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12 results on '"J. Pišút"'

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. Multiplicity of charged particles in Pb-Pb collisions at SPS energies

Author

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

Subjects
History, Nuclear and High Energy Physics, Particle physics, FOS: Physical sciences, Venus, 01 natural sciences, 7. Clean energy, Education, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Rapidity, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics, Physics, Large Hadron Collider, biology, 010308 nuclear & particles physics, biology.organism_classification, Charged particle, Computer Science Applications, High Energy Physics::Experiment, Nucleon, Particle Physics - Experiment
Abstract

The multiplicity of charged particles in the central rapidity region has been measured by the NA57 experiment in Pb--Pb collisions at the CERN SPS at two beam momenta: 158 A GeV/{\it c} and 40 A GeV/{\it c}. The value of $dN_{ch}/d\eta$ at the maximum has been determined and its behaviour as a function of centrality has been studied in the centrality range covered by NA57 (about 50% of the inelastic cross section). The multiplicity increases approximately logarithmically with the centre of mass energy., Comment: 19 pages, 8 figures

Published
2005
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5. 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

6. 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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7. 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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8. 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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9. 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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10. 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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11. Remarks on the Wolf ππ phase shifts and the calculation ofg A /g V ratio from adler ππ sum rule

Author

J. Pišút

Subjects
Physics, Nuclear and High Energy Physics, Nuclear magnetic resonance, Consistency (statistics), Dispersion relation, Hadron, Phase (waves), Sum rule in quantum mechanics, Mathematical physics
Abstract

The consistency of pion-pion phase shifts recently proposed byG. Wolf with dispersion relations is briefly mentioned. Using these phase shifts theg A /g V ratio is calculated fromAdler ππ sum rule. The calculated value isg A /g V =1,08. Some possibilities of reducing the discrepancy between the calculated and experimental values are discussed.

Published
1967
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