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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

2. Hyperon yields in PbPb collisions from NA57 experiment

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Hyperon, Humanities
Abstract

F. Antinori’, A. Bada&‘, R. Barberag, A. Belogiannia, A. Bhasine, I.J. Bloodworthe, G.E. Bruno*, S.A. Bulle, R. Caliandro*, M. Campbellh, W. Carenah, N. Carrerh, R.F. Clarkee, A. Dainese’, A.P. de Haa.9, P.C. de Rijkes, D. Di Bari*, S. Di Liberto’, R. Diviah, D. Elia*, D. Evanse, K. Fanebus@, F. Fayazzadeh”, J. Fedorisin j, G.A. Feofilov*, R.A. Fini*, P. Ganotia, B. Ghidini*, G. Grellap, H. Helstrupd, M. Henriquez”, A.K. Holmek, A. Jacholkowski*, G.T. Jonese, P. Jovanovice, A. Juskoi, R. KamermansS, J.B. Kinsone, K. Knudsonh, A.A. Kolozhvariq, V. Kondratiev ‘3, I. Kr&liki, A. KravEBkova*, P. Kuije?, V. Lenti*, R. Lietavae, G. Lovhoiden”, V. Manzari*, G. Martinskaj, M.A. MazzoniO, F. Meddi’, A. Michalonr, M. Morando’, E. Nappi*, F. Navach*, P.I. Normane, A. Palmeris, G.S. Pappalardog, B. PastirE&ki, J. Pi&, N. Pisutovaf, F. Posa*, E. Quercigh’, F. Rig@, D. RGhrich’, G. RomanoP, K. Safafikh, L. SBndo$‘, E. Schillin&, G. Segato’, M. SenCm, R. Sent?, W. Snoeysh, F. Soramel’, M. Spyropoulou-Stassinaki ‘, P. Staroba”, T.A. ToulinaQ, R. Turrisi’, T.S. Tveterk, J. Urbinj, F. Valievq, A. van den Brinks, P. van de Ven’, P. Vande Vyvreh, N. van Eijndhovens, J. van Hunenh, A. Vascottoh, T. Vik”, 0. Villalobos Bailliee, L. Vinogradovq, T. Virgil?‘, M.F. Votrubae, J. Vrlikovd and P. Zavadan

Published
2003

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

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

5. Hyperon production at the CERN SPS: results from the NA57 experiment

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Nuclear Theory, Hadron, Hyperon, Elementary particle, Xi baryon, Nuclear physics, Baryon, Antimatter, High Energy Physics::Experiment, Nuclear Experiment, Nucleon
Abstract

New results on strange baryon and antibaryon production in Pb-Pb collisions at 40 and 160 GeV per nucleon are presented. In particular, we have increased significantly the statistics of the Ξ - and Ξ + samples at 160 GeV per nucleon. The dependence of particle yields and spectra on collision centrality and energy of interaction is analysed.

Published
2004

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

8. Results on 40 A GeV/c PbPb collisions from the NA57 experiment

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Nuclear Theory, Hyperon, Hyperons, Strangeness, Nuclear physics, Baryon, High Energy Physics::Experiment, Quark Gluon Plasma, Nuclear Experiment, Beam energy
Abstract

The NA57 experiment has been designed to study the onset of the strange baryon and antibaryon enhancements in Pb Pb with respect to p-Be collisions, first observed by WA97 at 160 A GeV/ c . NA57 has extended the WA97 measurements to investigate the evolution of strangeness enhancement over a wider centrality range and as a function of the beam energy. Results on hyperon production in central Pb Pb collisions at 40 A GeV/ c are presented and compared with those obtained at higher energy, in the same centrality range.

Published
2003

9. 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

10. Results on hyperon production from Na57

Author

M. Morando, S A Bull, Kondratev, Pavel Staroba, B. Ghidini, Roberto Divia, Domenico Di Bari, Karel Safarik, R. A. Fini, W. Snoeys, Giuseppe Bruno, A. Michalon, Ivan Kralik, P. Vande Vyvre, F.F. Valiev, K. Knudson, Anju Bhasin, F. Navach, G. A. Feofilov, R. Lietava, Petr Zavada, P.C. de Rijke, Trine Spedstad Tveter, M. Sené, Kristin Fanebust Hetland, T. Vik, Federico Antinori, R. Sené, Haavard Helstrup, E. Nappi, P. G. Kuijer, G Martinská, M. Campbell, R. Barbera, Rocco Caliandro, P.I. Norman, R. F. Clarke, G. T. Jones, S. Di Liberto, M. Spyropoulou-Stassinaki, D. Muigg, P. Jovanovic, F. Soramel, B. Pastirčák, Gunnar Løvhøiden, A. Palmeri, Davide Elia, J.B. Kinson, M. Luptak, G.F. Segato, Jozef Urban, M. A. Mazzoni, L. Šándor, E. Quercigh, G.S. Pappalardo, Jan Pisut, O. Villalobos Baillie, A.P. de Haas, A. Vascotto, Lenti, Manzari, F. Posa, J. van Hunen, G. Romano, J. Ftacnik, N Carrer, A.K. Holme, A. Belogianni, Franco Meddi, N. Pišútová, David H. Evans, G. Grella, A. Jacholkowski, A. van den Brink, J. Fedorisin, Adela Kravcakova, A.A. Kolozhvarii, Tiziano Virgili, Francesco Riggi, T.A. Tulina, E. Schillings, A. Jusko, P van de Ven, Wisla Carena, Janka Vrlakova, A. Badalà, I. J. Bloodworth, N. van Eijndhoven, I. Vinogradov, Dieter Røhrich, R. Kamermans, M.F. Votruba, F. Fayazzadeh, Andrea Dainese, M. Henriquez, Rosario Turrisi, 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, Nuclear and High Energy Physics, Focus (computing), Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Theory, Hyperon, Hyperons, Baryon, Nuclear physics, Quark Gluon Plasma, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Production (economics), Nuclear Experiment
Abstract

The NA57 experiment has been designed to study the onset of enhanced production of strange baryons and anti-baryons in Pb-Pb collisions with respect to p-Be collisions. Results from 40 and 160 A GeV/c Pb-Pb data will be shown. The main focus is on the checks of the NA57 analysis chain.

Published
2001

11. 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

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