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1. Energy dependence of hyperon production in nucleus–nucleus collisions at SPS

Author

I. J. Bloodworth, K. Šafařík, A. Jusko, P.A. Bacon, N. Carrer, A. Jacholkowski, P van de Ven, Giuseppe Bruno, P. Jovanovic, W. Snoeys, Dieter Røhrich, L. Šándor, Marek Bombara, P.C. de Rijke, Håvard Helstrup, R. Kamermans, M.F. Votruba, Federico Antinori, J. Urban, A. Vascotto, F.F. Valiev, G.S. Pappalardo, V. Lenti, A.K. Holme, M. Morando, N. Pišútová, F. Soramel, O. Villalobos Baillie, B. Ghidini, M. A. Mazzoni, V. P. Kondratiev, Rocco Caliandro, Adela Kravcakova, F. Posa, Roman Lietava, A. Belogianni, A.P. de Haas, E Quercigh, A. Palmeri, Andrea Dainese, G Martinská, M. Sené, P. Vande Vyvre, F. Navach, Anatoly Kolozhvari, Davide Elia, R. Turrisi, Leonid Vinogradov, Kristin Fanebust Hetland, M. Campbell, Franco Meddi, A. van den Brink, J. Pišút, K. Knudson, Ivan Kralik, Trine Spedstad Tveter, Francesco Riggi, T.A. Toulina, Vito Manzari, E. Schillings, Tiziano Virgili, D. Evans, N. van Eijndhoven, Pavel Staroba, P. G. Kuijer, Roberto Divia, Janka Vrlakova, P.I. Norman, G. T. Jones, M. Spyropoulou-Stassinaki, Anju Bhasin, G. A. Feofilov, E. Nappi, Wisla Carena, D. Di Bari, S A Bull, G. Romano, R. Sené, J. van Hunen, Petr Zavada, J.B. Kinson, Paraskevi Ganoti, S. Di Liberto, B. Pastirčák, Gunnar Løvhøiden, G.F. Segato, Roberto Barbera, Angela Badala, R. A. Fini, A. Michalon, T. Vik, R. F. Clarke, G. Grella, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), NA57, and Heyd, Yvette

Subjects
PB-PB COLLISIONS, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, FOS: Physical sciences, Hyperons, Lambda baryon, Xi baryon, Nuclear physics, Nuclear Physics - Experiment, Rapidity, Nuclear Experiment (nucl-ex), Nuclear Experiment, Physics, High Energy Physics::Phenomenology, Hyperon, NA57, CERN SPS, Omega baryon, [PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Baryon, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Antimatter, Quark–gluon plasma, High Energy Physics::Experiment, Quark Gluon Plasma, PB+PB COLLISIONS
Abstract

A measurement of strange baryon and antibaryon production in Pb-Pb collisions has been carried out by the NA57 experiment at the CERN SPS, with 40 and 158 A GeV/c beam momentum. Results on $\Lambda$, $\Xi$ and $\Omega$ hyperon yields at mid-rapidity in the most central 53% of Pb-Pb collisions at 40 A GeV/c are presented and compared with those obtained at higher energy, in the same collision centrality range. The $\Lambda$ and $\Xi^-$ yields per unit rapidity stay roughly constant while those of $\Omega^-$, $\bar\Lambda$, $\bar\Xi^+$ and $\bar\Omega^+$ increase when going to the higher SPS energy. Hyperon yields at the SPS are compared with those from the STAR experiment in $\sqrt{s_{NN}}$ = 130 GeV Au-Au collisions at RHIC., Comment: 9 pages, 4 figures, 3 tables, accepted for publication in Physics Letters B

Published
2004
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2. Simple Models of the Contribution of Intermediate Stage Gluons to J/ψ Suppression at the CERN SPS

Author

M. Jurčovičová, J. Pišút, K. Tokár, A. Nogová, and N. Pišútová

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, General Physics and Astronomy, Intermediate stage, Gluon, Hadronization, Nuclear physics, Thermalisation, High Energy Physics::Experiment, Nuclear Experiment, Glauber, Free parameter
Abstract

We construct three simple scenarios of the time dependence of density of intermediate stage gluons in nuclear collisions in the CERN SPS energy range. Gluons with energy of about 0.6–1.0 GeV are assumed to be produced in nucleon-nucleon collisions in a Glauber type model. The rate of gluon production is given by the parameter ng/nn equal to the average number of gluons produced per nucleon-nucleon collision. The value of this parameter determines the behaviour of the gas of gluons. The number of gluons increases due to gluon branching and processes like g+g → g+g+g and decreases due to the hadronization. Gluons are assumed to be able to dissociate J/ψ in g+J/ψ collisions, the dissociation cross-section σgγ is taken as a free parameter. In the first scenario, the energy density of the gas of gluons never reaches the critical energy density ec ≈ 0.7 GeV/fm3 and gluons rapidly hadronize. In the second scenario, the critical energy density is reached but the system of gluons is unable to reach thermalization. In the third scenario gluons reach thermalization and the thermalized system suppresses J/ψ by the Matsui-Satz mechanism. The third scenario under the assumption of a small value of σgψ is able to describe qualitatively the data on J/ψ suppression in Pb−Pb interactions obtained by the NA50 Collaboration. Other scenarios have problems with getting the rather abrupt onset of J/ψ suppression.

Published
2004
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3. Hyperon yields in PbPb collisions from the NA57 experiment

Author

A. Badalà, V. P. Kondratiev, R. A. Fini, J. van Hunen, A. Michalon, K. Knudson, Anju Bhasin, G. A. Feofilov, T.A. Toulina, O. Villalobos-Baillie, Petr Zavada, P.C. de Rijke, Trine Spedstad Tveter, Pavel Staroba, Ivan Kralik, Roberto Divia, P. Vande Vyvre, Haavard Helstrup, V. Lenti, W. Snoeyes, R. Turrisi, G. Martinská, M.F. Votruba, S A Bull, F. Posa, Roman Lietava, N. van Eijndhoven, P. Jovanovic, Andrea Dainese, M. Morando, J. Pišút, P.I. Norman, B. Ghidini, G. T. Jones, P. van den Ven, K. Šafařík, Franco Meddi, J.B. Kinson, Roberto Barbera, J. Urban, Anatoly Kolozhvari, M. Henriquez, K. Fanebust, A. Jusko, Gunnar Løvhøiden, G. Romano, F.F. Valiev, Tiziano Virgili, Rocco Caliandro, Giacomo Bruno, I. J. Bloodworth, G.F. Segato, D. Di Bari, Davide Elia, R. Sené, Vito Manzari, A. Belogianni, M. A. Mazzoni, E Quercigh, L. Šándor, A. Palmeri, M. Sené, M. Campbell, P. G. Kuijer, David H. Evans, A. Vascotto, Paraskevi Ganoti, Francesca Soramel, F. Fayazzadeh, D. Röhrich, E. Nappi, A. van den Brink, Federico Antinori, M. Spyropoulou-Stassinaki, J. Fedorisin, Adela Kravcakova, A.P. de Haas, S. Di Liberto, R. Kammermans, B. Pastirčák, Janka Vrlakova, A. Jacholkowski, F. Navach, Wisla Carena, T. Vik, R. F. Clarke, N Carrer, Francesco Riggi, G. Grella, A.K. Holme, N. Pišútová, Leonid Vinogradov, E. Schillings, and G.S. Pappalardo

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Large Hadron Collider, Nuclear Theory, Hyperon, Strangeness, Collision, Interaction volume, Atomic and Molecular Physics, and Optics, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Nucleon
Abstract

The new results on hyperon production in Pb-Pb collisions at 158 A GeV/c and 40 A GeV/c are presented. Publisher Summary This chapter discusses the yields of hyperon in Pb–Pb collisions from the NA57 experiment. The aim of NA57 was to study the dependence of the strangeness enhancement on the interaction volume and the collision energy per incoming nucleon. The centrality range of the NA57 experiment extended down to a limit of about 50 wounded nucleons. The experiment collected data using 158 and 40 A GeV/c beams at the CERN SPS. There was indication of an increase of the enhancements with the centrality of the collisions. The data were corrected for acceptance and efficiency losses by calculating weight for each particle with a GEANT-based Monte-Carlo simulation.

Published
2003
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4. The shape of dilepton spectra in heavy ion collisions as a signature of quark-gluon plasma

Author

N. Pišútová, J. Pišút, and Jozef Masarik

Subjects
Physics, Physics and Astronomy (miscellaneous), Nuclear Theory, High Energy Physics::Phenomenology, Plasma, Spectral line, Ion, Nuclear physics, Quark–gluon plasma, High Energy Physics::Experiment, Heavy ion, Atomic physics, Mixed phase, Nuclear Experiment, Engineering (miscellaneous)
Abstract

The formation of quark-gluon plasma in heavy ion collisions should manifest itself by the increase of the ratio of medium to large mass dileptons, the former being produced predominantly in the QGP and the mixed phase whereas the latter are produced mostly by the Drell-Yan process. The increase of this ratio should be visible either when comparing collisions of lighter with heavier ions, e.g. O+O with Pb+Pb or when comparing low and large transverse energy events in heavy ion e.g. Pb+Pb collisions.

Published
1993
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5. ϕ-Enhancement andJ/ψ-suppression in nuclear collisions—does the combination signal quark-gluon plasma formation?

Author

J. Pišút, P. Koch, and Ulrich Heinz

Subjects
Physics, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Meson, Nuclear Theory, Hadron, Phase (waves), Plasma, Nuclear physics, Particle acceleration, Quark–gluon plasma, Chemical equilibrium, Nuclear Experiment, Engineering (miscellaneous)
Abstract

We point out that recent indications from the NA38 collaboration at CERN for an increase of theΦ(ω+ρ0) ratio in central 200A GeVO+U andS+U collisions give evidence for an appr chemical equilibrium in these collisions. We different mechanisms for such a behavior, the hypothetical formation of a transient plasma (QGP) phase and a hadronic rescattering scenario. Theoretical uncertainties in the hadronic rescattering calculation are eliminated by linking the ϕ enhancement to the suppression ofJ/ψ mesons observed in the same experiment. We find that the data are most easily “explained” by postulating QGP formation in a fraction of the central collisions, but that a simultaneous quantitative description of both phenomena can also be obtained via hadronic rescattering. Even though in the latter case very high particle densities in the collision zone are required, a purely hadronic mechanism for the observations can thus presently not be excluded.

Published
1990
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6. Hyperon production in 40 A GeV/c collisions from the NA57 experiment

Author

Anju Bhasin, G. A. Feofilov, M. Henriquez, P. Vande Vyvre, R. Turrisi, L. Šándor, J. Urban, J. Pišút, Roberto Barbera, F. Navach, A. Vascotto, Haavard Helstrup, J. van Hunen, A. Badalà, K. Knudson, Francesca Soramel, F. Posa, Roman Lietava, Vito Manzari, G.S. Pappalardo, Anatoly Kolozhvari, O. Villalobos Baillie, V. P. Kondratiev, T. Vik, Gunnar Løvhøiden, R. F. Clarke, Petr Zavada, A. van den Brink, Davide Elia, Rocco Caliandro, I. J. Bloodworth, D. Evans, Ivan Kralik, Trine Spedstad Tveter, S. Di Liberto, B. Pastirčák, P. G. Kuijer, R. A. Fini, Pavel Staroba, R. Sené, J. Fedorisin, Adela Kravcakova, A. Michalon, N Carrer, A. Belogianni, M. A. Mazzoni, Francesco Riggi, P.I. Norman, G. T. Jones, Roberto Divia, P.C. de Rijke, G.F. Segato, E Quercigh, M. Morando, Dieter Røhrich, P. Jovanovic, K. Fanebust, G. Grella, A. Palmeri, B. Ghidini, Leonid Vinogradov, Paraskevi Ganoti, E. Nappi, Wisla Carena, J.B. Kinson, F.F. Valiev, M. Sené, V. Lenti, R. Kamermans, M.F. Votruba, M. Campbell, E. Schillings, Federico Antinori, G Martinská, S A Bull, M. Spyropoulou-Stassinaki, A.P. de Haas, G. Romano, Franco Meddi, Tiziano Virgili, A.K. Holme, N. Pišútová, A. Jusko, P van de Ven, Giuseppe Bruno, D. Di Bari, Karel Safarik, A. Jacholkowski, W. Snoeys, T.A. Toulina, F. Fayazzadeh, Janka Vrlakova, N. van Eijndhoven, and Andrea Dainese

Subjects
Baryon, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Nuclear Theory, Hyperon, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Enhancements of strange baryon and anti-baryon yields were first observed in Pb–Pb interactions at 160 A GeV/c by WA97. The aim of the NA57 experiment is to investigate how these enhancements behave as a function of energy, and over a broader centrality range than that which was available with WA97. This paper presents a comparison of the hyperon yields in Pb–Pb interactions at 40 A GeV/c and 160 A GeV/c. Preliminary signals for the p-Be data at 40 A GeV/c are also shown.

Published
2004

7. Hyperon production in lead-lead interactions at 40 and 160 A GeV/c

Author

T. Vik, R. F. Clarke, N Carrer, Francesco Riggi, G. Grella, A. Badalà, L. Šándor, R. Kamermans, G.S. Pappalardo, M.F. Votruba, Giuseppe Bruno, V. Lenti, A. Vascotto, A. Belogianni, O. Villalobos Baillie, V. P. Kondratiev, E Quercigh, Franco Meddi, Francesca Soramel, M. Sené, M. Campbell, E. Nappi, I. J. Bloodworth, P.A. Bacon, F.F. Valiev, A. Palmeri, Anju Bhasin, Anatoly Kolozhvari, J. Urban, A. van den Brink, G. A. Feofilov, A.K. Holme, Davide Elia, Leonid Vinogradov, M. A. Mazzoni, S A Bull, Dieter Røhrich, D. Evans, K. Šafařík, Trine Spedstad Tveter, R. Sené, M Bombara, N. van Eijndhoven, G Martinská, Ivan Kralik, N. Pišútová, Tiziano Virgili, E. Schillings, A. Jusko, F. Navach, P van de Ven, P.I. Norman, G. T. Jones, P.C. de Rijke, Andrea Dainese, Wisla Carena, M. Spyropoulou-Stassinaki, Petr Zavada, Pavel Staroba, Roberto Divia, J. van Hunen, T.A. Toulina, Federico Antinori, J.B. Kinson, Rocco Caliandro, A.P. de Haas, Vito Manzari, G. Romano, M. Morando, B. Ghidini, P. Vande Vyvre, R. Turrisi, P. G. Kuijer, J. Pišút, Janka Vrlakova, K. Knudson, D. Di Bari, Haavard Helstrup, A. Jacholkowski, G.F. Segato, W. Snoeys, F. Posa, Roman Lietava, P. Jovanovic, K. Fanebust, Adela Kravcakova, Gunnar Løvhøiden, R. A. Fini, A. Michalon, Roberto Barbera, S. Di Liberto, B. Pastirčák, Paraskevi Ganoti, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and NA57

Subjects
Physics, Physics and Astronomy (miscellaneous), Nuclear Theory, Hadron, Hyperon, Elementary particle, Fermion, Strangeness, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Baryon, Nuclear physics, Antimatter, Transverse mass, Nuclear Experiment, Engineering (miscellaneous)
Abstract

The NA57 experiment has measured strange baryon and antibaryon production in Pb-Pb collisions at 40 A GeV/c and 160 A GeV/c beam momenta. This presentation covers strangeness enhancement and transverse spectra from the 160 A GeV/c data, and energy dependence of the particle yields. Enhancement factors increase with increasing strangeness content of the particle, when production yields from Pb-Pb collisions are compared with those observed in p-Be and p-Pb interactions. The transverse mass spectra have been analysed both with exponential fits and using a transverse flow model.

Published
2003
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8. Strange Baryon Production from the NA57 Experiment at the CERN SPS

Author

F.F. Valiev, J. Urban, Federico Antinori, I. J. Bloodworth, Anju Bhasin, M. A. Mazzoni, Anton Jusko, Ivan Kralik, B. Ghidini, G. A. Feofilov, K. Fanebust, R. A. Fini, A.P. de Haas, A. Michalon, F. Navach, P. Vande Vyvre, Dieter Røhrich, Giuseppe Bruno, Rocco Caliandro, M. Luptak, M. Campbell, J. Pišút, P.C. de Rijke, G.F. Segato, E. Quercigh, Angela Badala, G. Romano, T. Vik, R. F. Clarke, O. Villalobos Baillie, V. P. Kondratiev, A.K. Holme, F. Fayazzadeh, Franco Meddi, K. Šafařík, G. Martinská, J. Ftacnik, Andrea Dainese, A. Kolojvari, N. Carrer, Rosario Turrisi, Trine Spedstad Tveter, R. Kamermans, M.F. Votruba, S A Bull, T.A. Toulina, D. Muigg, E. Nappi, M. Sené, K. Knudson, V. Lenti, A. Belogianni, Tiziano Virgili, A. Jacholkowski, N. Pisutova, M. Morando, vho, Leonid Vinogradov, M. Spyropoulou-Stassinaki, Petr Zavada, G. Lo, N. van Eijndhoven, F. Posa, P.I. Norman, G. T. Jones, Pavel Staroba, L. Sandor, Haavard Helstrup, P. van den Ven, E. Schillings, Roberto Divia, Wisla Carena, D. Di Bari, A. van den Brink, D. Evans, M. Henriquez, iden, Francesco Riggi, G. S. Pappalardo, P. G. Kuijer, D. Elia, G. Grella, Vito Manzari, F. Soramel, A. Vascotto, W. Snoeys, R. Lietava, R. Sené, J.B. Kinson, J. van Hunen, A. Palmeri, Janka Vrlakova, P. Jovanovic, J. Fedorisin, Adela Kravcakova, S. Di Liberto, B. Pastirčák, and Roberto Barbera

Subjects
Physics, Particle physics, Strange quark, Physics::Instrumentation and Detectors, Nuclear Theory, Hyperon, Omega baryon, Lambda baryon, Xi baryon, Sigma baryon, Baryon, Nuclear physics, Strange matter, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The production of strange baryons and anti‐baryons in PbPb and pBe collisions has been studied by the NA57 experiment at the CERN SPS, extending down the centrality range covered by the previous WA97 experiment, and collecting data at two different energies. The enhanced production of such particles in central PbPb collisions with respect to pBe has been experimentally confirmed. This paper discusses results on Ⅺ and Λ hyperon production obtained at 40 and 158 A GeV/c.

Published
2002
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9. Centrality dependence of strange baryon yields in Pb-Pb collisions

Author

I. J. Bloodworth, S. Di Liberto, J. Fedorisin, Adela Kravcakova, Petr Zavada, F.F. Valiev, Anju Bhasin, B. Pastirčák, A. Kolojvari, N. Carrer, J. Ftacnik, Giuseppe Bruno, G. A. Feofilov, F. Fayazzadeh, Andrea Dainese, Dieter Røhrich, L. Sandor, Haavard Helstrup, M. Henriquez, K. Fanebust, J. van Hunen, J. Pisutova, E. Nappi, Pavel Staroba, Roberto Divia, Gunnar Løvhøiden, D. Elia, J. Urban, T.A. Toulina, D. Muigg, Vito Manzari, G. Romano, E. Schillings, A. Vascotto, Wisla Carena, G. Martinská, A. Palmeri, D. Di Bari, Janka Vrlakova, N. van Eijndhoven, I. Vinogradov, Karel Safarik, W. Snoeys, M. Luptak, G.F. Segato, G. S. Pappalardo, P. G. Kuijer, D. Evans, P van de Ven, Trine Spedstad Tveter, P. Jovanovic, E. Quercigh, Angela Badala, O. Villalobos Baillie, V. P. Kondratiev, Roberto Barbera, R. Kamermans, M.F. Votruba, Rocco Caliandro, P.I. Norman, G. T. Jones, A. Jacholkowski, M. Campbell, J.B. Kinson, A. van den Brink, S A Bull, Rosario Turrisi, R. A. Fini, A. Michalon, K. Knudson, M. Morando, R. Sené, M. Sené, V. Lenti R. Lietava, P. Vande Vyvre, J. Pišút, F. Posa, Anton Jusko, Ivan Kralik, F. Soramel, Federico Antinori, A.K. Holme, A.P. de Haas, Franco Meddi, Tiziano Virgili, M. A. Mazzoni, B. Ghidini, F. Navach, T. Vik, R. F. Clarke, Francesco Riggi, G. Grella, Heyd, Yvette, Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and NA57

Subjects
Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Nuclear Theory, Phase (waves), Function (mathematics), Collision, 01 natural sciences, Baryon, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Nucleon, Centrality, Nuclear Experiment
Abstract

PoS(hep2001)248; New data on strange baryon yields in Pb–Pb interactions at 158 GeV/c per nucleon are presented as a function of the collision centrality. The possible onset of a deconfined phase when the collision involves from 50 to 100 wounded nucleons is discussed.

Published
2001

10. Results on hyperon production from CERN NA57 experiment

Author

M. Sené, Franco Meddi, M. Henriquez, A. Jacholkowski, D. Elia, Leonid Vinogradov, E. Nappi, V. Lenti, Tiziano Virgili, Vito Manzari, E. Schillings, Pavel Staroba, Roberto Divia, F. Soramel, Anton Jusko, Ivan Kralik, R. Kamermans, Federico Antinori, M.F. Votruba, Giuseppe Bruno, N. van Eijndhoven, P.C. de Rijke, R. Lietava, Wisla Carena, R. Sené, Rocco Caliandro, J. Urban, D. Di Bari, S A Bull, Janka Vrlakova, M. Campbell, A. Vascotto, D. Evans, J. Ftacnik, A.P. de Haas, F.F. Valiev, L. Sandor, J. Fedorisin, Adela Kravcakova, K. Šafařík, Trine Spedstad Tveter, Haavard Helstrup, K. Fanebust, J.B. Kinson, F. Fayazzadeh, W. Snoeys, A.K. Holme, M. A. Mazzoni, P.I. Norman, G. T. Jones, J. van Hunen, B. Ghidini, I. J. Bloodworth, P. Jovanovic, P van de Ven, P. Vande Vyvre, A. Palmeri, J. Pišút, F. Navach, Dieter Røhrich, Petr Zavada, K. Knudson, N. Pisutova, G. Romano, A. van den Brink, N. Carrer, O. Villalobos Baillie, V. P. Kondratiev, G. S. Pappalardo, P. G. Kuijer, Rosario Turrisi, M. Morando, Roberto Barbera, Anatoly Kolozhvari, Anju Bhasin, Francesco Riggi, G. A. Feofilov, G. Grella, F. Posa, S. Di Liberto, T. Vik, B. Pastirčák, R. F. Clarke, T.A. Toulina, D. Muigg, Gunnar Løvhøiden, M. Luptak, G.F. Segato, E. Quercigh, Angela Badala, R. A. Fini, A. Michalon, G. Martinská, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), NA57, and Heyd, Yvette

Subjects
Physics, Particle physics, Large Hadron Collider, Nuclear Theory, Hyperon, Xi baryon, Baryon, Momentum, Nuclear physics, [PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Quark–gluon plasma, High Energy Physics::Experiment, Nuclear Experiment, Nucleon, Beam (structure)
Abstract

NA57 has been specifically designed to study the onset of strange baryon and antibaryon enhancements in Pb-Pb with respect to p-Be collisions, first observed by the WA97 experiment at 160 A GeV/c beam momentum. The aim is to look for the dependence of these enhancements on the interaction volume, as measured by the number of wounded nucleons, and the energy per incoming nucleon. In NA57 the centrality range goes down to a lower limit of about 50 wounded nucleons, compared with about 100 in WA97. Data have been collected both at 160 and at 40 A GeV/c, while WA97 collected data only at the top SPS beam momentum of 160 A GeV/c. In this contribution we recall the main features of the NA57 experiment and we present the first results on Ⅺ− and Ⅺ+ hyperon production in Pb-Pb collisions at 160 A GeV/c.

Published
2001

11. Relativistic corrections to quantum mechanical concept ofJ/ψ formation time

Author

A. Nogová, R. Lietava, and J. Pišút

Subjects
Physics, Physics and Astronomy (miscellaneous), Quantum electrodynamics, Quantum mechanics, Nuclear Theory, Plasma, Relativistic quantum chemistry, Engineering (miscellaneous), Quantum
Abstract

The effect ofJ/ψ dissolution in quark-gluon plasma is calculated within quantum mechanical approach taking into account also relativistic corrections. It is found that relativistic effects do not influence significantly the time dependence of theJ/ψ dissolution. Consequently the rate ofJ/ψ suppression is not dramatically changed.

Published
1992
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12. On the transverse energy distributions in the central rapidity region of 16O+Pb collisions at 200 GeV per nucleon

Author

K. Kajantie, J. Ftacnik, J. Pišút, and N. Pišútová

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, SIMPLE (dark matter experiment), Particle physics, Transverse plane, Large Hadron Collider, Nuclear Theory, Hadron, Rapidity, Nuclear Experiment, Nucleon, Energy (signal processing)
Abstract

We point out that the recent data obtained by the NA35 collaboration at the CERN SPS on E T distributions in 16 O + Pb collisions can be understood within the wounded nucleon model with a simple geometrical calculation of the number of interacting nucleons in 16 O. Although the large E T trigger increases the average E T per final state hadron, we are unable to explain in this way the observed rather large value of this quantity.

Published
1987
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13. Hadrons produced in association with Drell-Yan dimuons in π−p interactions and quantum numbers of quarks

Author

J. Pišút, V. Černý, and Peter Lichard

Subjects
Physics, Nuclear physics, Quark, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Charge (physics), Nuclear Experiment, Quantum number
Abstract

We present a quark-parton model for reactions π − p → μ + μ − + hadrons and π − p → hadrons. The model can give detailed prescriptions about relationships between the two reactions. In particular it predicts that the difference of charge distributions d Q /d y in the two reactions will give a direct and unambiguous determination of the charge of the up-quark.

Published
1978
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14. A simple model of large transverse-energy events in proton-nucleus interactions

Author

Peter Lichard, N. Pišútová, and J. Pišút

Subjects
Physics, Nuclear and High Energy Physics, SIMPLE (dark matter experiment), Large Hadron Collider, Proton, Nuclear Theory, Hadron, Nuclear physics, Transverse plane, medicine.anatomical_structure, medicine, High Energy Physics::Experiment, Nuclear Experiment, Nucleus, Energy (signal processing)
Abstract

Qualitative features of the preliminary data on large transverse-energy proton-Pb collisions at 200 GeV c obtained by the HELIOS collaboration at CERN are reproduced by a simple model in which the large transverse energy is built up by a large amount of soft final-state hadrons.

Published
1986
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15. Correlations between transverse energy production and the Drell-Yan process in heavy ion collisions at high energy

Author

Martin Mojžiš, J. Pišút, and J. Ftacnik

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, High Energy Physics::Phenomenology, Drell–Yan process, Plasma, Bin, Nuclear physics, Cross section (physics), Transverse plane, High Energy Physics::Experiment, Rapidity, Heavy ion, Nuclear Experiment, Energy (signal processing)
Abstract

The expression for the Drell-Yan cross section is presented which takes into account the geometry of heavy ion collisions. The Drell-Yan cross section is shown to be proportional to the transverse energy produced within a fixed rapidity interval. A dependence steeper than linear of the cross section for production of dileptons with masses larger than about 2 GeV on the transverse energy in a given rapidity bin would be a clear-cut signal for the formation of the quark-gluon plasma.

Published
1987
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16. An alternative mechanism of suppression in heavy ion collisions

Author

J. Ftacnik, J. Pišút, and Peter Lichard

Subjects
Physics, Nuclear and High Energy Physics, High energy, Phase transition, Particle physics, Large Hadron Collider, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Plasma, Nuclear physics, Quark–gluon plasma, High Energy Physics::Experiment, Heavy ion, Nuclear Experiment
Abstract

We argue that J ψ suppression observed recently in high energy oxygen-uranium collisions by the NA38 Collaboration at CERN need not imply that the quark-gluon plasma was produced. A considerable part of the effect may be caused by the disintegration of J ψ 's in collisions with dense hadronic matter (below the phase transition into quark-gluon plasma) produced simultaneously with J ψ in heavy ion interactions.

Published
1988
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