christakoglou, P. Chvala, O. Cramer, J.G. Csató, P. Darmenov, N. Dimitrov, A. Dinkelaker, P. Eckardt, V. Farantatos, G. Filip, P. Flierl, D. Fodor, Z. Foka, P. Freund, P. Friese, V. Gál, J. Gaździcki, M. Georgopoulos, G. Gładysz, E. Hegyi, S. Höhne, C. Kadija, K. Karev, A. Kniege, S. Kolesnikov, V.I. Kollegger, T. Korus, R. Kowalski, M. Kraus, I. Kreps, M. van Leeuwen, M. Lévai, P. Litov, L. Makariev, M. Malakhov, A.I. Markert, C. Mateev, M. Mayes, B.W. Melkumov, G.L. Meurer, C. Mischke, A. Mitrovski, M. Molnár, J. Mrówczyński, S. Pálla, G. Panagiotou, A.D. Panayotov, D. Perl, K. Petridis, A. Pikna, M. Pinsky, L. Pühlhofer, F. Reid, J.G. Renfordt, R. Retyk, W. Roland, C. Roland, G. Rybczyński, M. Rybicki, A. Sandoval, A. Sann, H. Schmitz, N. Seyboth, P. Siklér, F. Sitar, B. Skrzypczak, E. Stefanek, G. Stock, R. Ströbele, H. Susa, T. Szentpétery, I. Sziklai, J. Trainor, T.A. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vranić, D. Wetzler, A. Włodarczyk, Z. Yoo, I.K. Zaranek, J. Zimányi, J.
Subjects: Nuclear Theory, Nuclear Experiment
Abstract: Results of resonance searches in the [Formula presented], [Formula presented], [Formula presented], and [Formula presented] invariant mass spectra in proton-proton collisions at [Formula presented] are presented. Evidence is shown for the existence of a narrow [Formula presented] baryon resonance with mass of [Formula presented] and width below the detector resolution of about [Formula presented]. The significance is estimated to be above [Formula presented]. This state is a candidate for the hypothetical exotic [Formula presented] baryon with [Formula presented], [Formula presented], and a quark content of ([Formula presented]). At the same mass, a peak is observed in the [Formula presented] spectrum which is a candidate for the [Formula presented] member of this isospin quartet with a quark content of ([Formula presented]). The corresponding antibaryon spectra also show enhancements at the same invariant mass. © 2004 The American Physical Society.
Published: 2004

120. Evidence for an exotic S=-2, Q=-2 baryon resonance in proton-proton collisions at the CERN SPS

Author: Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Darmenov, N., Dimitrov, A., Dinkelaker, P., Eckardt, V., Farantatos, G., Filip, P., Flierl, D., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Hegyi, S., Hohne, C., Kadija, K., Karev, A., Kniege, S., Kolesnikov, V.I., Kollegger, T., Korus, R., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Levai, P., Litov, L., Makariev, M., Malakhov, A.I., Markert, C., Mateev, M., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., Palla, G., Panagiotou, A.D., Panayotov, D., Perl, K., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J.G., Renfordt, R., Retyk, W., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strobele, H., Susa, T., Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract: Results of resonance searches in the $\Xi^{-} \pi^{-}, \Xi^{-} \pi ^{+}, \bar{\Xi}^{+} \pi^{-}$, and $\bar{\Xi}^{+} \pi^{+}$ invariant mass spectra in proton-proton collisions at $\sqrt s =17.2$ GeV are presented. Evidence is shown for the existence of a narrow $\Xi^{-} \pi^{-}$ baryon resonance with mass of 1.862$\pm$0.002 GeV/$c^{2}$ and width below the detector resolution of about 0.018 GeV/$c^{2}$. The significance is estimated to be above 4.2 $\sigma$. This state is a candidate for the hypothetical exotic $\Xi$$^{-}$$^{-}$$\_3$$\_/$$\_2$ baryon with S=-2, I=3/2, and a quark content of $(dsds\bar{u})$. At the same mass, a peak is observed in the $\Xi^{-} \pi ^{+}$ spectrum which is a candidate for the $\Xi$$^{0}$$\_3$$\_/$$\_2$ member of this isospin quartet with a quark content of $(dsus\bar{d})$. The corresponding antibaryon spectra also show enhancements at the same invariant mass. (21 refs). Results of resonance searches in the Xi- pi-, Xi- pi+, antiXi+ pi- and antiXi+ pi+ invariant mass spectra in proton-proton collisions at sqrt{s}=17.2 GeV are presented. Evidence is shown for the existence of a narrow Xi- pi- baryon resonance with mass of 1.862+/-0.002 GeV/c^2 and width below the detector resolution of about 0.018 GeV/c^2. The significance is estimated to be 4.0 sigma. This state is a candidate for the hypothetical exotic Xi_(3/2)^-- baryon with S = -2, I = 3/2 and a quark content of (d s d s ubar). At the same mass a peak is observed in the Xi- pi+ spectrum which is a candidate for the Xi_(3/2)^0 member of this isospin quartet with a quark content of (d s u s dbar). The corresponding antibaryon spectra also show enhancements at the same invariant mass.
Published: 2004

121. Strangeness from 20 A GeV to 158 A GeV

Author: Friese, V. Alt, C. Anticic, T. Baatar, B. Barna, D. Bartke, J. Behler, M. Betev, L. Białkowska, H. Billmeier, A. Blume, C. Boimska, B. Botje, M. Bracinik, J. Bramm, R. Brun, R. Bunčić, P. Cerny, V. Christakoglou, P. Chvala, O. Cramer, J.G. Csató, P. Dinkelaker, P. Eckardt, V. Filip, P. Fischer, H.G. Fodor, Z. Foka, P. Freund, P. Friese, V. Gál, J. Gaździcki, M. Georgopoulos, G. Gładysz, E. Hegyi, S. Höhne, C. Kadija, K. Karev, A. Kniege, S. Kolesnikov, V.I. Kollegger, T. Korus, R. Kowalski, M. Kraus, I. Kreps, M. Van Leeuwen, M. Lévai, P. Malakhov, A.I. Markert, C. Mayes, B.W. Melkumov, G.L. Meurer, C. Mischke, A. Mitrovski, M. Molnár, J. Mrówczyński, St. Pálla, G. Panagiotou, A.D. Perl, K. Petridis, A. Pikna, M. Pinsky, L. Pühlhofer, F. Reid, J.G. Renfordt, R. Retyk, W. Roland, C. Roland, G. Rybczyński, M. Rybicki, A. Sandoval, A. Sann, H. Schmitz, N. Seyboth, P. Siklér, F. Sitar, B. Skrzypczak, E. Stefanek, G. Stock, R. Ströbele, H. Susa, T. Szentpétery, I. Sziklai, J. Trainor, T.A. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vranić, D. Wenig, S. Wetzler, A. Włodarczyk, Z. Yoo, I.K. Zaranek, J. Zimányi, J.
Subjects: Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract: New results from the energy scan programme of NA49, in particular kaon production at 30 A GeV and φ production at 40 and 80 A GeV are presented. The K+/π+ ratio shows a pronounced maximum at 30 A GeV; the kaon slope parameters are constant at SPS energies. Both findings support the scenario of a phase transition at about 30 A GeV beam energy. The φ/π ratio increases smoothly with beam energy, showing an energy dependence similar to K-/π- . The measured particle yields can be reproduced by a hadron gas model, with chemical freeze-out parameters on a smooth curve in the T-μB plane. The transverse spectra can be understood as resulting from a rapidly expanding, locally equilibrated source. No evidence for an earlier kinetic decoupling of heavy hyperons is found.
Published: 2004

122. $\Lambda$ and $\bar{\Lambda}$ production in central Pb-Pb collisions at 40, 80, and 158A GeV

Author: Anticic, T, Baatar, B, Barna, D, Bartke, Jerzy, Behler, M, Betev, L, Bialkowska, H, Billmeier, A, Blume, C, Boimska, B, Botje, M, Bracinik, J, Bramm, R, Brun, R, Buncic, P, Cerny, V, Christakoglou, P, Chvala, O, Cramer, J G, Csató, P, Darmenov, N, Dimitrov, A, Dinkelaker, P, Eckardt, V, Filip, P, Flierl, D, Fodor, Z, Foka, P, Freund, P, Friese, V, Gál, J, Gazdzicki, M, Georgopoulos, G, Gladysz-Dziadus, E, Hegyi, S, Höhne, C, Kadija, K, Karev, A, Kolesnikov, V I, Kollegger, T, Kornas, E, Korus, R, Kowalski, M, Kraus, I, Kreps, M, Van Leeuwen, M, Lévai, Peter, Litov, L, Makariev, M, Malakhov, A I, Markert, C, Mateev, M, Mayes, B W, Melkumov, G L, Meurer, C, Mischke, A, Mitrovski, M, Molnár, J, Mrówczynski, S, Pálla, G, Panagiotou, A D, Panayotov, D, Perl, K, Petridis, A, Pikna, M, Pinsky, L, Pühlhofer, F, Reid, J G, Renfordt, R E, Retyk, W, Roland, C, Roland, G, Rybczynski, M, Rybicki, A, Sandoval, A, Sann, H, Schmitz, N, Seyboth, P, Siklér, F, Sitár, B, Skrzypczak, E, Stefanek, G, Stock, R, Ströbele, H, Susa, T, Szentpétery, I, Sziklai, J, Trainor, T A, Varga, D, Vassiliou, Maria, Veres, G I, Vesztergombi, G, Vranic, D, Wetzler, A, Wlodarczyk, Z, Yoo, I K, Zaranek, J, and Zimányi, J
Subjects: Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Nuclear Physics
Abstract: Production of $\Lambda$ and $\bar{\Lambda}$ hyperons was measured in central Pb-Pb collisions at 40, 80, and 158A GeV beam energy on a fixed target. Transverse mass spectra and rapidity distributions are given for all three energies. The $\Lambda / \pi$ ratio at midrapidity and in full phase space shows a pronounced maximum between the highest BNL Alternating Gradient Synchrotron and 40A GeV CERN Super Proton Synchrotron energies, whereas the $\Lambda / \pi$ ratio exhibits a monotonic increase. (36 refs).
Published: 2004

123. Event-by-Event Fluctuations of Particle Ratios in Central Pb+Pb Collisions at 20 to 158 AGeV

Author: Roland, C, Alt, C, Anticic, T, Baatar, B, Barna, D, Bartke, Jerzy, Betev, L, Bialkowska, H, Billmeier, A, Blume, C, Boimska, B, Botje, M, Bracinik, J, Bramm, R, Brun, R, Buncic, P, Cerny, V, Christakoglou, P, Chvala, O, Cramer, J G, Csató, P, Darmenov, N, Dimitrov, A, Dinkelaker, P, Eckardt, V, Farantatos, G, Flierl, D, Fodor, Z, Foka, P Y, Freund, P, Friese, V, Gál, J, Gazdzicki, M, Georgopoulos, G, Gladysz-Dziadus, E, Grebieszkow, K, Hegyi, S, Höhne, C, Kadija, K, Karev, A, Kliemant, M, Kniege, S, Kolesnikov, V I, Kollegger, T, Kornas, E, Korus, R, Kowalski, M, Kraus, I, Kreps, M, Van Leeuwen, M, Lévai, Peter, Litov, L, Lungwitz, B, Makariev, M, Malakhov, A I, Markert, C, Mateev, M, Mayes, B W, Melkumov, G L, Meurer, C, Mischke, A, Mitrovski, M, Molnár, J, Mrówczynski, S, Pálla, G, Panagiotou, A D, Panayotov, D, Petridis, A, Pikna, M, Pinsky, L, Pühlhofer, F, Reid, J G, Renfordt, R E, Roland, G, Richard, A, Rybczynski, M, Rybicki, A, Sandoval, A, Sann, H, Schmitz, N, Seyboth, P, Siklér, F, Sitár, B, Skrzypczak, E, Stefanek, G, Stock, R, Ströbele, H, Susa, T, Szentpétery, I, Sziklai, J, Trainor, T A, Varga, D, Vassiliou, Maria, Veres, G I, Vesztergombi, G, Vranic, D, Wetzler, A, Wlodarczyk, Z, Yoo, I K, Zaranek, J, and Zimányi, J
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Phase transition, Proton, Nuclear Theory, FOS: Physical sciences, Nuclear physics, Pion, Particle, Nuclear Experiment (nucl-ex), Nuclear Experiment, Event (particle physics), Beam (structure), Nuclear Physics
Abstract: In the vicinity of the QCD phase transition, critical fluctuations have been predicted to lead to non-statistical fluctuations of particle ratios, depending on the nature of the phase transition. Recent results of the NA49 energy scan program show a sharp maximum of the ratio of K+ to Pi+ yields in central Pb+Pb collisions at beam energies of 20-30 AGeV. This observation has been interpreted as an indication of a phase transition at low SPS energies. We present first results on event-by-event fluctuations of the kaon to pion and proton to pion ratios at beam energies close to this maximum., Comment: 4 pages, 4 figures, Quark Matter 2004 proceedings
Published: 2004

124. Multistrange Hyperon Production in Pb+Pb collisions at 30, 40, 80 and 158 A$\cdot$GeV

Author: Mitrovski, Michael, Alt, C, Anticic, T, Baatar, B, Barna, D, Bartke, Jerzy, Behler, M, Betev, L, Bialkowska, H, Billmeier, A, Blume, C, Boimska, B, Botje, M, Bracinik, J, Bramm, R, Brun, R, Buncic, P, Cerny, V, Christakoglou, P, Chvala, O, Cramer, J G, Csató, P, Darmenov, N, Dimitrov, A, Dinkelaker, P, Eckardt, V, Filip, P, Fischer, H G, Flierl, D, Fodor, Z, Foka, P, Freund, P, Friese, V, Gál, J, Gazdzicki, M, Georgopoulos, G, Gladysz-Dziadus, E, Hegyi, S, Höhne, C, Kadija, K, Karev, A, Kliemant, M, Kniege, S, Kolesnikov, V I, Kollegger, T, Kornas, E, Korus, R, Kowalski, M, Kraus, I, Kreps, M, Van Leeuwen, M, Lévai, Peter, Litov, L, Lungwitz, B, Makariev, M, Malakhov, A I, Markert, C, Mateev, M, Mayes, B W, Melkumov, G L, Meurer, C, Mischke, A, Molnár, J, Mrówczynski, S, Pálla, G, Panagiotou, A D, Panayotov, D, Perl, K, Petridis, A, Pikna, M, Pinsky, L, Pühlhofer, F, Reid, J G, Renfordt, R E, Retyk, W, Richard, A, Roland, C, Roland, G, Rybczynski, M, Rybicki, A, Sandoval, A, Sann, H, Schmitz, N, Seyboth, P, Siklér, F, Sitár, B, Skrzypczak, E, Stefanek, G, Stock, R, Ströbele, H, Susa, T, Szentpétery, I, Sziklai, J, Trainor, T A, Varga, D, Vassiliou, Maria, Veres, G I, Vesztergombi, G, Vranic, D, Wenig, S, Wetzler, A, Wlodarczyk, Z, Yoo, I K, Zaranek, J, and Zimányi, J
Subjects: Physics, Nuclear and High Energy Physics, Phase transition, Nuclear Theory, Hyperon, FOS: Physical sciences, Strangeness, Omega, Spectral line, Hadronization, Nuclear physics, Transverse momentum, High Energy Physics::Experiment, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, Beam energy
Abstract: A non-monotonic energy dependence of the $K^{+} / \pi^{+}$ ratio with a sharp maximum close to 30 A$\cdot$GeV is observed in central Pb+Pb collisions. Within a statistical model of the early stage, this is interpreted as a sign of the phase transition to a QGP, which causes a sharp change in the energy dependence of the strangeness to entropy ratio. This observation naturally motivates us to study the production of multistrange hyperons ($\Xi$, $\Omega$) as a function of the beam energy. Furthermore it was suggested that the kinematic freeze-out of $\Omega$ takes place directly at QGP hadronization. If this is indeed the case, the transverse momentum spectra of the $\Omega$ directly reflect the transverse expansion velocity of a hadronizing QGP. In this report we show preliminary NA49 results on $\Omega^{-}$ and $\bar{\Omega}^{+}$ production in central Pb+Pb collisions at 40 and 158 A$\cdot$GeV and compare them to measurements of $\Xi^{-}$ and $\bar{\Xi}^{+}$ production in central Pb+Pb collisions at 30, 40, 80 and 158 A$\cdot$GeV., Comment: Presented at 25th International School of Nuclear Physics, Erice, Italy, to be published in Progress in Particle and Nuclear Physics, 3 pages, 4 figures
Published: 2003

125. Observation of an Exotic S = -2, Q = -2 Baryon Resonance in Proton-Proton Collisions at the CERN SPS

Author: Alt, C, Anticic, T, Baatar, B, Barna, D, Bartke, Jerzy, Behler, M, Betev, L, Bialkowska, H, Billmeier, A, Blume, C, Boimska, B, Botje, M, Bracinik, J, Bramm, R, Brun, R, Buncic, P, Cerny, V, Christakoglou, P, Chvala, O, Cramer, J G, Csató, P, Darmenov, N, Dimitrov, A, Dinkelaker, P, Eckardt, V, Farantatos, G, Filip, P, Flierl, D, Fodor, Z, Foka, P, Freund, P, Friese, V, Gál, J, Gazdzicki, M, Georgopoulos, G, Gladysz-Dziadus, E, Hegyi, S, Höhne, C, Kadija, K, Karev, A, Kniege, S, Kolesnikov, V I, Kollegger, T, Korus, R, Kowalski, M, Kraus, I, Kreps, M, Van Leeuwen, M, Lévai, Peter, Litov, L, Makariev, M, Malakhov, A I, Markert, C, Mateev, M, Mayes, B W, Melkumov, G L, Meurer, C, Mischke, A, Mitrovski, M, Molnár, J, Mrówczynski, S, Pálla, G, Panagiotou, A D, Panayotov, D, Perl, K, Petridis, A, Pikna, M, Pinsky, L, Pühlhofer, F, Reid, J G, Renfordt, R E, Retyk, W, Roland, C, Roland, G, Rybczynski, M, Rybicki, A, Sandoval, A, Sann, H, Schmitz, N, Seyboth, P, Siklér, F, Sitár, B, Skrzypczak, E, Stefanek, G, Stock, R, Ströbele, H, Susa, T, Szentpétery, I, Sziklai, J, Trainor, T A, Varga, D, Vassiliou, Maria, Veres, G I, Vesztergombi, G, Vranic, D, Wetzler, A, Wlodarczyk, Z, Yoo, I K, Zaranek, J, and Zimányi, J
Subjects: Nuclear Theory, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract: Results of resonance searches in the $\Xi^{-} \pi^{-}, \Xi^{-} \pi^{+}, \bar{Xi}^{+} \pi-$ and $\bar{Xi}^{+} \pi^{+}$ invariant mass spectra in proton-proton collisions at $\sqrt{s}=17.2$ GeV are presented. Evidence is shown for the existence of a narrow $\Xi^{-} \pi^{-}$ baryon resonance with mass of 1.862+/-0.002 GeV/c^2 and width below the detector resolution of about 0.018 GeV/c^2. The significance is estimated to be 4.0 sigma. This state is a candidate for the hypothetical exotic $\Xi$$\_3$$\_/$$\_2$$^-$$^-$ baryon with S = -2, I = 3/2 and a quark content of $(d s d s \bar{u})$. At the same mass a peak is observed in the $\Xi^{-} \pi^{+}$ spectrum which is a candidate for the $\Xi$$^0$$\_3$$\_/$$\_2$ member of this isospin quartet with a quark content of $(d s u s \bar{d})$. The corresponding antibaryon spectra also show enhancements at the same invariant mass.
Published: 2003

126. Directed and elliptic flow of charged pions and protons in Pb+Pb collisions at 40 and 158 AGeV

Author: Alt, C, Anticic, T, Baatar, B, Barna, D, Bartke, J, Behler, M, Betev, L, Bialkowska, H, Billmeier, A, Blume, C, Boimska, B, Borghini, N, Botje, M, Bracinik, J, Bramm, R, Brun, R, Buncic, P, Cerny, V, Chvala, O, Cooper, G E, Cramer, J G, Csató, P, Dinh, P M, Dinkelaker, P, Eckardt, V, Filip, P, Fodor, Z, Foka, P, Freund, P, Friese, V, Gál, J, Gazdzicki, M, Georgopoulos, G, Gladysz-Dziadus, E, Hegyi, S, Höhne, C, Jacobs, P, Kadija, K, Karev, A, Kniege, S, Kolesnikov, V I, Kollegger, T, Korus, R, Kowalski, M, Kraus, I, Kreps, M, Van Leeuwen, M, Lévai, Peter, Malakhov, A I, Markert, C, Mayes, B W, Melkumov, G L, Meurer, C, Mischke, A, Mitrovski, M, Molnár, J, Mrówczynski, S, Odyniec, Grazyna Janina, Ollitrault, J Y, Pálla, G, Panagiotou, A D, Perl, K, Petridis, A, Pikna, M, Pinsky, L, Poskanzer, A M, Pühlhofer, F, Reid, J G, Renfordt, R, Retyk, W, Ritter, H G, Roland, C, Roland, G, Rybczynski, M, Rybicki, A, Sandoval, A, Sann, H, Schmitz, N, Seyboth, P, Siklér, F, Sitár, B, Skrzypczak, E, Snellings, R J, Stefanek, G, Stock, R, Ströbele, H, Susa, T, Szentpétery, I, Sziklai, J, Trainor, T A, Varga, D, Vassiliou, M, Veres, G I, Vesztergombi, G, Voloshin, S A, Vranic, D, Wetzler, A, Wlodarczyk, Z, Yoo, I K, Zaranek, J, and Zimányi, J
Subjects: Nuclear Theory, Nuclear Physics - Experiment, Nuclear Experiment
Abstract: Directed and elliptic flow measurements for charged pions and protons are reported as a function of transverse momentum, rapidity, and centrality for 40 and 158 AGeV Pb + Pb collisions as recorded by the NA49 detector. Both the standard method of correlating particles with an event plane, and the cumulant method of studying multiparticle correlations are used. In the standard method the directed flow is corrected for conservation of momentum. In the cumulant method elliptic flow is reconstructed from genuine 4, 6, and 8-particle correlations, showing the first unequivocal evidence for collective motion in A+A collisions at SPS energies.
Published: 2003

127. Directed and elliptic flow of charged pions and protons in Pb+Pb collisions at 40 and 158A GeV

Author: Alt, C, Anticic, T, Baatar, B, Barna, D, Bartke, J, Behler, M, Betev, L, Bialkowska, H, Billmeier, A, Blume, C, Boimska, B, Borghini, Nicolas, Botje, M, Bracinik, J, Bramm, R, Brun, R, Buncic, P, Cerny, V, Chvala, O, Cooper, GE, Cramer, JG, Csato, P, Dinh, PM, Dinkelaker, P, Eckardt, V, Filip, P, Fodor, Z, Foka, P, Freund, P, Friese, V, Gal, J, Gazdzicki, M, Georgopoulos, G, Gladysz, E, Hegyi, S, Hohne, C, Jacobs, P, Kadija, K, Karev, A, Kniege, S, Kolesnikov, VI, Kollegger, T, Korus, R, Kowalski, M, Kraus, I, Kreps, M, van Leeuwen, M, Levai, P, Malakhov, AI, Markert, C, Mayes, BW, Melkumov, GL, Meurer, C, Mischke, A, Mitrovski, M, Molnar, J, Mrowczynski, S, Odyniec, G, Ollitrault, JY, Palla, G, Panagiotou, AD, Perl, K, Petridis, A, Pikna, M, Pinsky, L, Poskanzer, AM, Puhlhofer, F, Reid, JG, Renfordt, R, Retyk, W, Ritter, HG, Roland, C, Roland, G, Rybczynski, M, Rybicki, A, Sandoval, A, Sann, H, Schmitz, N, Seyboth, P, Sikler, F, Sitar, B, Skrzypczak, E, Snellings, RJ, Stefanek, G, Stock, R, Strobele, H, Susa, T, Szentpetery, I, Sziklai, J, Trainor, TA, Varga, D, Vassiliou, M, Veres, GI, Vesztergombi, G, Voloshin, SA, Vranic, D, Wetzler, A, Wlodarczyk, Z, Yoo, IK, Zaranek, J, and Zimanyi, J
Subjects: FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: Directed and elliptic flow measurements for charged pions and protons are reported as a function of transverse momentum, rapidity, and centrality for 40 and 158A GeV Pb + Pb collisions as recorded by the NA49 detector. Both the standard method of correlating particles with an event plane, and the cumulant method of studying multiparticle correlations are used. In the standard method the directed flow is corrected for conservation of momentum. In the cumulant method elliptic flow is reconstructed from genuine 4, 6, and 8-particle correlations, showing the first unequivocal evidence for collective motion in A+A collisions at SPS energies., To be published in Phys. Rev. C, 37 pages, 29 figures, version accepted for publication, contains now a weblink to data shown in the figures: See http://na49info.cern.ch/na49/Archives/Data/FlowWebPage/
Published: 2003

128. Directed and elliptic flow of charged pions and protons in Pb + Pb collisions at 40A and 158A GeV

Author: Antičić, Tome, Alt, C., Baatar, B., Barna, D, Behler, M., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Boimska, B., Borghini, N., Botje, M., Bracinik, J., Bramm, R., Brun, R., Bunčcić, P., Cerny, V., Chvala, O., Cooper, G. E., Cramer, J. G., Csato, P., Dinh, P. M., Dinkelaker, P., Eckardt, V., Filip, P., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Hegyi, S., Hohne, C., Jacobs, P., Kadija, Krešo, Karev, A., Kniege, S., Kolesnikov, V.I., Kollegger, T., Korus, R., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Levai, P., Malakhov, A. I., Markert, C., Mayes, B. W., Melkumov, G. L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., Odyniec, G., Ollitrault, J.-Y., Palla, G., Panagiotou, A. D., Perl, K., Petridis, A., Pikna, M., Pinsky, L., Poskanzer, A. M., Puhlhofer, F., Reid, J. G., Renfordt, R., Retyk, W., Ritter, H. G., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Snellings, R.J., Stefanek, G., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trainor, T. A., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Voloshin, S. A., Vranić, Danilo, Wetzler, A., Wlodarczyk, Z., Yoo, I. K., Zaranek, J., and Zimanyi, J.
Subjects: Physics, Nuclear Experiment, charged pions, particle correlations
Abstract: Directed and elliptic flow measurements for charged pions and protons are reported as a function of transverse momentum, rapidity, and centrality for 40A and 158A GeV Pb + Pb collisions, as recorded by the NA49 detector. Both the standard method of correlating particles with an event plane and the cumulant method of studying multiparticle correlations are used. In the standard method the directed flow is corrected for conservation of momentum. In the cumulant method elliptic flow is reconstructed from genuine four-, six-, and eight-particle correlations, showing the first unequivocal evidence for collective motion in A + A collisions at SPS energies.
Published: 2003

129. Search for deconfinement in NA49 at the CERN SPS

Author: Afanasiev, S.V. Anticic, T. Barna, D. Bartke, J. Barton, R.A. Betev, L. Białkowska, H. Billmeier, A. Blume, C. Blyth, C.O. Boimska, B. Botje, M. Bracinik, J. Bramm, R. Brun, R. Bunčić, P. Cerny, V. Chvala, O. Cramer, J.G. Csató, P. Dinkelaker, P. Eckardt, V. Filip, P. Fischer, H.G. Fodor, Z. Foka, P. Freund, P. Friese, V. Gál, J. Gádzicki, M. Georgopoulos, G. Gładysz, E. Hegyi, S. Höhne, C. Jones, P.G. Kadija, K. Karev, A. Kolesnikov, V.I. Kollegger, T. Kowalski, M. Kraus, I. Kreps, M. Van Leeuwen, M. Lévai, P. Malakhov, A.I. Markert, C. Mayes, B.W. Melkumov, G.L. Mischke, A. Molnár, J. Nelson, J.M. Pálla, G. Panagiotou, A.D. Perl, K. Petridis, A. Pikna, M. Pinsky, L. Pühlhofer, F. Reid, J.G. Renfordt, R. Retyk, W. Roland, C. Roland, G. Rybicki, A. Sandoval, A. Sann, H. Schmitz, N. Seyboth, P. Siklér, F. Sitar, B. Skrzypczak, E. Squier, G.T.A. Stock, R. Ströbele, H. Susa, T. Szentpétery, I. Sziklai, J. Trainor, T.A. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vranić, D. Wenig, S. Wetzler, A. Yoo, I.K. Zaranek, J. Zimányi, J.
Published: 2003

130. System size dependence of strangeness production at 158 AGeV

Author: Hohne, C., Afanasiev, S.V., Antičić, Tome, Baatar, B., Barna, D., Bartke, J., Barton, R.A., Behler, M., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Blyth, C.O., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Filip, P., Fischer, H.G., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Hegyi, S., Igo, G., Jones, P.G., Kadija, Krešo, Karev, A., Kolesnikov, V.I., Kollegger, T., Kowalski, M., Kraus, I., Kreps, M., Levai, P., Malakhov, A.I., Margetis, S., Markert, C., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Nelson, J.M., Palla, G., Panagiotou, A.D., Perl, K., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J.G., Renfordt, R., Retyk, W., Roland, C., Roland, G., Rybicki, A., Sammer, T., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Squier, G.T.A., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wenig, S., Wetzler, A., Whitten, C., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: Nuclear Theory, strange particle production, NA49 experiment, Nuclear Experiment
Abstract: Strange particle production in A+A interactions at 158 AGeV is studied by the CERN experiment NA49 as a function of system size and collision geometry. Yields of charged kaons, phi and Lambda are measured and compared to those of pions in central C+C, Si+Si and centrality-selected Pb+Pb reactions. An overall increase of relative strangeness production with the size of the system is observed which does not scale with the number of participants. Arguing that rescattering of secondaries plays a minor role in small systems the observed strangeness enhancement can be related to the space-time density of the primary nucleon-nucleon collisions.
Published: 2003

131. Bose-Einstein correlations of charged kaons in central Pb + Pb collisions at Ebeam = 158 GeV per nucleon

Author: Afanasiev, S.V. Anticic, T. Baatar, B. Barna, D. Bartke, J. Barton, R.A. Behler, M. Betev, L. Białkowska, H. Billmeier, A. Blume, C. Blyth, C.O. Boimska, B. Botje, M. Bracinik, J. Bramm, R. Brun, R. Bunčić, P. Cerny, V. Chvala, O. Cramer, J.G. Csató, P. Dinkelaker, P. Eckardt, V. Filip, P. Fodor, Z. Foka, P. Freund, P. Friese, V. Gál, J. Gaździcki, M. Georgopoulos, G. Gładysz, E. Hegyi, S. Höhne, C. Igo, G. Jones, P.G. Kadija, K. Karev, A. Kolesnikov, V.I. Kollegger, T. Kowalski, M. Kraus, I. Kreps, M. Van Leeuwen, M. Lednicky, R. Lévai, P. Malakhov, A.I. Margetis, S. Markert, C. Mayes, B.W. Melkumov, G.L. Meurer, C. Mischke, A. Mitrovski, M. Molnár, J. Nelson, J.M. Pálla, G. Panagiotou, A.D. Perl, K. Petridis, A. Pikna, M. Pinsky, L. Pühlhofer, F. Reid, J.G. Renfordt, R. Retyk, W. Roland, C. Roland, G. Rybicki, A. Sammer, T. Sandoval, A. Sann, H. Schmitz, N. Seyboth, P. Siklér, F. Sitar, B. Skrzypczak, E. Squier, G.T.A. Stock, R. Ströbele, H. Susa, T. Szentpétery, I. Sziklai, J. Trainor, T.A. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vranić, D. Wetzler, A. Whitten, C. Yoo, I.K. Zaranek, J. Zimányi, J.
Subjects: Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Bose-Einstein correlations of charged kaons were measured near mid-rapidity in central Pb + Pb collisions at 158 A GeV by the NA49 experiment at the CERN SPS. Source radii were extracted using the Yano-Koonin-Podgoretsky and Bertsch-Pratt parameterizations. The results are compared to published pion and kaon data. The measured m⊥ dependence for kaons and pions is consistent with collective transverse expansion of the source and a freeze-out time of about 9.5 fm. © 2003 Published by Elsevier Science B.V.
Published: 2003

132. Recent results on spectra and yields from NA49

Author: Afanasiev, S.V., Antičić, Tome, Baatar, B., Barna, D., Bartke, J., Barton, R.A., Behler, M., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Blyth, C.O., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Filip, P., Fischer, H.G., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Hegyi, S., Hohne, C., Igo, G., Jones, P.G., Kadija, Krešo, Karev, A., Kolesnikov, V.I., Kollegger, T., Kowalski, M., Kraus, I., Kreps, M., Levai, P., Malakhov, A.I., Margetis, S., Markert, C., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Nelson, J.M., Palla, G., Panagiotou, A.D., Perl, K., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J.G., Renfordt, R., Retyk, W., Roland, C., Roland, G., Rybicki, A., Sammer, T., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Squier, G.T.A., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranić, Danilo, Wenig, S., Wetzler, A., Whitten, C., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: hadron production, central Pb+Pb collisions, NA49 experiment, High Energy Physics::Experiment, Nuclear Experiment
Abstract: The energy dependence of hadron production in central Pb+Pb collisions is presented and discussed. In particular, midrapidity $m_T$-spectra for $\pi^-$, $K^-$, $K^+$, $p$, $\bar{; ; p}; ; $, $d$, $\phi$, $\Lambda$ and $\bar{; ; \Lambda}; ; $ at 40, 80 and 158 $A$GeV are shown. In addition $\Xi$ and $\Omega$ spectra are available at 158 $A$GeV. The spectra allow to determine the thermal freeze-out temperature $T$ and the transverse flow velocity $\beta_T$ at the three energies. We do not observe a significant energy dependence of these parameters ; furthermore there is no indication of early thermal freeze-out of $\Xi$ and $\Omega$ at 158 $A$GeV. Rapidity spectra for $\pi^-$, $K^-$, $K^+$ and $\phi$ at 40, 80 and 158 $A$GeV are shown, as well as first results on $\Omega$ rapidity distributions at 158 $A$GeV. The chemical freeze-out parameters $T$ and $\mu_B$ at the three energies are determined from the total yields. The parameters are close to the expected phase boundary in the SPS energy range and above. Using the total yields of kaons and lambdas, the energy dependence of the strangeness to pion ratio is discussed. A maximum in this ratio is found at 40 $A$GeV. This maximum could indicate the formation of deconfined matter at energies above 40 $A$GeV. A search for open charm in a large sample of 158 $A$GeV events is presented. No signal is observed. This result is compared to several model predictions.
Published: 2003

133. Bose-Einstein Correlation of Charged Kaons in Central Pb+Pb Collisions at E(beam) = 158 AGeV

Author: Antičić, Tome, Afanasiev, S. V., Baatar, B., Barna, D., Bartke, J., Barton, R. A., Behler, M., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Blyth, C. O., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Chvala, O., Cramer, J. G., Csato, P., Dinkelaker, P., Eckardt, V., Filip, P., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Hegyi, S., Hohne, C., Igo, G., Jones, P. G., Kadija, Krešo, Karev, A., Kolesnikov, V. I., Kollegger, T., Kowalski, M., Kraus, I., Kreps, M., Lednicky, R., Levai, P., Malakhov, A. I., Margetis, S., Markert, C., Mayes, B. W., Melkumov, G. L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Nelson, J. M., Palla, G., Panagiotou, A. D., Perl, K., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J. G., Renfordt, R., Retyk, W., Roland, C., Roland, G., Rybicki, A., Sammer, T., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Squier, G. T. A., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trainor, T. A., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Vranić, Danilo, Wetzler, A., Whitten, C., Yoo, I. K., Zaranek, J., and Zimanyi, J.
Subjects: HBT, central Pb+Pb collision, NA49 experiment, Physics, Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Bose-Einstein correlations of charged kaons were measured near mid-rapidity in central Pb+Pb collisions at 158 A$\cdot$GeV by the NA49 experiment at the CERN SPS. Source radii were extracted using the Yano-Koonin-Podgoretsky and Bertsch-Pratt parameterizations. The results are compared to published pion data. The measured $m_\perp$ dependence for kaons and pions is consistent with collective transverse expansion of the source and a freeze-out time of about 9.5 $fm$.
Published: 2003

134. Energy dependence of Λ and Λ production at CERN-SPS Energies

Author: Mischke, A. Afanasiev, S.V. Anticic, T. Baatar, B. Barna, D. Bartke, J. Barton, R.A. Behler, M. Betev, L. Białkowska, H. Billmeier, A. Blume, C. Blyth, C.O. Boimska, B. Botje, M. Bracinik, J. Bramm, R. Brun, R. Bunčić, P. Cerny, V. Chvala, O. Cramer, J.G. Csató, P. Dinkelaker, P. Eckardt, V. Filip, P. Fischer, H.G. Fodor, Z. Foka, P. Freund, P. Friese, V. Gál, J. Gaździcki, M. Georgopoulos, G. Gładysz, E. Hegyi, S. Höhne, C. Igo, G. Jones, P.G. Kadija, K. Karev, A. Kolesnikov, V.I. Kollegger, T. Kowalski, M. Kraus, I. Kreps, M. Van Leeuwen, M. Lévai, P. Malakhoy, A.I. Margetis, S. Markert, C. Mayes, B.W. Melkumov, G.L. Meurer, C. Mitrovski, M. Molnár, J. Nelson, J.M. Pálla, G. Panagiotou, A.D. Perl, K. Petridis, A. Pikna, M. Pinsky, L. Pühlhofer, F. Reid, J.G. Renfordt, R. Retyk, W. Roland, C. Roland, G. Rybicki, A. Sammer, T. Sandoval, A. Sann, H. Schmitz, N. Seyboth, P. Siklér, F. Sitar, B. Skrzypczak, E. Squier, G.T.A. Stock, R. Ströbele, H. Susa, T. Szentpétery Sziklai, J. Trainor, T.A. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vranić, D. Wenig, S. Wetzler, A. Whitten, C. Yoo, I.K. Zaranek, J. Zimányi, J.
Abstract: Rapidity distributions for Λ and Λ hyperons in central Pb-Pb collisions at 40, 80 and 158 A·GeV and for Ks0 mesons at 158 A·GeV are presented. The lambda multiplicities are studied as a function of collision energy together with AGS and RHIC measurements and compared to model predictions. A different energy dependence of the Λ/π and Λ̄/π is observed. The Λ̄/Λ ratio shows a steep increase with collision energy. Evidence for a Λ̄/p̄ ratio greater than 1 is found at 40 A·GeV. © 2003 Elsevier Science B.V. All rights reserved.
Published: 2003

135. Cascade and anti-cascade+ production in central Pb+Pb collisions at 158 GeV/c per nucleon

Author: Afanasiev, S.V., Antičić, Tome, Barna, D., Bartkeg, J., Bartonc, R.A., Betev, L., Białkowska, H., Billmeier, A., Blume, C., Blyth, C.O., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Bunčić, Predrag, Cerny, V., Cramer, J.G., Csató, P., Dinkelaker, P., Eckardt, V., Filip, P., Fischer, H.G., Fodor, Z., Foka, P., Freund, P., Friese, V., Gál, J., Gazdzicki, M., Georgopoulos, G., Gładyszg, E., Hegyi, S., Höhne, C., Igon, G., Jones, P.G., Kadija, Krešo, Karev, K., Kolesnikov, V.I., Kollegger, T., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Lévai, P., Malakhov, A.I., Margetis, S., Markert, C., Mayes, B.W., Melkumov, G.L., Mischke, A., Molnár, J., Nelson, J.M., Pálla, G., Panagiotou, A.G., Perl, K., Petridis, A., Piknad, M., Pinsky, L., Pühlhofer, F., Reids, J.G., Renfordt, R., Retyk, W., Rolandt, C., Rolandt, G., Rybicki, A., Sammer, T., Sandoval, A., Sann, H., Schmitz, N., Seyboth, Peter, Siklér, F., Sitar, B., Skrzypczak, E., Squier, G.T.A., Stock, R., Ströbele, H., Šuša, Tatjana, Szentpétery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Verese, G.I., Vesztergombi, G., Vranić, Danilo, Wenig, S., Wetzler, A., Whitten, C., Yoo, I.K., Zaranek, J., and Zimányi, J.
Subjects: Cascade, Anticascade, Strangeness enhancement, Multi-strange hyperons, Integrated yields, Heavy-ion collisions, NA49
Abstract: Results of the production of capital Xi, Greek- and Image hyperons are presented for the 10% most central Pb+Pb interactions at 158 GeV/c per nucleon where the average number of participants Npart is about 335. This analysis utilises a global reconstruction procedure, which allows a measurement of 4small pi, Greek integrated yields to be made for the first time. Inverse slope parameters, which are determined from an exponential fit to the transverse mass spectra, are found to be 267± ; ; ; ; 9 MeV and 296± ; ; ; ; 17 MeV for capital Xi, Greek- and Image hyperons, respectively. Mid-rapidity densities (dN/dy) are found to be 1.49± ; ; ; ; 0.08 and 0.33± ; ; ; ; 0.04 particles per event per unit rapidity for capital Xi, Greek- and Image, respectively. The ratio Image at mid-rapidity, R(y=ycm), is found to be 0.22± ; ; ; ; 0.03. Yields integrated to full phase space are found to be 4.12± ; ; ; ; 0.20 and 0.77± ; ; ; ; 0.04 particles per event for capital Xi, Greek- and Image hyperons, respectively.
Published: 2003

136. Energy dependence of Lambda and bar\Lambda production at CERN-SPS Energies

Author: Afanasiev, S.V., Antičić, Tome, Baatar, B., Barna, D., Bartke, J., Barton, R.A., Behler, M., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Blyth, C.O., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Filip, P., Fischer, H.G., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Hegyi, S., Hohne, C., Igo, G., Jones, P.G., Kadija, Krešo, Karev, A., Kolesnikov, V.I., Kollegger, T., Kowalski, M., Kraus, I., Kreps, M., Levai, P., Malakhov, A.I., Margetis, S., Markert, C., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Nelson, J.M., Palla, G., Panagiotou, A.D., Perl, K., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J.G., Renfordt, R., Retyk, W., Roland, C., Roland, G., Rybicki, A., Sammer, T., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Squier, G.T.A., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranić, Danilo, Wenig, S., Wetzler, A., Whitten, C., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: lambda, anti-lambda production, NA49 experiment, central Pb+Pb collison, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Rapidity distributions for $\Lambda$ and $\bar{; ; \Lambda}; ; $ hyperons in central Pb-Pb collisions at 40, 80 and 158 A$\cdot$GeV and for ${; ; \rm K}; ; _{; ; s}; ; ^{; ; 0}; ; $ mesons at 158 A$\cdot$GeV are presented. The lambda multiplicities are studied as a function of collision energy together with AGS and RHIC measurements and compared to model predictions. A different energy dependence of the $\Lambda/\pi$ and $\bar{; ; \Lambda}; ; /\pi$ is observed. The $\bar{; ; \Lambda}; ; /\Lambda$ ratio shows a steep increase with collision energy. Evidence for a $\bar{; ; \Lambda}; ; /\bar{; ; \rm p}; ; $ ratio greater than 1 is found at 40 A$\cdot$GeV.
Published: 2003

137. Energy dependence of pion and kaon production in central Pb+Pb collisions

Author: Afanasiev, S.V., Anticic, T., Barna, D., Bartke, J., Barton, R.A., Behler, M., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Blyth, C.O., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Filip, P., Fischer, H.G., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Hegyi, S., Hohne, C., Igo, G., Jones, P.G., Kadija, K., Karev, A., Kolesnikov, V.I., Kollegger, T., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Levai, P., Malakhov, A.I., Margetis, S., Markert, C., Mayes, B.W., Melkumov, G.L., Mischke, A., Molnar, J., Nelson, John M., Palla, G., Panagiotou, A.D., Perl, K., Petridis, A., Pikna, M., Pinsky, Lawrence S., Puhlhofer, F., Reid, J.G., Renfordt, R., Retyk, W., Roland, C., Roland, G., Rybicki, A., Sammer, T., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Squier, G.T.A., Stock, R., Strobele, H., Susa, T., Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wenig, S., Wetzler, A., Whitten, C., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Particle physics, Meson, Nuclear Theory, Hadron, FOS: Physical sciences, Strangeness, High Energy Physics - Experiment, Baryon, Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, Strange matter, High Energy Physics - Phenomenology (hep-ph), Pion, Nuclear Physics - Experiment, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, Nucleon
Abstract: Measurements of charged pion and kaon production in central Pb+Pb collisions at 40, 80 and 158 AGeV are presented. These are compared with data at lower and higher energies as well as with results from p+p interactions. The mean pion multiplicity per wounded nucleon increases approximately linearly with s_NN^1/4 with a change of slope starting in the region 15-40 AGeV. The change from pion suppression with respect to p+p interactions, as observed at low collision energies, to pion enhancement at high energies occurs at about 40 AGeV. A non-monotonic energy dependence of the ratio of K^+ to pi^+ yields is observed, with a maximum close to 40 AGeV and an indication of a nearly constant value at higher energies.The measured dependences may be related to an increase of the entropy production and a decrease of the strangeness to entropy ratio in central Pb+Pb collisions in the low SPS energy range, which is consistent with the hypothesis that a transient state of deconfined matter is created above these energies. Other interpretations of the data are also discussed., revised version to appear in Phys. Rev. C, 33 pages including 11 figures
Published: 2002
Full Text: View/download PDF

138. Bose-Einstein Correlations of Charged Kaons in Central Pb+Pb Collisions at $E_{beam} = 158 AGeV$

Author: Afanasiev, S.V., Anticic, T., Baatar, B., Barna, D., Bartke, J., Barton, R.A., Behler, M., Betev, L., Białkowska, H., Billmeier, A., Blume, C., Blyth, C.O., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Bunčić, P., Cerny, V., Chvala, O., Cramer, J.G., Csató, P., Dinkelaker, P., Eckardt, V., Filip, P., Fodor, Z., Foka, P., Freund, P., Friese, V., Gál, J., Gaździcki, M., Georgopoulos, G., Gładysz, E., Hegyi, S., Höhne, C., Igo, G., Jones, P.G., Kadija, K., Karev, A., Kolesnikov, V.I., Kollegger, T., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Lednicky, R., Lévai, P., Malakhov, A.I., Margetis, S., Markert, C., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnár, J., Nelson, John M., Pálla, G., Panagiotou, A.D., Perl, K., Petridis, A., Pikna, M., Pinsky, Lawrence S., Pühlhofer, F., Reid, J.G., Renfordt, R., Retyk, W., Roland, C., Roland, G., Rybicki, A., Sammer, T., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Siklér, F., Sitar, B., Skrzypczak, E., Squier, G.T.A., Stock, R., Ströbele, H., Susa, T., Szentpétery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranić, D., Wetzler, A., Whitten, C., Yoo, I.K., Zaranek, J., and Zimányi, J.
Subjects: Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment, Nuclear Physics
Abstract: Bose-Einstein correlations of charged kaons were measured near mid-rapidity in central Pb+Pb collisions at 158 A$\cdot$GeV by the NA49 experiment at the CERN SPS. Source radii were extracted using the Yano-Koonin-Podgoretsky and Bertsch-Pratt parameterizations. The results are compared to published pion data. The measured $m_\perp$ dependence for kaons and pions is consistent with collective transverse expansion of the source and a freeze-out time of about 9.5 $fm$. Bose-Einstein correlations of charged kaons were measured near mid-rapidity in central Pb+Pb collisions at 158 A$\cdot$GeV by the NA49 experiment at the CERN SPS. Source radii were extracted using the Yano-Koonin-Podgoretsky and Bertsch-Pratt parameterizations. The results are compared to published pion data. The measured $m_\perp$ dependence for kaons and pions is consistent with collective transverse expansion of the source and a freeze-out time of about 9.5 $fm$ Bose–Einstein correlations of charged kaons were measured near mid-rapidity in central Pb+Pb collisions at 158 A GeV by the NA49 experiment at the CERN SPS. Source radii were extracted using the Yano–Koonin–Podgoretsky and Bertsch–Pratt parameterizations. The results are compared to published pion and kaon data. The measured m ⊥ dependence for kaons and pions is consistent with collective transverse expansion of the source and a freeze-out time of about 9.5 fm. Bose-Einstein correlations of charged kaons were measured near mid-rapidity in central Pb+Pb collisions at 158 A$\cdot$GeV by the NA49 experiment at the CERN SPS. Source radii were extracted using the Yano-Koonin-Podgoretsky and Bertsch-Pratt parameterizations. The results are compared to published pion data. The measured $m_\perp$ dependence for kaons and pions is consistent with collective transverse expansion of the source and a freeze-out time of about 9.5 $fm$.
Published: 2002

139. Energy Dependence of $\Lambda$ and $\bar{\Lambda}$ Production at CERN-SPS Energies

Author: Mischke, A., Afanasiev, S.V., Anticic, T., Baatar, B., Barna, D., Bartke, J., Barton, R.A., Behler, M., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Blyth, C.O., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Filip, P., Fischer, H.G., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Hegyi, S., Hohne, C., Igo, G., Jones, P.G., Kadija, K., Karev, A., Kolesnikov, V.I., Kollegger, T., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Levai, P., Malakhov, A.I., Margetis, S., Markert, C., Mayes, B.W., Melkumov, G.L., Meurer, C., Mitrovski, M., Molnar, J., Nelson, John M., Palla, G., Panagiotou, A.D., Perl, K., Petridis, A., Pikna, M., Pinsky, Lawrence S., Puhlhofer, F., Reid, J.G., Renfordt, R., Retyk, W., Roland, C., Roland, G., Rybicki, A., Sammer, T., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Squier, G.T.A., Stock, R., Strobele, H., Susa, T., Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wenig, S., Wetzler, A., Whitten, C., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Physics - Experiment, Nuclear Experiment
Abstract: Rapidity distributions for $\Lambda$ and $\bar{\Lambda}$ hyperons in central Pb-Pb collisions at 40, 80 and 158 A$\cdot$GeV and for ${\rm K}_{s}^{0}$ mesons at 158 A$\cdot$GeV are presented. The lambda multiplicities are studied as a function of collision energy together with AGS and RHIC measurements and compared to model predictions. A different energy dependence of the $\Lambda/\pi$ and $\bar{\Lambda}/\pi$ is observed. The $\bar{\Lambda}/\Lambda$ ratio shows a steep increase with collision energy. Evidence for a $\bar{\Lambda}/\bar{\rm p}$ ratio greater than 1 is found at 40 A$\cdot$GeV. Rapidity distributions for $\Lambda$ and $\bar{\Lambda}$ hyperons in central Pb-Pb collisions at 40, 80 and 158 A$\cdot$GeV and for ${\rm K}_{s}^{0}$ mesons at 158 A$\cdot$GeV are presented. The lambda multiplicities are studied as a function of collision energy together with AGS and RHIC measurements and compared to model predictions. A different energy dependence of the $\Lambda/\pi$ and $\bar{\Lambda}/\pi$ is observed. The $\bar{\Lambda}/\Lambda$ ratio shows a steep increase with collision energy. Evidence for a $\bar{\Lambda}/\bar{\rm p}$ ratio greater than 1 is found at 40 A$\cdot$GeV.
Published: 2002

140. Search for Deconfinement in NA49 at the CERN SPS

Author: Seyboth, Peter, Afanasiev, S.V., Anticic, T., Barna, D., Bartke, J., Barton, R.A., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Blyth, C.O., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Filip, P., Fischer, H.G., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Hegyi, S., Hohne, C., Jones, P.G., Kadija, K., Karev, A., Kolesnikov, V.I., Kollegger, T., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Levai, P., Malakhov, A.I., Markert, C., Mayes, B.W., Melkumov, G.L., Mischke, A., Molnar, J., Nelson, John M., Palla, G., Panagiotou, A.D., Perl, K., Petridis, A., Pikna, M., Pinsky, Lawrence S., Puhlhofer, F., Reid, J.G., Renfordt, R., Retyk, W., Roland, C., Roland, G., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Squier, G.T.A., Stock, R., Strobele, H., Susa, T., Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wenig, S., Wetzler, A., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: Physics, Particle physics, Large Hadron Collider, Physics::Instrumentation and Detectors, Detector, Nuclear Theory, FOS: Physical sciences, General Physics and Astronomy, Deconfinement, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Particle, High Energy Physics::Experiment, Nuclear Experiment, Beam energy, Particle Physics - Experiment, Nuclear Physics
Abstract: Experiment NA49 at the Cern SPS uses a large acceptance detector for a systematic study of particle yields and correlations in nucleus-nucleus, nucleon-nucleus and nucleon-nucleon collisions. Preliminary results for Pb+Pb collisions at 40, 80 and 158 A*GeV beam energy are shown and compared to measurements at lower and higher energies., contribution to ICPAQGP2001, Jaipur, India
Published: 2002

141. Progress Report and Beam Request for 2002: addendum-10 to proposal CERN-SPSC-P-264

Author: Afanasiev, S V, Anticic, T, Barna, D, Bartke, J, Barton, R A, Betev, L, Bialkowska, H, Billmeier, A, Blume, C, Blyth, C O, Boimska, B, Botje, M, Bracinik, J, Bramm, R, Brun, R, Buncic, P, Cerny, V, Chvala, O, Cramer, J G, Csató, P, Dinkelaker, P, Eckardt, V, Filip, P, Fischer, H G, Fodor, Z, Foka, P, Freund, P, Friese, V, Gál, J, Gazdzicki, M, Georgopoulos, G, Gladysz-Dziadus, E, Hegyi, S, Höhne, C, Jones, P G, Kadija, K, Karev, A, Kolesnikov, V I, Kollegger, T, Kowalski, M, Kraus, I, Kreps, M, Van Leeuwen, M, Lévai, Peter, Malakhov, A I, Markert, C, Mayes, B W, Melkumov, G L, Mischke, A, Molnár, J, Nelson, J M, Pálla, G, Panagiotou, A D, Perl, K, Petridis, A, Pikna, M, Pinsky, L, Pühlhofer, F, Reid, J G, Renford, R, Retyk, W, Roland, C, Roland, G, Rybicki, A, Sandoval, A, Sann, H, Schmitz, N, Seyboth, P, Siklér, F, Sitár, B, Skrzypczak, E, Squier, G T A, Stock, R, Ströbele, H, Susa, T, Szentpétery, I, Sziklai, J, Trainor, T A, Varga, D, Vassiliou, M, Veres, G I, Vesztergombi, G, Vranic, D, Wenig, S, Wetzler, A, Yoo, I K, Zaranek, J, and Zimányi, J
Subjects: Detectors and Experimental Techniques
Published: 2002

142. New results from NA49

Author: Antičić, Tome, Afanasev, S.V., Baechler, J., Barna, D., Barnby, L. S., Bartke, J., Barton, R. A., Behler, M., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Blyth, C. O., Boimska, B., Botje, M., Bracinik, J., Brady, F. P., Bramm, R., Brun, R., Buncic, P., Carr, L., Cebra, D., Cerny, V., Cooper, G. E., Cramer, J. G., Csato, P., Dinkelaker, P., Eckardt, V., Eckhardt, F., Ferenc, D., Filip, P., Fischer, H. G., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Ganz, R., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Harris, J. W., Hegyi, S., Hohne, C., Igo, G., Jacobs, P., Jones, P. G., Kadija, Krešo, Kolesnikov, V. I., Kollegger, T., Kowalski, M., Kraus, I., Kreps, M., Lasiuk, B., Levai, P., Malakhov, A.I., Margetis, S., Markert, C., Mayes, B. W., Melkumov, G. L., Mischke, A., Molnar, J., Nelson, J. M., Odyniec, G., Oldenburg, M. D., Palla, G., Panagiotou, A. D., Perl, K., Petridis, A., Pikna, M., Pinsky, L., Poskanzer, A. M., Prindle, D. J., Puhlhofer, F., Putschke, J., Reid, J. G., Renfordt, R., Retyk, W., Ritter, H. G., Rohrich, D., Roland, C., Roland, G., Rybicki, A., Sammer, T., Sandoval, A., Sann, H., Schafer, E., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Snellings, R., Squier, G. T. A., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Toy, M., Trainor, T. A., Trentalange, S., Ullrich, T., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Voloshin, S., Vranić, Danilo, Wang, F., Weerasundara, D. D., Wenig, S., Wetzler, A., Whitten, C., Xu, N., Yates, T. A., Yoo, I. K., Zaranek, J., and Zimanyi, J.
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Lead (geology), chemistry, Silicon, Nuclear Theory, chemistry.chemical_element, High Energy Physics::Experiment, Nuclear Experiment, Carbon, Central region
Abstract: Recent results of the NA49 experiment are presented. These cover first results on pion and kaon production, HBT, and charge fluctuations from Pb+Pb reactions at 40A GeV and their comparison to 158A GeV beam energy. Furthermore a study on baryon number transfer in p+p, centrality selected p+Pb and Pb+Pb collisions at 158A GeV and new results on the system size dependence of kaon yields, including C+C and Si+Si data, are presented. Additionally, a first result on $\Lambda$ $\Lambda$ correlations is shown.
Published: 2002

143. NA49 Data Taking in 2002

Author: Afanasiev, S V, Anticic, T, Barna, D, Bartke, Jerzy, Barton, R A, Betev, L, Bialkowska, H, Billmeier, A, Blume, C, Blyth, C O, Boimska, B, Botje, M, Bracinik, J, Bramm, R, Brun, R, Buncic, P, Cerny, V, Cramer, J G, Csató, P, Dinkelaker, P, Eckardt, V, Filip, P, Fodor, Z, Foka, P, Freund, P, Friese, V, Gál, J, Gazdzicki, M, Georgopoulos, G, Gladysz-Dziadus, E, Hegyi, S, Höhne, C, Jones, P G, Kadija, K, Karev, A, Kolesnikov, V I, Kollegger, T, Kowalski, M, Kraus, I, Kreps, M, Van Leeuwen, M, Lévai, Peter, Malakhov, A I, Markert, C, Mayes, B W, Melkumov, G L, Mischke, A, Molnár, J, Nelson, J M, Pálla, G, Panagiotou, A D, Perl, K, Petridis, A, Pikna, M, Pinsky, L, Pühlhofer, F, Reid, J G, Renfordt, R, Retyk, W, Roland, C, Roland, G, Rybicki, A, Sandoval, A, Sann, H, Schmitz, N, Seyboth, P, Siklér, F, Sitár, B, Skrzypczak, E, Squier, T A, Stock, R, Ströbele, H, Susa, T, Szentpétery, I, Sziklai, J, Trainor, T A, Varga, D, Vassiliou, Maria, Veres, I, Vesztergombi, G, Vranic, D, Wetzler, A, Yoo, I K, and Zaranek, J
Subjects: Detectors and Experimental Techniques
Published: 2002

144. Lambda production in central Pb+Pb collisions at CERN-SPS energies

Author: Afanasiev, S.V., Antičić, Tome, Barna, D., Bartke, J., Barton, R.A., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Blyth, C.O., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Filip, P., Fischer, H.G., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Hegyi, S., Hohne, C., Igo, G., Jones, P.G., Kadija, Krešo, Karev, A., Kolesnikov, V.I., Kollegger, T., Kowalski, M., Kraus, I., Kreps, M., Levai, P., Malakhov, A.I., Margetis, S., Markert, C., Mayes, B.W., Melkumov, G.L., Molnar, J., Nelson, J.M., Palla, G., Panagiotou, A.D., Perl, K., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J.G., Renfordt, R., Retyk, W., Roland, C., Roland, G., Rybicki, A., Sammer, T., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Squier, G.T.A., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranić, Danilo, Wenig, S., Wetzler, A., Whitten, C., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: lambda production, NA49 experiment, central PbPb collision, High Energy Physics::Experiment, Nuclear Experiment
Abstract: In this paper we present recent results from the NA49 experiment for $\Lambda$ and $\bar{; ; \Lambda}; ; $ hyperons produced in central Pb+Pb collisions at 40, 80 and 158 A$\cdot$GeV. Transverse mass spectra and rapidity distributions for $\Lambda$ are shown for all three energies. The shape of the rapidity distribution becomes flatter with increasing beam energy. The multiplicities at mid-rapidity as well as the total yields are studied as a function of collision energy including AGS measurements. The ratio $\Lambda/\pi$ at mid-rapidity and in 4$\pi$ has a maximum around 40 A$\cdot$GeV. In addition, $\bar{; ; \Lambda}; ; $ rapidity distributions have been measured at 40 and 80 A$\cdot$GeV, which allows to study the $\bar{; ; \Lambda}; ; $/$\Lambda$ ratio.
Published: 2002

145. New results from NA49

Author: Blume, C. Afanasiev, S.V. Anticic, T. Bächler, J. Barna, D. Barnby, L.S. Bartke, J. Barton, R.A. Behler, M. Betev, L. Białkowska, H. Billmeier, A. Blume, C. Blyth, C.O. Boimska, B. Botje, M. Brancinik, J. Brady, F.P. Bramm, R. Brun, R. Bunčić, P. Carr, L. Cebra, D. Cerny, V. Cooper, G.E. Cramer, J.G. Csató, P. Dinkelaker, P. Eckardt, V. Eckhardt, F. Ferenc, D. Filip, P. Fischer, H.G. Fodor, Z. Foka, P. Freund, P. Friese, V. Gál, J. Ganz, R. Gaździcki, M. Georgopoulos, G. Gładysz, E. Harris, J.W. Hegyi, S. Höhne, C. Igo, G. Jacobs, P. Jones, P.G. Kadija, K. Kolesnikov, V.I. Kollegger, T. Kowalski, M. Kraus, I. Kreps, M. Lasiuk, B. van Leeuwen, M. Lévai, P. Malakhov, A.I. Margetis, S. Markert, C. Mayes, B.W. Melkumov, G.L. Mischke, A. Molnár, J. Nelson, J.M. Odyniec, G. Oldenburg, M.D. Pálla, G. Panagiotou, A.D. Perl, K. Petridis, A. Pikna, M. Pinsky, L. Poskanzer, A.M. Prindle, D.J. Pühlhofer, F. Putschke, J. Reid, J.G. Renfordt, R. Retyk, W. Ritter, H.G. Röhrich, D. Roland, C. Roland, G. Rybicki, A. Sammer, T. Sandoval, A. Sann, H. Schäfer, E. Schmitz, N. Seyboth, P. Siklér, F. Sitar, B. Skrzypczak, E. Snellings, R. Squier, C.T.A. Stock, R.
Published: 2002

146. Ξ- and Ξ+ production in central Pb + Pb collisions at 158 GeV/c per nucleon

Author: Afanasiev, S.V. Anticic, T. Barna, D. Bartke, J. Barton, R.A. Betev, L. Bialkowska, H. Billmeier, A. Blume, C. Blyth, C.O. Boimska, B. Botje, M. Bracinik, J. Bramm, R. Brun, R. Bunči, P. Cerny, V. Cramer, J.G. Csató, P. Dinkelaker, P. Eckardt, V. Filip, P. Fischer, H.G. Fodor, Z. Foka, P. Freund, P. Friese, V. Gál, J. Gadzicki, M. Georgopoulos, G. Gladysz, E. Hegyi, S. Höhne, C. Igo, G. Jones, P.G. Kadija, K. Karev, A. Kolesnikov, V.I. Kollegger, T. Kowalski, M. Kraus, I. Kreps, M. Van Leeuwen, M. Lévai, P. Malakhov, A.I. Margetis, S. Markert, C. Mayes, B.W. Melkumov, G.L. Mischke, A. Molnár, J. Nelson, J.M. Pálla, G. Panagiotou, A.D. Perl, K. Petridis, A. Pikna, M. Pinsky, L. Pühlhofer, F. Reid, J.G. Renfordt, R. Retyk, W. Roland, C. Roland, G. Rybicki, A. Sammer, T. Sandoval, A. Sann, H. Schmitz, N. Seyboth, P. Siklér, F. Sitar, B. Skrzypczak, E. Squier, G.T.A. Stock, R. Ströbele, H. Susa, T. Szentpétery, I. Sziklai, J. Trainor, T.A. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vrani, D. Wenig, S. Wetzler, A. Whitten, C. Yoo, I.K. Zaranek, J. Zimányi, J.
Abstract: Results of the production of Ξ- and Ξ+ hyperons are presented for the 10% most central Pb + Pb interactions at 158 GeV/c per nucleon where the average number of participants Npart is about 335. This analysis utilises a global reconstruction procedure, which allows a measurement of 4π integrated yields to be made for the first time. Inverse slope parameters, which are determined from an exponential fit to the transverse mass spectra, are found to be 267 ± 9 MeV and 296 ± 17 MeV for Ξ- and Ξ+ hyperons, respectively. Mid-]rapidity densities (dN/dy) are found to be 1.49 ± 0.08 and 0.33 ± 0.04 particles per event per unit rapidity for Ξ- and Ξ+, respectively. The ratio R(Ξ+/Ξ-) at mid-rapidity, R(y = Ycm), is found to be 0.22 ± 0.03. Yields integrated to full phase space are found to be 4.12 ± 0.20 and 0.77 ± 0.04 particles per event for Ξ- and Ξ+ hyperons, respectively. ©2002 Elsevier Science B.V. All rights reserved.
Published: 2002

147. Search for deconfinement in A49 at the CERN SPS

Author: Seyboth, P. Afanasiev, S.V. Anticic, T. Barna, D. Bartke, J. Barton, R.A. Betev, L. Bialkowska, H. Billmeier, A. Blume, C. Blyth, C.O. Boimska, B. Botje, M. Bracinik, J. Bramm, R. Brun, R. Bunčić, P. Cerny, V. Chvala, O. Cramer, J.G. Csató, P. Dinkelaker, P. Eckardt, V. Filip, P. Fischer, H.G. Fodor, Z. Foka, P. Freund, P. Friese, V. Gá, J. Gaździcki, M. Georgopoulos, G. Gładysz, E. Hegyi, S. Höhne, C. Jones, P.G. Kadija, K. Karev, A. Kolesnikov, V.I. Kollegger, T. Kowalski, M. Kraus, I. Kreps, M. van Leeuwen, M. Lévai, P. Malakhov, A.I. Markert, C. Mayes, B.W. Melkumov, G.L. Mischke, A. Molnár, J. Nelson, J.M. Pálla, G. Panagiotou, A.D. Perl, K. Petridis, A. Pikna, M. Pinsky, L. Pühlhofer, F. Reid, J.G. Renfordt, R. Retyk, W. Roland, C. Roland, G. Rybicki, A. Sandoval, A. Sann, H. Schmitz, N. Seyboth, P. Sikĺer, F. Sitar, B. Skrzypczak, E. Squier, G.T.A. Stock, R. Ströbele, H. Susa, T. Szentpétery, I. Sziklai, J. Trainor, T.A. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vranić, D. Wenig, S. Wetzler, A. Yoo, I.K. Zaranek, J. Zimányi, J.
Subjects: Physics::Instrumentation and Detectors, Nuclear Experiment
Abstract: Experiment NA49 at the Cern SPS has performed large acceptance measurements of hadron production in pp, pPb, CC, SiSi and PbPb collisions at 40 and 158 A · GeV beam energies. These data allowed a study of particle yields, spectra and correlations as well as event-by-event fluctuations of average event properties of the created hadron system. Results from central PbPb collisions are consistent with the onset of deconfinement during the early stage of the reaction in the lower SPS energy range. A new scaling property of particle production ratios was found which relates collision systems of different size and centrality. Systematics of the evolution of particle production from pp via pPb to PbPb collisions were investigated.
Published: 2002

148. Lambda production in central Pb + Pb collisions at CERN-SPS energies

Author: Mischke, A. Afanasiev, S.V. Anticic, T. Barna, D. Bartke, J. Barton, R.A. Betev, L. Białkowska, H. Billmeier, A. Blume, C. Blyth, C.O. Boimska, B. Botje, M. Bracinik, J. Bramm, R. Brun, R. Bunčić, P. Cerny, V. Cramer, J.G. Csató, P. Dinkelaker, P. Eckardt, V. Filip, P. Fischer, H.G. Fodor, Z. Foka, P. Freund, P. Friese, V. Gál, J. Gaździcki, M. Georgopoulos, G. Gładysz, E. Hegyi, S. Hóhne, C. Igo, G. Jones, P.G. Kadija, K. Karev, A. Kolesnikov, V.I. Kollegger, T. Kowalski, M. Kraus, I. Kreps, M. Lévai, P. Malakhov, A.I. Margetis, S. Markert, C. Mayes, B.W. Melkumov, G.L. Mischke, A. Molnár, J. Nelson, J.M. Pálla, G. Panagiotou, A.D. Perl, K. Petridis, A. Pikna, M. Pinsky, L. Pühlhofer, F. Reid, J.G. Renfordt, R. Retyk, W. Roland, C. Roland, G. Rybicki, A. Sammer, T. Sandoval, A. Sann, H. Schmitz, N. Seyboth, P. Siklér, F. Sitar, B. Skrzypczak, E. Squier, G.T.A. Stock, R. Ströbele, H. Susa, T. Szentpétery, I. Sziklai, J. Trainor, T.A. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vranić, D. Van Leeuwen, M. Wenig, S. Wetzler, A. Whitten, C. Yoo, I.K. Zaranek, J. Zimányi, J.
Abstract: In this paper we present recent results from the NA49 experiment for Λ and Λ̄ hyperons produced in central Pb + Pb collisions at 40, 80 and 158 A GeV. Transverse mass spectra and rapidity distributions for Λ are shown for all three energies. The shape of the rapidity distribution becomes flatter with increasing beam energy. The multiplicities at mid-rapidity as well as the total yields are studied as a function of collision energy including AGS measurements. The ratio Λ/π at mid-rapidity and in 4π has a maximum around 40 A GeV, In addition, Λ̄ rapidity distributions have been measured at 40 and 80 A GeV, which allows us to study the Λ̄/Λ ratio.
Published: 2002

149. Xi^- and anti-Xi^+ Production in Central Pb+Pb Collisions at 158 GeV/c per Nucleon

Author: Antičić, Tome, Afanasiev, S. V., Barna, D., Bartke, J., Barton, R. A., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Blyth, C. O., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Cramer, J. G., Csato, P., Dinkelaker, P., Eckardt, V., Filip, P., Fischer, H. G., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Hegyi, S., Hohne, C., Igo, G., Jones, P. G., Kadija, Krešo, Karev, A., Kolesnikov, V. I., Kollegger, T., Kowalski, M., Kraus, I., Kreps, M., Levai, P., Malakhov, A.I., Margetis, S., Markert, C., Mayes, B. W., Melkumov, G. L., Mischke, A., Molnar, J., Nelson, J. M., Palla, G., Panagiotou, A. D., Perl, K., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J. G., Renfordt, R., Retyk, W., Roland, C., Roland, G., Rybicki, A., Sammer, T., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Squier, G. T. A., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trainor, T. A., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Vranić, Danilo, Wenig, S., Wetzler, A., Whitten, C., Yoo, I. K., Zaranek, J., and Zimany, J.
Subjects: Physics, cascade production, central Pb+Pb collisions, NA49 experiment
Abstract: Results of the production of Xi and Xi-bar hyperons in central Pb+Pb interactions at 158 GeV/c per nucleon are presented. This analysis utilises a global reconstruction procedure, which allows a measurement of 4pi integrated yields to be made for the first time. Inverse slope paramters, which are determined from an exponential fit to the transverse mass spectra, are shown. Central rapidity densities are found to be 1.49 +- 0.08 and 0.33 +- 0.04 per event per unit of rapidity for Xi and Xi-bar respectively. Yields integrated to full phase space are 4.12 +- 0.02 and 0.77 +- 0.04 for Xi and Xi-bar. The ratio of Xi-bar/Xi at mid-rapidity is 0.22 +- 0.03.
Published: 2002

150. Energy dependence of pion and kaon production in central Pb+Pb collisions

Author: Afanasiev, S.V. Anticic, T. Barna, D. Bartke, J. Barton, R.A. Behler, M. Betev, L. Białkowska, H. Billmeier, A. Blume, C. Blyth, C.O. Boimska, B. Botje, M. Bracinik, J. Bramm, R. Brun, R. Bunčić, P. Cerny, V. Cramer, J.G. Csató, P. Dinkelaker, P. Eckhardt, V. Filip, P. Fodor, Z. Foka, P. Freund, P. Friese, V. Gál, J. Gaździcki, M. Georgopoulos, G. Gładysz, E. Hegyi, S. Höhne, C. Igo, G. Jones, P.G. Kadija, K. Karev, A. Kolesnikov, V.I. Kollegger, T. Kowalski, M. Kraus, I. Kreps, M. Van Leeuwen, M. Lévai, P. Malakhov, A.I. Margetis, S. Markert, C. Mayes, B.W. Melkumov, G.L. Mischke, A. Molnár, J. Nelson, J.M. Pálla, G. Panagiotou, A.D. Perl, K. Petridis, A. Pikna, M. Pinsky, L. Pühlhofer, F. Reid, J.G. Renfordt, R. Retyk, W. Roland, C. Roland, G. Rybicki, A. Sammer, T. Sandoval, A. Sann, H. Schmitz, N. Seyboth, P. Siklér, F. Sitar, B. Skrzypczak, E. Squier, G.T.A. Stock, R. Ströbele, H. Susa, T. Szentpétery, I. Sziklai, J. Trainor, T.A. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vranić, D. Wetzler, A. Whitten, C. Yoo, I.K. Zaranek, J. Zimányi, J.
Subjects: Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Measurements of charged pion and kaon production in central Pb+Pb collisions at 40, 80, and 158 A GeV are presented. These are compared with data at lower and higher energies as well as with results from p+p interactions. The mean pion multiplicity per wounded nucleon increases approximately linearly with sNN1/4 with a change of slope starting in the region 15-40 A GeV. The change from pion suppression with respect to p+p interactions, as observed at low collision energies, to pion enhancement at high energies occurs at about 40A GeV. A nonmonotonic energy dependence of the ratio of K+ to π+ yields is observed, with a maximum close to 40A GeV and an indication of a nearly constant value at higher energies. The measured dependences may be related to an increase of the entropy production and a decrease of the strangeness to entropy ratio in central Pb+Pb collisions in the low SPS energy range, which is consistent with the hypothesis that a transient state of deconfined matter is created above these energies. Other interpretations of the data are also discussed.
Published: 2002

Catalog

Books, media, physical & digital resources

See catalog results

Searchworks

Select search scope, currently: Articles Catalog books, media & more in Jio Institute collections Articles journal articles & other e-resources

Search

Search Constraints

Refine your results

Search Limiters

Topic

Publication Year Range

Language

Publication Type

Journal

Database

Publisher

464 results on '"Hegyi, S."'

Search Results

Catalog

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources