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26 results on '"S Hegyi"'

1. Energy dependence of Λ and production at CERN-SPS energies

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Meson, High Energy Physics::Phenomenology, Hyperon, Lambda, High Energy Physics::Experiment, Production (computer science), Rapidity, Nuclear Experiment, Energy (signal processing), Bar (unit)
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
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2. Ξ− and production in central Pb+Pb collisions at 158 GeV/c per nucleon

Author

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

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Cascade, Phase space, Hyperon, Inverse, Transverse mass, Rapidity, Nucleon, Spectral line
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
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3. Correlation studies in quark jets using combinants

Author

S Hegyi

Subjects
Quark, Physics, Nuclear and High Energy Physics, symbols.namesake, Particle physics, Superposition principle, symbols, Multiplicity (mathematics), Rapidity, Poisson distribution, Cluster analysis
Abstract

A brief summary of the basic properties of combinants is provided. Their behavior is analysed using the Opal multiplicity data for light quark jets in restricted rapidity bins. For | Δy |≤1 the combinants do not exclude clustering effects with Poisson superposition. For | Δy |≤2 this pattern of correlations is ruled out by the sign-changing oscillations of combinants, as well as other models which predict oscillations alternating in sign. The future experimental possibilities concerning combinants are discussed.

Published
1999
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4. Baryon Stopping and Charged Particle Distributions in CentralPb+PbCollisions at 158 GeV per Nucleon

Author

C. Roland, Rainer Arno Ernst Renfordt, S. Margetis, A. Piper, N. Xu, Andrzej Rybicki, Jeffrey G. Reid, H. Ströbele, C. A. Whitten, Rene Brun, C. Bormann, P. Foka, R. Brockmann, R. Ganz, H. Hümmler, Ferenc Sikler, Lee Stuart Barnby, H. L. Caines, Norbert Schmitz, D. D. Weerasundara, Peter Graham Jones, Andreas Petridis, J. Sziklai, T. Ullrich, V. Friese, D. Schmischke, B. Boimska, E. Schäfer, Helena Bialkowska, F. Eckhardt, J. Gál, A. Yu. Semenov, J. Bächler, S. Hegyi, G. L. Melkumov, C. O. Blyth, W. Retyk, S. Schönfelder, Gyorgy Vesztergombi, M. Vassiliou, W. Geist, M. Fuchs, G. Roland, Siegfried Wenig, L. Wood, R. Zybert, A. Sandoval, R.J. Porter, Thomas A. Trainor, Alexander Malakhov, H. Appelshäuser, H. G. Fischer, G. Igo, M. Oldenburg, J. Dunn, D. Irmscher, H. Sann, S. Poziombka, D. Cebra, J. Günther, S. Trentalange, M. I. Ferguson, A. M. Poskanzer, Apostolos Panagiotou, S. J. Bailey, T. Wienold, X. Z. Zhu, A. Billmeier, Peter Levai, J. Zimányi, Christina Markert, G. Odyniec, I. Huang, A. Mock, D. J. Prindle, Torsten Henkel, J. Grebieszkow, B. Lasiuk, P. Freund, Marek Kowalski, H. Rudolph, E. Gladysz, P. Seyboth, J. Bartke, J. W. Harris, H. G. Ritter, V. I. Kolesnikov, P. Jacobs, V. Eckardt, T. A. Yates, F. P. Brady, D. Vranic, R. A. Barton, Fuqiang Wang, L. A. Hill, G. E. Cooper, M. Toy, D. Flierl, J. G. Cramer, E. Skrzypczak, I. Szentpetery, Marek Gaździcki, Zoltan Fodor, F. Pühlhofer, J. M. Nelson, Dieter Røhrich, Jozsef Molnar, R. Bock, G.T.A. Squier, K. Kadija, Predrag Buncic, F. Gabler, Gergely Palla, P. Csato, and R. Stock

Subjects
Physics, Nuclear reaction, Proton, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, Super Proton Synchrotron, Nuclear physics, Baryon, Rapidity, Atomic physics, Nuclear Experiment, Nucleon
Abstract

Net proton and negative hadron spectra for central Pb+Pb collisions at 158thinspthinspGeV per nucleon at the CERN Super Proton Synchrotron were measured and compared to spectra from lighter systems. Net baryon distributions were derived from those of net protons. Stopping (rapidity shift with respect to the beam) and mean transverse momentum {l_angle}p{sub T}{r_angle} of net baryons increase with system size. The rapidity density of negative hadrons scales with the number of participant nucleons for nuclear collisions, whereas their {l_angle}p{sub T}{r_angle} is independent of system size. The {l_angle}p{sub T}{r_angle} dependence upon particle mass and system size is consistent with larger transverse flow velocity at midrapidity for Pb+Pb compared to S+S central collisions. {copyright} {ital 1999} {ital The American Physical Society}

Published
1999
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5. Ξ and production in 158 GeV/nucleon Pb+Pb collisions

Author

H. Appelshäuser, J. Bächler, S.J. Bailey, D. Barna, L.S. Barnby, J. Bartke, R.A. Barton, H. Białkowska, A. Billmeier, C.O. Blyth, R. Bock, C. Bormann, F.P. Brady, R. Brockmann, R. Brun, P. Bunčić, H.L. Caines, L.D. Carr, D. Cebra, G.E. Cooper, J.G. Cramer, M. Cristinziani, P. Csato, J. Dunn, V. Eckardt, F. Eckhardt, M.I. Ferguson, H.G. Fischer, D. Flierl, Z. Fodor, P. Foka, P. Freund, V. Friese, M. Fuchs, F. Gabler, R. Ganz, W. Geist, J. Gal, M. Gaździcki, E. Gładysz, J. Grebieszkow, J. Günther, J.W. Harris, S. Hegyi, T. Henkel, L.A. Hill, H. Hümmler, G. Igo, D. Irmscher, P. Jacobs, P.G. Jones, K. Kadija, V.I. Kolesnikov, A. Konashenok, M. Kowalski, B. Lasiuk, P. Lévai, F. Liu, A.I. Malakhov, S. Margetis, C. Markert, G.L. Melkumov, A. Mock, J. Molnár, J.M. Nelson, M. Oldenburg, G. Odyniec, G. Palla, A.D. Panagiotou, A. Petridis, A. Piper, R.J. Porter, A.M. Poskanzer, D.J. Prindle, F. Pühlhofer, W. Rauch, J.G. Reid, R. Renfordt, W. Retyk, H.G. Ritter, D. Röhrich, C. Roland, G. Roland, H. Rudolph, A. Rybicki, A. Sandoval, H. Sann, A.Yu. Semenov, E. Schäfer, D. Schmischke, N. Schmitz, S. Schönfelder, P. Seyboth, J. Seyerlein, F. Sikler, E. Skrzypczak, R. Snellings, G.T.A. Squier, R. Stock, H. Ströbele, Chr. Struck, T. Susa, I. Szentpetery, J. Sziklai, M. Toy, T.A. Trainor, S. Trentalange, T. Ullrich, M. Vassiliou, G. Veres, G. Vesztergombi, D. Vranić, F. Wang, D.D. Weerasundara, S. Wenig, C. Whitten, T. Wienold, L. Wood, N. Xu, T.A. Yates, J. Zimanyi, X.-Z. Zhu, and R. Zybert

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Yield (chemistry), Hadron, Hyperon, Transverse mass, Rapidity, Nucleon, Spectral line, Bar (unit)
Abstract

We report measurements of Xi and Xi-bar hyperon absolute yields as a function of rapidity in 158 GeV/c Pb+Pb collisions. At midrapidity, dN/dy = 2.29 +/- 0.12 for Xi, and 0.52 +/- 0.05 for Xi-bar, leading to the ratio of Xi-bar/Xi = 0.23 +/- 0.03. Inverse slope parameters fitted to the measured transverse mass spectra are of the order of 300 MeV near mid-rapidity. The estimated total yield of Xi particles in Pb+Pb central interactions amounts to 7.4 +/- 1.0 per collision. Comparison to Xi production in properly scaled p+p reactions at the same energy reveals a dramatic enhancement (about one order of magnitude) of Xi production in Pb+Pb central collisions over elementary hadron interactions.

Published
1998
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6. Directed and elliptic flow in 158 GeV/nucleon Pb + Pb collisions

Author

J. W. Harris, Jozsef Molnar, F. P. Brady, V. Eckardt, K. Kadija, D. Flierl, D. D. Weerasundara, G.T.A. Squier, M. I. Ferguson, A. Sandoval, D. Irmscher, Siegfried Wenig, D. Schmischke, C. O. Blyth, S. Hegyi, M. Fuchs, C. Bormann, R. J. Porter, S. Margetis, H. G. Fischer, Andrzej Rybicki, H. Appelshäuser, R. A. Barton, J. G. Cramer, S. Schönfelder, Gyorgy Vesztergombi, Helena Bialkowska, D. J. Prindle, Dieter Røhrich, Rene Brun, H. G. Ritter, Marek Gaździcki, Christof Roland, A. Piper, T. Wienold, R. Zybert, S. Voloshin, G.E. Cooper, Rainer Arno Ernst Renfordt, E. Skrzypczak, Marek Kowalski, G. Pálla, Peter Levai, M. Toy, Andreas Petridis, I. Huang, L. Wood, Panagiota Foka, E. Gladysz, F. Eckhardt, P. Freund, J. Sziklai, Ferenc Sikler, F. Pühlhofer, G. L. Melkumov, G. Odyniec, J. Grebieszkow, J. Bächler, M. Vassiliou, V. I. Kolesnikov, G. Igo, M. Oldenburg, E. Schäfer, J. M. Nelson, A. Yu. Semenov, R. Brockmann, P. Csato, R. Stock, J. Seyerlein, Norbert Schmitz, Peter Martin Jacobs, T. A. Yates, D. Vranic, Predrag Buncic, Gunther Roland, P. Seyboth, F. Gabler, H. Rudolph, T. Ullrich, I. Szentpetery, Alexander Malakhov, L. A. Hill, D. Cebra, J. Günther, Peter Graham Jones, S. Trentalange, Apostolos Panagiotou, C. A. Whitten, J. Dunn, Christina Markert, V. Friese, Thomas A. Trainor, S. Poziombka, J. Zimányi, A. Mock, Torsten Henkel, B. Lasiuk, Z. Fodor, H. Hümmler, Jeffrey G. Reid, W. Retyk, W. Rauch, H. Sann, J. Bartke, J. Gál, H. Ströbele, R. K. Bock, Fuqiang Wang, A. M. Poskanzer, Lee Stuart Barnby, H. Caines, and S. J. Bailey

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, Elliptic flow, Physics::Fluid Dynamics, Nuclear physics, Pion, Flow (mathematics), Transverse momentum, Rapidity, Nuclear Experiment, Nucleon, Beam (structure)
Abstract

The directed and elliptic flow of protons and charged pions has been observed from the semi-central collisions of a 158 GeV/nucleon Pb beam with a Pb target. The rapidity and transverse momentum dependence of the flow has been measured. The directed flow of the pions is opposite to that of the protons at high rapidity but both exhibit negative flow at low p t . The elliptic flow of both is fairly independent of rapidity but rises with p t .

Published
1998
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7. Stopping and collective effects at SPS energies

Author

J. Dunn, Christina Markert, Siegfried Wenig, M. A. Howe, S. Poziombka, Serguei Afanasiev, F. Pühlhofer, J. Zimányi, J. G. Cramer, J. Sziklai, C. A. Whitten, C. O. Blyth, M. I. Ferguson, J. M. Nelson, A. M. Poskanzer, T. Alber, Lee Stuart Barnby, F. P. Brady, W. Rauch, S. Schönfelder, Gyorgy Vesztergombi, Andreas Petridis, D. Prindle, Norbert Schmitz, L. A. Hill, C. Bormann, Helena Bialkowska, G. L. Melkumov, M. Vassiliou, Marek Kowalski, R. Zybert, S. Margetis, Peter Martin Jacobs, H. Sann, Marek Gaździcki, R. Brockmann, E. Gladysz, Predrag Buncic, Peter Graham Jones, G. Odyniec, E. Schäfer, Jozsef Molnar, D. Irmscher, R. Bock, J. W. Mitchell, P. Seyboth, A. Yu. Semenov, S. Euler, J. Bartke, M. Toy, T. A. Yates, D. Vranic, F. Eckhardt, M. Cyprian, Gunther Roland, J. Grebieszkow, Christof Roland, P. Chan, J. W. Harris, H. Rudolph, H. G. Ritter, E. Skrzypczak, P. B. Cramer, N. Buncic, Rainer Arno Ernst Renfordt, J. Seyerlein, Peter Levai, A. Piper, H. Ströbele, G. Igo, J. Gál, D. Cebra, J. Günther, V. Eckardt, S. Trentalange, Apostolos Panagiotou, T. A. Trainor, I. Szentpetery, I. Huang, Ferenc Sikler, P. Freund, L. Wood, D. D. Weerasundara, D. Schmischke, D. Flierl, H. G. Fischer, Dieter Røhrich, H. Appelshäuser, G.E. Cooper, G. Pálla, X. Z. Zhu, K. Kadija, A. Sandoval, S. Hegyi, M. Fuchs, J. Bächler, V. I. Kolesnikov, H. L. Caines, Andrzej Rybicki, T. Wienold, P. Csato, R. Stock, Panagiota Foka, O. Dietz, F. Gabler, B. Lasiuk, I. Derado, A. Mock, Z. Fodor, H. Hümmler, W. Retyk, and Alexander Malakhov

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Proton, Spectrometer, Nuclear Theory, Collision, Projection (linear algebra), Nuclear physics, Time of flight, Energy flow, Rapidity, Nuclear Experiment, Nucleon
Abstract

We discuss preliminary data on stopping for central Pb + Pb collisions at 158 GeV/nucleon. The (net) proton rapidity density measured by the NA49 Time Projection Chambers, NA49 Time of Flight and the NA44 spectrometer is presented. Slightly higher stopping is observed relative to S + S at 200 GeV/nucleon. The rapidity density exhibits a plateau around mid-rapidity which is qualitatively different from results at the AGS and BEVALAC/SIS energies. The second part of the paper discusses the azimuthal correlation of the energy flow. Preliminary results reveal that the ‘fireball’ preserves the information of the collision geometry even at SPS energies.

Published
1996
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8. Analysis of the rapidity gap probability at CERN collider energies

Author

S Hegyi

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Negative binomial distribution, Elementary particle, Hadronization, law.invention, Nuclear physics, law, Supercluster, Rapidity, Collider, Scaling
Abstract

The rapidity gap probability, i.e., the probability of detecting no particles in a given rapidity interval is investigated in proton-antiproton collisions at CERN collider energies. A scaling behaviour is found in the central rapidity domain, similar to the scaling of the void probability in the Perseus-Pisces supercluster region of galaxies. This observation confirms that the recently proposed linked-pair approximation for the N-particle cumulant correlation functions holds valid to high order with linking coefficients slightly smaller than the negative binomial values. In the outer region of rapidity deviations are found from the scaling law which possibly is caused by the violation of translation invariance of the correlation functions. The correspondence to the clan production picture of hadronization is outlined: it is shown that the clan-model parameters can be obtained directly from the “hole probability”.

Published
1992
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9. System-size dependence ofΛandΞproduction in nucleus-nucleus collisions at40Aand158AGeV measured at the CERN Super Proton Synchrotron

Author

T. Anticic, B. Baatar, D. Barna, J. Bartke, H. Beck, L. Betev, H. Białkowska, C. Blume, B. Boimska, J. Book, M. Botje, J. Bracinik, P. Bunčić, V. Cerny, P. Christakoglou, P. Chung, O. Chvala, J. G. Cramer, P. Csató, P. Dinkelaker, V. Eckardt, Z. Fodor, P. Foka, V. Friese, J. Gál, M. Gaździcki, V. Genchev, K. Grebieszkow, S. Hegyi, C. Höhne, K. Kadija, A. Karev, D. Kresan, V. I. Kolesnikov, M. Kowalski, I. Kraus, M. Kreps, A. Laszlo, R. Lacey, M. van Leeuwen, P. Lévai, L. Litov, B. Lungwitz, M. Makariev, A. I. Malakhov, M. Mateev, G. L. Melkumov, C. Meurer, A. Mischke, M. Mitrovski, J. Molnár, St. Mrówczyński, V. Nicolic, G. Pálla, A. D. Panagiotou, D. Panayotov, A. Petridis, W. Peryt, M. Pikna, J. Pluta, D. Prindle, F. Pühlhofer, R. Renfordt, C. Roland, G. Roland, M. Rybczyński, A. Rybicki, A. Sandoval, N. Schmitz, T. Schuster, P. Seyboth, F. Siklér, B. Sitar, E. Skrzypczak, M. Slodkowski, G. Stefanek, R. Stock, C. Strabel, H. Ströbele, T. Susa, I. Szentpétery, J. Sziklai, M. Szuba, P. Szymanski, M. Utvić, D. Varga, M. Vassiliou, G. I. Veres, G. Vesztergombi, D. Vranić, Z. Włodarczyk, A. Wojtaszek, and I. K. Yoo

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, Elementary particle, Lambda baryon, 7. Clean energy, 01 natural sciences, Super Proton Synchrotron, Xi baryon, Nuclear physics, 0103 physical sciences, Transverse mass, Rapidity, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

Results on Λ, Λ , and Ξ- production in centrality selected Pb+Pb reactions at 40A and 158A GeV and in near-central C+C and Si+Si reactions at 158A GeV are presented. Transverse mass spectra, rapidity spectra, and multiplicities in dependence of the system size are discussed. Comparisons to transport models (ultrarelativistic quantum molecular dynamics and hadron string dynamics) and to the core-corona approach are performed. Although Λ and Λ production can be described by transport models reasonably well, these models do not agree with the Ξ- measurements. However, the core-corona picture fits very well the system-size dependence of Λ and Ξ-, whereas it agrees less well with the Λ data.

Published
2009
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10. Energy dependence of transverse momentum fluctuations inPb+Pbcollisions at the CERN Super Proton Synchrotron (SPS) at20Ato158AGeV

Author

T. Anticic, B. Baatar, D. Barna, J. Bartke, L. Betev, H. Białkowska, C. Blume, B. Boimska, M. Botje, J. Bracinik, P. Bunčić, V. Cerny, P. Christakoglou, P. Chung, O. Chvala, J. G. Cramer, P. Csató, P. Dinkelaker, V. Eckardt, Z. Fodor, P. Foka, V. Friese, J. Gál, M. Gaździcki, V. Genchev, E. Gładysz, K. Grebieszkow, S. Hegyi, C. Höhne, K. Kadija, A. Karev, D. Kikola, V. I. Kolesnikov, E. Kornas, R. Korus, M. Kowalski, M. Kreps, A. Laszlo, R. Lacey, M. van Leeuwen, P. Lévai, L. Litov, B. Lungwitz, M. Makariev, A. I. Malakhov, M. Mateev, G. L. Melkumov, A. Mischke, M. Mitrovski, J. Molnár, St. Mrówczyński, V. Nicolic, G. Pálla, A. D. Panagiotou, D. Panayotov, A. Petridis, W. Peryt, M. Pikna, J. Pluta, D. Prindle, F. Pühlhofer, R. Renfordt, C. Roland, G. Roland, M. Rybczyński, A. Rybicki, A. Sandoval, N. Schmitz, T. Schuster, P. Seyboth, F. Siklér, B. Sitar, E. Skrzypczak, M. Slodkowski, G. Stefanek, R. Stock, C. Strabel, H. Ströbele, T. Susa, I. Szentpétery, J. Sziklai, M. Szuba, P. Szymanski, V. Trubnikov, M. Utvic, D. Varga, M. Vassiliou, G. I. Veres, G. Vesztergombi, D. Vranić, Z. Włodarczyk, A. Wojtaszek, and I. K. Yoo

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, 01 natural sciences, Super Proton Synchrotron, Charged particle, Nuclear physics, Baryon, Critical point (thermodynamics), 0103 physical sciences, Rapidity, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics, Nucleon
Abstract

Results are presented on event-by-event fluctuations of transverse momenta p{sub T} in central Pb+Pb interactions at 20A, 30A, 40A, 80A, and 158A GeV. The analysis was performed for charged particles at forward center-of-mass rapidity (1.1

Published
2009
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11. Energy dependence of Λ and Ξ production in centralPb+Pbcollisions at20A,30A,40A,80A, and 158AGeV measured at the CERN Super Proton Synchrotron

Author

M. Makariev, M. K. Mitrovski, Katarzyna Grebieszkow, V. Friese, D. J. Prindle, B. Baatar, J. Pluta, Andreas Petridis, Alexander Malakhov, M. van Leeuwen, Marek Kowalski, M. Słodkowski, Gyorgy Vesztergombi, H. Ströbele, Christof Roland, D. Barna, Zbigniew Wlodarczyk, Mrowczynski, E. Gladysz, P. Dinkelaker, Michal Kreps, A. Richard, M. Szuba, M. Botje, Miroslav Pikna, Jozsef Molnar, R. Lacey, I. Kraus, P. Christakoglou, J. Zimányi, Andre Mischke, A. Wetzler, P. Csato, J. Gál, P. Chung, E. Kornas, C. Meurer, J. Sziklai, R. Stock, Gunther Roland, R. Bramm, Apostolos Panagiotou, O. Chvala, M. Utvić, B. Lungwitz, P. Seyboth, Predrag Buncic, G. L. Melkumov, D. Panayotov, D. Flierl, P. Szymanski, A. Karev, Bożena Boimska, Peter Levai, Branislav Sitar, Z. Fodor, F. Pühlhofer, J. Bracinik, T. R. Schuster, C. Strabel, Panagiota Foka, Helena Bialkowska, T. Susa, V. Eckardt, Leander Litov, Kreso Kadija, I. K. Yoo, V. Cerny, J. Bartke, V. Trubnikov, W. Peryt, Gabor Istvan Veres, V. Genchev, C. Alt, G. Stefanek, Andras Laszlo, A. Sandoval, M. Mateev, M. Vassiliou, V. Nicolic, C. Höhne, Christoph Blume, E. Skrzypczak, Andrzej Rybicki, G. Pálla, Rainer Arno Ernst Renfordt, M. Kliemant, Dezso Varga, N. Schmitz, M. Gazdzicki, A. Wojtaszek, Ferenc Sikler, S. Hegyi, Latchezar Betev, D. P. Kikola, I. Szentpetery, J. G. Cramer, Maciej Rybczyński, T. Antičić, S. Kniege, V. I. Kolesnikov, and D. Vranic

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Elementary particle, Lambda baryon, 7. Clean energy, 01 natural sciences, Super Proton Synchrotron, Xi baryon, Nuclear physics, Baryon, 0103 physical sciences, Transverse mass, Rapidity, Nuclear Experiment, 010306 general physics
Abstract

Results on {lambda},{lambda},{xi}{sup -}, and {xi}{sup +} production in central Pb+Pb reactions at 20A,30A,40A,80A, and 158A GeV are presented. The energy dependence of transverse mass spectra, rapidity spectra, and multiplicities is discussed. Comparisons to string hadronic models (UrQMD and HSD) and statistical hadron gas models are shown. Although the latter provide a reasonable description of all particle yields, the first class of models fails to match the {xi}{sup -} and {xi}{sup +} multiplicities.

Published
2008
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12. Energy dependence of multiplicity fluctuations in heavy ion collisions at20Ato158AGeV

Author

C. Alt, T. Anticic, B. Baatar, D. Barna, J. Bartke, L. Betev, H. Białkowska, C. Blume, B. Boimska, M. Botje, J. Bracinik, R. Bramm, P. Bunčić, V. Cerny, P. Christakoglou, P. Chung, O. Chvala, J. G. Cramer, P. Csató, P. Dinkelaker, V. Eckardt, D. Flierl, Z. Fodor, P. Foka, V. Friese, J. Gál, M. Gaździcki, V. Genchev, G. Georgopoulos, E. Gładysz, K. Grebieszkow, S. Hegyi, C. Höhne, K. Kadija, A. Karev, D. Kikola, M. Kliemant, S. Kniege, V. I. Kolesnikov, E. Kornas, R. Korus, M. Kowalski, I. Kraus, M. Kreps, A. Laszlo, R. Lacey, M. van Leeuwen, P. Lévai, L. Litov, B. Lungwitz, M. Makariev, A. I. Malakhov, M. Mateev, G. L. Melkumov, A. Mischke, M. Mitrovski, J. Molnár, St. Mrówczyński, V. Nicolic, G. Pálla, A. D. Panagiotou, D. Panayotov, A. Petridis, W. Peryt, M. Pikna, J. Pluta, D. Prindle, F. Pühlhofer, R. Renfordt, C. Roland, G. Roland, M. Rybczyński, A. Rybicki, A. Sandoval, N. Schmitz, T. Schuster, P. Seyboth, F. Siklér, B. Sitar, E. Skrzypczak, M. Slodkowski, G. Stefanek, R. Stock, C. Strabel, H. Ströbele, T. Susa, I. Szentpétery, J. Sziklai, M. Szuba, P. Szymanski, V. Trubnikov, M. Utvic, D. Varga, M. Vassiliou, G. I. Veres, G. Vesztergombi, D. Vranić, A. Wetzler, Z. Włodarczyk, A. Wojtaszek, I. K. Yoo, and J. Zimányi

Subjects
Physics, Nuclear and High Energy Physics, Conservation law, 010308 nuclear & particles physics, Hadron, Elementary particle, 01 natural sciences, Charged particle, Nuclear physics, Critical point (thermodynamics), 0103 physical sciences, Quark–gluon plasma, Rapidity, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics
Abstract

Multiplicity fluctuations of positively, negatively, and all charged hadrons in the forward hemisphere were studied in central Pb+Pb collisions at 20A, 30A, 40A, 80A, and 158A GeV. The multiplicity distributions and their scaled variances ω are presented as functions of their dependence on collision energy as well as on rapidity and transverse momentum. The distributions have bell-like shapes and their scaled variances are in the range from 0.8 to 1.2 without any significant structure in their energy dependence. No indication of the critical point in fluctuations are observed. The string-hadronic ultrarelativistic quantum molecular dynamics (UrQMD) model significantly overpredicts the mean, but it approximately reproduces the scaled variance of the multiplicity distributions. The predictions of the statistical hadron-resonance gas model obtained within the grand-canonical and canonical ensembles disagree with the measured scaled variances. The narrower than Poissonian multiplicity fluctuations measured in numerous cases may be explained by the impact of conservation laws on fluctuations in relativistic systems.

Published
2008
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13. Bose-Einstein correlations ofπ−π−pairs in central Pb+Pb collisions at20A,30A,40A,80A, and158AGeV

Author

C. Alt, T. Anticic, B. Baatar, D. Barna, J. Bartke, L. Betev, H. Białkowska, C. Blume, B. Boimska, M. Botje, J. Bracinik, R. Bramm, P. Bunčić, V. Cerny, P. Christakoglou, P. Chung, O. Chvala, J. G. Cramer, P. Csató, P. Dinkelaker, V. Eckardt, D. Flierl, Z. Fodor, P. Foka, V. Friese, J. Gál, M. Gaździcki, V. Genchev, G. Georgopoulos, E. Gładysz, K. Grebieszkow, S. Hegyi, C. Höhne, K. Kadija, A. Karev, D. Kikola, M. Kliemant, S. Kniege, V. I. Kolesnikov, E. Kornas, R. Korus, M. Kowalski, I. Kraus, M. Kreps, A. Laszlo, R. Lacey, M. van Leeuwen, P. Lévai, L. Litov, B. Lungwitz, M. Makariev, A. I. Malakhov, M. Mateev, G. L. Melkumov, A. Mischke, M. Mitrovski, J. Molnár, St. Mrówczyński, V. Nicolic, G. Pálla, A. D. Panagiotou, D. Panayotov, A. Petridis, W. Peryt, M. Pikna, J. Pluta, D. Prindle, F. Pühlhofer, R. Renfordt, C. Roland, G. Roland, M. Rybczyński, A. Rybicki, A. Sandoval, N. Schmitz, T. Schuster, P. Seyboth, F. Siklér, B. Sitar, E. Skrzypczak, M. Slodkowski, G. Stefanek, R. Stock, C. Strabel, H. Ströbele, T. Susa, I. Szentpétery, J. Sziklai, M. Szuba, P. Szymanski, V. Trubnikov, D. Varga, M. Vassiliou, G. I. Veres, G. Vesztergombi, D. Vranić, A. Wetzler, Z. Włodarczyk, A. Wojtaszek, I. K. Yoo, and J. Zimányi

Subjects
Physics, Nuclear and High Energy Physics, Meson, Proton, 010308 nuclear & particles physics, Hadron, Radius, Bose–Einstein correlations, 01 natural sciences, Nuclear physics, Pion, 0103 physical sciences, Rapidity, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

Measurements of Bose-Einstein correlations of {pi}{sup -}{pi}{sup -} pairs in central Pb+Pb collisions were performed with the NA49 detector at the CERN Super Proton Synchroton for beam energies of 20A,30A,40A,80A, and 158A GeV. Correlation functions were measured in the longitudinally comoving 'out-side-long' reference frame as a function of rapidity and transverse momentum in the forward hemisphere of the reaction. Radius and correlation strength parameters were obtained from fits of a Gaussian parametrization. The results show a decrease of the radius parameters with increasing transverse-momentum characteristic of strong radial flow in the pion source. No striking dependence on pion-pair rapidity or beam energy is observed. Static and dynamic properties of the pion source are obtained from simultaneous fits with a blast-wave model to radius parameters and midrapidity transverse-momentum spectra. Predictions of hydrodynamic and microscopic models of Pb+Pb collisions are discussed.

Published
2008
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14. Rapidity and energy dependence of the electric charge correlations inA+Acollisions from20Ato158AGeV

Author

C. Alt, T. Anticic, B. Baatar, D. Barna, J. Bartke, L. Betev, H. Białkowska, C. Blume, B. Boimska, M. Botje, J. Bracinik, R. Bramm, P. Bunčić, V. Cerny, P. Christakoglou, P. Chung, O. Chvala, J. G. Cramer, P. Csató, P. Dinkelaker, V. Eckardt, D. Flierl, Z. Fodor, P. Foka, V. Friese, J. Gál, M. Gaździcki, V. Genchev, G. Georgopoulos, E. Gładysz, K. Grebieszkow, S. Hegyi, C. Höhne, K. Kadija, A. Karev, D. Kikola, M. Kliemant, S. Kniege, V. I. Kolesnikov, E. Kornas, R. Korus, M. Kowalski, I. Kraus, M. Kreps, A. Laszlo, R. Lacey, M. van Leeuwen, P. Lévai, L. Litov, B. Lungwitz, M. Makariev, A. I. Malakhov, M. Mateev, G. L. Melkumov, A. Mischke, M. Mitrovski, J. Molnár, St. Mrówczyński, V. Nicolic, G. Pálla, A. D. Panagiotou, D. Panayotov, A. Petridis, W. Peryt, M. Pikna, J. Pluta, D. Prindle, F. Pühlhofer, R. Renfordt, C. Roland, G. Roland, M. Rybczyński, A. Rybicki, A. Sandoval, N. Schmitz, T. Schuster, P. Seyboth, F. Siklér, B. Sitar, E. Skrzypczak, M. Slodkowski, G. Stefanek, R. Stock, C. Strabel, H. Ströbele, T. Susa, I. Szentpétery, J. Sziklai, M. Szuba, P. Szymanski, V. Trubnikov, D. Varga, M. Vassiliou, G. I. Veres, G. Vesztergombi, D. Vranić, A. Wetzler, Z. Włodarczyk, A. Wojtaszek, I. K. Yoo, and J. Zimányi

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Jet (particle physics), 01 natural sciences, Electric charge, Super Proton Synchrotron, Hadronization, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, Nucleon, Relativistic Heavy Ion Collider
Abstract

Results from electric charge correlations studied with the Balance Function (BF) method in A+A collisions from 20A to 158A GeV are presented in two different rapidity intervals: In the midrapidity region we observe a decrease of the width of the BF distribution with increasing centrality of the collision, whereas this effect vanishes in the forward rapidity region. Results from the energy dependence study in central Pb+Pb collisions show that the narrowing of the BF expressed by the normalized width parameter W increases with energy toward the highest CERN Super Proton Synchrotron and BNL Relativistic Heavy Ion Collider energies. Finally we compare our experimental data points with the predictions of several models. The hadronic string models Ultra-relativistic Quantum Molecular Dynamics and Heavy Ion Jet INteraction Generator (HIJING) do not reproduce the observed narrowing of the BF. However, A MultiPhase Transport medel (AMPT), which contains a quark-parton transport phase before hadronization, can reproduce the narrowing of the BF's width with centrality. This confirms the proposed sensitivity of the BF analysis to the time of hadronization.

Published
2007
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15. Energy and centrality dependence ofp¯andpproduction and theΛ¯/p¯ratio in Pb+Pb collisions between 20AGeV and 158AGeV

Author

C. Alt, T. Anticic, B. Baatar, D. Barna, J. Bartke, L. Betev, H. Białkowska, C. Blume, B. Boimska, M. Botje, J. Bracinik, R. Bramm, P. Buncić, V. Cerny, P. Christakoglou, O. Chvala, J. G. Cramer, P. Csató, P. Dinkelaker, V. Eckardt, D. Flierl, Z. Fodor, P. Foka, V. Friese, J. Gál, M. Gaździcki, V. Genchev, G. Georgopoulos, E. Gładysz, K. Grebieszkow, S. Hegyi, C. Höhne, K. Kadija, A. Karev, M. Kliemant, S. Kniege, V. I. Kolesnikov, E. Kornas, R. Korus, M. Kowalski, I. Kraus, M. Kreps, A. Laslo, M. van Leeuwen, P. Lévai, L. Litov, B. Lungwitz, M. Makariev, A. I. Malakhov, M. Mateev, G. L. Melkumov, A. Mischke, M. Mitrovski, J. Molnár, St. Mrówczyński, V. Nicolic, G. Pálla, A. D. Panagiotou, D. Panayotov, A. Petridis, M. Pikna, D. Prindle, F. Pühlhofer, R. Renfordt, C. Roland, G. Roland, M. Rybczyński, A. Rybicki, A. Sandoval, N. Schmitz, T. Schuster, P. Seyboth, F. Siklér, B. Sitar, E. Skrzypczak, G. Stefanek, R. Stock, C. Strabel, H. Ströbele, T. Susa, I. Szentpétery, J. Sziklai, P. Szymanski, V. Trubnikov, D. Varga, M. Vassiliou, G. I. Veres, G. Vesztergombi, D. Vranić, A. Wetzler, Z. Włodarczyk, I. K. Yoo, and J. Zimányi

Subjects
Nuclear reaction, Physics, Nuclear physics, Nuclear and High Energy Physics, Proton, Antiproton, Antimatter, Hadron, Transverse mass, Rapidity, Atomic physics, Nuclear Experiment, Lambda baryon
Abstract

The transverse mass m{sub t} distributions for antiprotons are measured at midrapidity for minimum bias Pb+Pb collisions at 158A GeV and for central Pb+Pb collisions at 20A, 30A, 40A, and 80A GeV beam energies in the fixed target experiment NA49 at the CERN SPS. The rapidity density dn/dy, inverse slope parameter T, and mean transverse mass derived from the m{sub t} distributions are studied as a function of the incident energy and the collision centrality and compared to the relevant data on proton production. The shapes of the m{sub t} distributions of p and p are very similar. The ratios of the particle yields, p/p and {lambda}/p, are also analyzed. The p/p ratio exhibits an increase with decreasing centrality and a steep rise with increasing beam energy. The {lambda}/p ratio increases beyond unity with decreasing beam energy.

Published
2006
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16. Elliptic flow of Lambda hyperons in Pb+Pb collisions at 158A GeV

Author

C. Alt, T. Anticic, B. Baatar, D. Barna, J. Bartke, L. Betev, H. Białkowska, C. Blume, B. Boimska, M. Botje, J. Bracinik, R. Bramm, P. Bunčić, V. Cerny, P. Christakoglou, P. Chung, O. Chvala, J. G. Cramer, P. Csató, P. Dinkelaker, V. Eckardt, D. Flierl, Z. Fodor, P. Foka, V. Friese, J. Gál, M. Gaździcki, G. Georgopoulos, E. Gładysz, K. Grebieszkow, S. Hegyi, C. Höhne, K. Kadija, A. Karev, M. Kliemant, S. Kniege, V. I. Kolesnikov, E. Kornas, R. Korus, M. Kowalski, I. Kraus, M. Kreps, R. Lacey, A. Laszlo, M. van Leeuwen, P. Lévai, L. Litov, B. Lungwitz, M. Makariev, A. I. Malakhov, M. Mateev, G. L. Melkumov, A. Mischke, M. Mitrovski, J. Molnár, St. Mrówczyński, V. Nicolic, G. Pálla, A. D. Panagiotou, D. Panayotov, A. Petridis, M. Pikna, D. Prindle, F. Pühlhofer, R. Renfordt, C. Roland, G. Roland, M. Rybczyński, A. Rybicki, A. Sandoval, N. Schmitz, T. Schuster, P. Seyboth, F. Siklér, B. Sitar, E. Skrzypczak, G. Stefanek, R. Stock, C. Strabel, H. Ströbele, T. Susa, I. Szentpétery, J. Sziklai, P. Szymanski, V. Trubnikov, D. Varga, M. Vassiliou, G. I. Veres, G. Vesztergombi, D. Vranić, A. Wetzler, Z. Włodarczyk, A. Wojtaszek, I. K. Yoo, and J. Zimányi

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Elliptic flow, Hadron, Nuclear Theory, FOS: Physical sciences, Elementary particle, 01 natural sciences, Nuclear physics, Baryon, QGP, SPS, Lambda, elliptic flow, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Physics - Experiment, Rapidity, Impact parameter, Nuclear Experiment (nucl-ex), 010306 general physics, Nucleon, Nuclear Experiment
Abstract

The elliptic flow of Lambda hyperons has been measured by the NA49 collaboration at the CERN-SPS in semi-central Pb+Pb collisions at 158A GeV. The standard method of correlating particles with the event plane was used. Measurements of v2 near mid-rapidity are reported as a function of rapidity, centrality and transverse momentum. Elliptic flow of Lambda particles increases both with the impact parameter and with the transverse momentum. It is compared with v2 for pions and protons as well as with model calculations. The observation of significant elliptic flow and its mass dependence suggest strong collective behaviour of the matter produced in collisions of heavy nuclei already at the SPS. Scaling properties of elliptic flow of different particle species have been tested at 158A GeV. The limited pT range of the data does not allow for a decisive test of the coalescence model., Comment: 6 pages, 6 figures, submitted to Physical Review C

Published
2006
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17. Centrality and system size dependence of multiplicity fluctuations in nuclear collisions at 158 AGeV

Author

C. Alt, T. Anticic, B. Baatar, D. Barna, J. Bartke, L. Betev, H. Białkowska, C. Blume, B. Boimska, M. Botje, J. Bracinik, R. Bramm, P. Bunčić, V. Cerny, P. Christakoglou, P. Chung, O. Chvala, J. G. Cramer, P. Csató, P. Dinkelaker, V. Eckardt, D. Flierl, Z. Fodor, P. Foka, V. Friese, J. G´l, M. Gaździcki, V. Genchev, G. Georgopoulos, E. Gładysz, K. Grebieszkow, S. Hegyi, C. Höhne, K. Kadija, A. Karev, D. Kikola, M. Kliemant, S. Kniege, V. I. Kolesnikov, E. Kornas, R. Korus, M. Kowalski, I. Kraus, M. Kreps, A. Laszlo, R. Lacey, M. van Leeuwen, P. Lévai, L. Litov, B. Lungwitz, M. Makariev, A. I. Malakhov, M. Mateev, G. L. Melkumov, A. Mischke, M. Mitrovski, J. Molnár, St. Mrówczyński, V. Nicolic, G. Pálla, A. D. Panagiotou, D. Panayotov, W. Peryt, A. Petridis, M. Pikna, J. Pluta, D. Prindle, F. Pühlhofer, R. Renfordt, C. Roland, G. Roland, M. Rybczyński, A. Rybicki, A. Sandoval, N. Schmitz, T. Schuster, P. Seyboth, F. Siklér, B. Sitar, E. Skrzypczak, M. Slodkowski, G. Stefanek, R. Stock, C. Strabel, H. Ströbele, T. Susa, I. Szentpétery, J. Sziklai, M. Szuba, P. Szymanski, V. Trubnikov, D. Varga, M. Vassiliou, G. I. Veres, G. Vesztergombi, D. Vranić, A. Wetzler, Z. Włodarczyk, A. Wojtaszek, I. K. Yoo, and J. Zimńyi

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Particle physics, NA49, CERN, SPS, QGP, fluctuations, multiplicity, 010308 nuclear & particles physics, Hadron, Quark model, FOS: Physical sciences, Multiplicity (mathematics), Elementary particle, 01 natural sciences, Charged particle, Nuclear physics, 0103 physical sciences, Rapidity, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Centrality, Nuclear Experiment
Abstract

The centrality and system size dependence of multiplicity fluctuations of charged particles produced in nuclear collisions at $158 A$ GeV was studied by the NA49 collaboration. Centrality selected Pb+Pb collisions, semi-central C+C and Si+Si collisions as well as inelastic p+p interactions were analyzed. The number of projectile participants determined on an event-by-event basis was used to characterize the collision centrality. The scaled variance of the multiplicity distribution obtained in the forward rapidity region ($1.1, Comment: 16 pages, 18 figures; some typos corrected; to appear in Phys. Rev. C

Published
2006
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18. Ω−andΩ¯+Production in CentralPb+Pbcollisions at 40 and158A GeV

Author

Tatjana Susa, P. Freund, Andre Mischke, M. K. Mitrovski, Lawrence Pinsky, J. Sziklai, Katarzyna Grebieszkow, Zbigniew Wlodarczyk, B. Lungwitz, A. Rybicki, B. Baatar, B. W. Mayes, V. Friese, V. Eckardt, G. Farantatos, M. Makariev, C. Meurer, Rainer Arno Ernst Renfordt, Helena Bialkowska, N. Darmenov, Marek Kowalski, G. Pálla, P. Seyboth, A. Billmeier, Christina Markert, E. Gladysz, P. Dinkelaker, A. Wetzler, Z. Fodor, V. I. Kolesnikov, M. Botje, J. Bracinik, Latchezar Betev, C. Höhne, Thomas A. Trainor, Kreso Kadija, M. Gadzicki, H. Ströbele, Ferenc Sikler, Dezso Varga, J. Gál, Michal Kreps, D. Barna, M. Vassiliou, Alexander Malakhov, D. Vranic, Gunther Roland, St Mrówczyński, Andreas Petridis, Tome Anticic, R. Korus, P. Christakoglou, Gyorgy Vesztergombi, E. Kornas, Christof Roland, Leander Litov, Jeffrey G. Reid, M. van Leeuwen, Apostolos Panagiotou, G. L. Melkumov, Anton Dimitrov, I. Kraus, G. Georgopoulos, Christoph Blume, Gabor Istvan Veres, H. Sann, O. Chvala, J. G. Cramer, Thorsten Sven Kollegger, I. K. Yoo, Rene Brun, D. Flierl, J. Bartke, G. Stefanek, D. Panayotov, A. Richard, Miroslav Pikna, S. Hegyi, C. Alt, E. Skrzypczak, Jozsef Molnar, N. Schmitz, R. Bramm, Predrag Buncic, A. Karev, F. Pühlhofer, V. Cerny, I. Szentpetery, S. Kniege, Maciej Rybczyński, A. Sandoval, M. Mateev, P. Csato, Bożena Boimska, Peter Levai, R. Stock, M. Kliemant, Branislav Sitar, and Panagiota Foka

Subjects
Physics, Nuclear reaction, Particle physics, Hadron, General Physics and Astronomy, Omega baryon, Omega, Sigma baryon, Baryon, Nuclear physics, Pair production, High Energy Physics::Experiment, Rapidity, Nuclear Experiment
Abstract

Results are presented on {omega} production in central Pb+Pb collisions at 40 and 158A GeV beam energy. For the first time in heavy ion reactions, rapidity distributions and total yields were measured for the sum {omega}{sup -}+{omega}{sup +} at 40A GeV and for {omega}{sup -} and {omega}{sup +} separately at 158A GeV. The yields are strongly underpredicted by the string-hadronic UrQMD model but agree better with predictions from hadron gas models.

Published
2005
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19. ΛandΛ¯Production in Central Pb-Pb Collisions at 40, 80, and158A GeV

Author

Miroslav Pikna, V. I. Kolesnikov, B. Baatar, Andre Mischke, D. Vranic, A. Wetzler, Andreas Petridis, E. Skrzypczak, N. Darmenov, H. Ströbele, M. Botje, Michal Kreps, S. Hegyi, A. Billmeier, M. Makariev, Dezso Varga, Christina Markert, K. Perl, Marek Kowalski, M. Vassiliou, Z. Fodor, J. Bracinik, Andrzej Rybicki, A. Karev, E. Gladysz, P. Dinkelaker, P. Seyboth, D. Barna, F. Pühlhofer, V. Eckardt, Leander Litov, G. Georgopoulos, Branislav Sitar, Rene Brun, P. Freund, B. W. Mayes, Gunther Roland, Kreso Kadija, Panagiota Foka, V. Cerny, Gabor Istvan Veres, T. Susa, H. Sann, Jozsef Molnar, J. Zaranek, W. Retyk, M. K. Mitrovski, I. K. Yoo, Gyorgy Vesztergombi, St Mrówczyński, T. A. Trainer, J. G. Cramer, J. Zimányi, C. Meurer, R. Korus, V. Friese, P. Christakoglou, Marek Gaździcki, L. S. Pinsky, E. Kornas, J. Gál, R. Bramm, Predrag Buncic, Christof Roland, Alexander Malakhov, G. Pálla, D. Panayotov, G. Stefanek, C. Höhne, I. Kraus, P. Csato, R. Stock, Zbigniew Wlodarczyk, N. Schmitz, L. Betev, I. Szentpetery, O. Chvala, Thorsten Sven Kollegger, Jeffrey G. Reid, D. Flierl, Maciej Rybczyński, T. Antičić, C. Blume, Anton Dimitrov, M. van Leeuwen, Rainer Arno Ernst Renfordt, Ferenc Sikler, M. Behler, A. Sandoval, M. Mateev, P. Filip, Bożena Boimska, Peter Levai, I. Bartke, Apostolos Panagiotou, G. L. Melkumov, J. Sziklai, and Helena Bialkowska

Subjects
Physics, Hadron, General Physics and Astronomy, Alternating Gradient Synchrotron, Lambda baryon, Lambda, Super Proton Synchrotron, Nuclear physics, Antimatter, Physics::Accelerator Physics, Transverse mass, High Energy Physics::Experiment, Rapidity, Atomic physics, Nuclear Experiment
Abstract

Production of Lambda and Antilambda 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.

Published
2004
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20. Energy and centrality dependence of deuteron and proton production inPb+Pbcollisions at relativistic energies

Author

R. Korus, P. Christakoglou, A. Wetzler, M. Behler, V. I. Kolesnikov, Apostolos Panagiotou, G. L. Melkumov, A. Sandoval, Thorsten Sven Kollegger, D. Vranic, Tatjana Susa, Gyorgy Vesztergombi, M. Vassiliou, G.E. Cooper, P. Freund, Marek Kowalski, Andreas Petridis, E. Gladysz, P. Dinkelaker, J. Sziklai, Andre Mischke, K. Perl, Tome Anticic, M. K. Mitrovski, Miroslav Pikna, M. van Leeuwen, C. Höhne, P. Filip, H. Sann, I. Kraus, Z. Fodor, Dezso Varga, N. Xu, Gunther Roland, M. Botje, Bożena Boimska, P. Seyboth, J. Bracinik, B. W. Mayes, Peter Levai, S. Hegyi, Rainer Arno Ernst Renfordt, Jozsef Molnar, St Mrówczyński, Michal Kreps, Kreso Kadija, Gabor Istvan Veres, D. Barna, J. G. Cramer, E. Skrzypczak, B. Baatar, G. Pálla, Christof Roland, W. Retyk, Marek Gaździcki, G. Stefanek, Ferenc Sikler, L. Betev, Rene Brun, I. K. Yoo, Helena Bialkowska, Alexander Malakhov, Thomas A. Trainor, O. Chvala, A. Rybicki, J. Gál, A. Billimeier, C. Blume, N. Schmitz, J. Zimányi, C. Meurer, H. G. Fischer, J. Bartke, Lawrence Pinsky, Christina Markert, J. Zaranek, Peter Martin Jacobs, R. Bramm, Szentpétery, Predrag Buncic, Jeffrey G. Reid, V. Eckardt, Zbigniew Wlodarczyk, A. Karev, Maciej Rybczyński, F. Pühlhofer, V. Cerny, V. Friese, G. Georgopoulos, Siegfried Wenig, H. Ströbele, P. Csato, R. Stock, Branislav Sitar, and Panagiota Foka

Subjects
Nuclear reaction, Physics, Coalescence (physics), Nuclear physics, Nuclear and High Energy Physics, Proton, Hadron, Transverse mass, Rapidity, Atomic physics, Nuclear Experiment, Nucleon, Charged particle
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
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21. Directed and elliptic flow of charged pions and protons inPb+Pbcollisions at40Aand158AGeV

Author

A. Wetzler, Thorsten Sven Kollegger, Lawrence Pinsky, Gyorgy Vesztergombi, M. Vassiliou, Phuong Mai Dinh, Tome Anticic, Michal Kreps, I. Kraus, P. Seyboth, A. Karev, Rainer Arno Ernst Renfordt, J. Y. Ollitrault, F. Pühlhofer, Jeffrey G. Reid, Andre Mischke, A. M. Poskanzer, V. Eckardt, Sergey Voloshin, Zbigniew Wlodarczyk, V. Cerny, Kreso Kadija, J. Zaranek, J. Gál, V. Friese, Gunther Roland, Helena Bialkowska, Marek Kowalski, Ferenc Sikler, G.E. Cooper, Tatjana Susa, Gergely Palla, Peter Martin Jacobs, Christof Roland, R. Bramm, Predrag Buncic, Thomas A. Trainor, St Mrówczyński, E. Gladysz, P. Dinkelaker, Andreas Petridis, L. Betev, P. Freund, G. Odyniec, Branislav Sitar, Panagiota Foka, K. Perl, M. van Leeuwen, Dezso Varga, M. K. Mitrovski, E. Skrzypczak, A. Rybicki, Nicolas Borghini, J. Zimányi, C. Meurer, O. Chvala, P. Csato, M. Botje, R. Stock, A. Billmeier, D. Barna, R. Korus, Christina Markert, Apostolos Panagiotou, C. Höhne, G. L. Melkumov, N. Schmitz, Jozsef Molnar, M. Rybczynśki, C. Alt, Miroslav Pikna, J. Sziklai, B. W. Mayes, V. I. Kolesnikov, D. Vranic, B. Baatar, J. G. Cramer, Marek Gaździcki, G. Stefanek, Christoph Blume, I. Szentpetery, S. Kniege, Rene Brun, Z. Fodor, J. Bracinik, Gabor Istvan Veres, G. Georgopoulos, S. Hegyi, R.J.M. Snellings, W. Retyk, H. Ströbele, M. Behler, H. Sann, A. Sandoval, P. Filip, I. K. Yoo, Alexander Malakhov, H. G. Ritter, Bożena Boimska, Peter Levai, and J. Bartke

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Pion, Flow (mathematics), Plane (geometry), Elliptic flow, Transverse momentum, Detector, Rapidity, Nuclear Experiment, Event (particle physics)
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
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22. Recent results on spectra and yields from NA49

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Hadron, FOS: Physical sciences, Strangeness, Lambda, Spectral line, Nuclear physics, Pion, Nuclear Physics - Experiment, High Energy Physics::Experiment, Rapidity, Production (computer science), Nuclear Experiment (nucl-ex), Nuclear Experiment, Bar (unit)
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., Comment: 10 pages, 9 figures, Presented at Quark Matter 2002, Nantes, France

Published
2003

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

Author

A Mischke for the NA49 Collaboration, S V Afanasiev, T Anticic, D Barna, J Bartke, R A Barton, L Betev, H Bia$lslash$kowska, A Billmeier, C Blume, C O Blyth, B Boimska, M Botje, J Bracinik, R Bramm, R Brun, P Bun$ccheck$i$cacute$, V Cerny, J G Cramer, P Csat$oacute$, P Dinkelaker, V Eckardt, P Filip, H G Fischer, Z Fodor, P Foka, P Freund, V Friese, J G$aacute$l, M Ga$zacute$dzicki, G Georgopoulos, E G$lslash$adysz, S Hegyi, C H$ouml$hne, G Igo, P G Jones, K Kadija, A Karev, V I Kolesnikov, T Kollegger, M Kowalski, I Kraus, M Kreps, P L$eacute$vai, A I Malakhov, S Margetis, C Markert, B W Mayes, G L Melkumov, A Mischke, J Moln$aacute$r, J M Nelson, G P$aacute$lla, A D Panagiotou, K Perl, A Petridis, M Pikna, L Pinsky, F P$uuml$hlhofer, J G Reid, R Renfordt, W Retyk, C Roland, G Roland, A Rybicki, T Sammer, A Sandoval, H Sann, N Schmitz, P Seyboth, F Sikl$eacute$r, B Sitar, E Skrzypczak, G T A Squier, R Stock, H Str$ouml$bele, T Susa, I Szentp$eacute$tery, J Sziklai, T A Trainor, D Varga, M Vassiliou, G I Veres, G Vesztergombi, D Vrani$cacute$, M van Leeuwen, S Wenig, A Wetzler, C Whitten, I K Yoo, J Zaranek, and J Zim$aacute$nyi

Subjects
Physics, Nuclear and High Energy Physics, Hyperon, FOS: Physical sciences, Lambda, Spectral line, Nuclear physics, Transverse mass, Nuclear Physics - Experiment, Production (computer science), Rapidity, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, NA49 experiment, Bar (unit)
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., Comment: SQM proceedings. J. Phys. G: Nucl. Part. Phys.: submitted

Published
2002
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24. Centrality Dependence of Directed and Elliptic Flow at the SPS

Author

A.M. Poskanzer, S.A. Voloshin, J. Bächler, D. Barna, L.S. Barnby, J. Bartke, R.A. Barton, L. Betev, H. Białkowska, A. Billmeier, C. Blume, C.O. Blyth, B. Boimska, J. Bracinik, F.P. Brady, R. Brockmann, R. Brun, P. Bunčić, L. Carr, D. Cebra, G.E. Cooper, J.G. Cramer, P. Csató, V. Eckardt, F. Eckhardt, D. Ferenc, H.G. Fischer, Z. Fodor, P. Foka, P. Freund, V. Friese, J. Ftacnik, J. Gál, R. Ganz, M. Gaździcki, E. Gładysz, J. Grebieszkow, J.W. Harris, S. Hegyi, V. Hlinka, C. Höhne, G. Igo, M. Ivanov, P. Jacobs, R. Janik, P.G. Jones, K. Kadija, V.I. Kolesnikov, M. Kowalski, B. Lasiuk, P. Lévai, A.I. Malakhov, S. Margetis, C. Markert, B.W. Mayes, G.L. Melkumov, J. Molnár, J.M. Nelson, G. Odyniec, M.D. Oldenburg, G. Pálla, A.D. Panagiotou, A. Petridis, M. Pikna, L. Pinsky, D.J. Prindle, F. Pühlhofer, J.G. Reid, R. Renfordt, W. Retyk, H.G. Ritter, D. Röhrich, C. Roland, G. Roland, A. Rybicki, T. Sammer, A. Sandoval, H. Sann, A.Yu. Semenov, E. Schäfer, N. Schmitz, P. Seyboth, F. Siklér, B. Sitar, E. Skrzypczak, R. Snellings, G.T.A. Squier, R. Stock, P. Strmen, H. Ströbele, T. Susa, I. Szarka, I. Szentpétery, J. Sziklai, M. Toy, T.A. Trainor, S. Trentalange, T. Ullrich, D. Varga, M. Vassiliou, G.I. Veres, G. Vesztergombi, S. Voloshin, D. Vranić, F. Wang, D.D. Weerasundara, S. Wenig, C. Whitten, N. Xu, T.A. Yates, I.K. Yoo, and J. Zimányi

Subjects
Physics, Nuclear and High Energy Physics, Nuclear Theory, Elliptic flow, FOS: Physical sciences, Function (mathematics), Space (mathematics), Collision, Nuclear Theory (nucl-th), Nuclear physics, Rapidity, Nuclear Experiment (nucl-ex), Anisotropy, Nucleon, Centrality, Nuclear Experiment
Abstract

New data with a minimum bias trigger for 158 GeV/nucleon Pb + Pb have been analyzed. Directed and elliptic flow as a function of rapidity of the particles and centrality of the collision are presented. The centrality dependence of the ratio of elliptic flow to the initial space elliptic anisotropy is compared to models., 4 pages, 4 figures, for the QM99 proceedings

Published
1999

25. Directed and Elliptic Flow in 158 GeV/Nucleon Pb + Pb Collisions

Author

S. Schönfelder, Gyorgy Vesztergombi, V. I. Kolesnikov, Jozsef Molnar, R. Bock, G.T.A. Squier, J. Sziklai, C. A. Whitten, Siegfried Wenig, J. Zimányi, C. O. Blyth, E. Schäfer, L. Wood, T. A. Yates, D. Vranic, A. Yu. Semenov, R. Stock, J. Gál, Lee Stuart Barnby, Alexander Malakhov, D. D. Weerasundara, R. A. Barton, Norbert Schmitz, Dieter Røhrich, C. Bormann, S. Poziombka, D. Schmischke, Andrzej Rybicki, S. Voloshin, A. Sandoval, D. Irmscher, I. Huang, D. J. Prindle, P. Seyboth, J. Bächler, M. I. Ferguson, A. M. Poskanzer, H. G. Ritter, H. G. Fischer, N. Buncic, F. Eckhardt, P. Jacobs, A. Mock, J. G. Cramer, Christina Markert, G. Odyniec, J. Seyerlein, H. L. Caines, K. Kadija, L. A. Hill, G. E. Cooper, Marek Kowalski, Torsten Henkel, B. Lasiuk, Zoltan Fodor, Fuqiang Wang, M. Fuchs, Rainer Arno Ernst Renfordt, S. Margetis, A. Piper, Peter Graham Jones, H. Rudolph, Helena Bialkowska, M. Vassiliou, V. Friese, R. Zybert, H. Hümmler, D. Flierl, Ferenc Sikler, J. Dunn, H. Appelshäuser, E. Gladysz, P. Freund, W. Retyk, G. Igo, S. J. Bailey, Peter Levai, R. J. Porter, D. Cebra, J. Günther, S. Trentalange, Apostolos Panagiotou, F. Pühlhofer, Thomas A. Trainor, M. Toy, T. Wienold, E. Skrzypczak, J. M. Nelson, Predrag Buncic, J. W. Harris, V. Eckardt, S. Hegyi, G. Roland, W. Rauch, H. Sann, J. Bartke, I. Szentpetery, C. Roland, H. Ströbele, P. Foka, Andreas Petridis, R. Brockmann, G. L. Melkumov, T. Ullrich, J. Grebieszkow, Marek Gazdzicki, Jeffrey G. Reid, F. P. Brady, P. Csato, F. Gabler, and Gergely Palla

Subjects
Physics, Particle physics, Meson, Hadron, Elliptic flow, Nuclear Theory, General Physics and Astronomy, FOS: Physical sciences, Charged particle, Baryon, Nuclear physics, Physics::Fluid Dynamics, Pion, Rapidity, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Nucleon, Nuclear Experiment
Abstract

The directed and elliptic flow of protons and charged pions has been observed from the semi-central collisions of a 158 GeV/nucleon Pb beam with a Pb target. The rapidity and transverse momentum dependence of the flow has been measured. The directed flow of the pions is opposite to that of the protons but both exhibit negative flow at low pt. The elliptic flow of both is fairly independent of rapidity but rises with pt., Comment: 12 pages including 3 figures

Published
1997
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26. First results from NA49 on Pb + Pb collisions at 158 GeV/nucleon

Author

S. Margetis, T. Alber, H. Appelshäuser, J. Bächler, J. Bartke, H. Biak̵kowska, F. Bieser, M.A. Bloomer, C.O. Blyth, R. Bock, C. Bormann, F.P. Brady, R. Brockmann, P. Buncic, H.L. Caines, D. Cebra, P. Chan, G. Cooper, J.G. Cramer, P.B. Cramer, P. Csato, I. Derado, J. Dunn, V. Eckardt, F. Eckhardt, S. Euler, M.I. Ferguson, H.G. Fischer, Z. Fodor, P. Foka, P. Freund, M. Fuchs, J. Gal, M. Gaździcki, E. Gładysz, J. Grebieszkow, J. Günther, J.W. Harris, W. Heck, S. Hegyi, L.A. Hill, I. Huang, M.A. Howe, G. Igo, D. Irmscher, P. Jacobs, P.G. Jones, K. Kadija, J. Kecskemeti, J. Kosiec, M. Kowalski, A. Kühmichel, B. Lasiuk, J.W. Mitchell, A. Mock, J.M. Nelson, G. Odyniec, J. Palinkas, G. Palla, A.D. Panagiotou, A. Petridis, A. Piper, A.M. Poskanzer, D.J. Prindle, F. Pühlhofer, W. Rauch, R. Renfordt, W. Retyk, H.G. Ritter, D. Röhrich, H. Rudolph, K. Runge, A. Sandoval, H. Sann, E. Schäfer, N. Schmitz, S. Schönfelder, P. Seyboth, J. Seyerlein, F. Sikler, E. Skrzypczak, P. Stefański, R. Stock, H. Ströbele, I. Szentpetery, J. Sziklai, M. Toy, T.A. Trainor, S. Trentalange, M. Vassiliou, G. Vesztergombi, D. Vranic, S. Wenig, C. Whitten, T. Wienold, L. Wood, J. Zimanyi, X.-Z. Zhu, and R. Zybert

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Nuclear Theory, Hadron, Nuclear physics, Energy flow, Stopping power (particle radiation), High Energy Physics::Experiment, Rapidity, Neutron, Nuclear Experiment, Nucleon, NA49 experiment, Particle Physics - Experiment
Abstract

First results from the NA49 experiment with a {sup 208}Pb beam on a Pb target at the CERN SPS with total energy of 33 TeV are presented. Data on transverse energy production, forward energy flow and rapidity density of negative hadrons are shown and discussed. The degree of nuclear stopping and the energy densities achieved are estimated for near head-on collisions.

Published
1995

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