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11 results on '"P I Norman"'

1. Expansion dynamics of Pb–Pb collisions at 40AGeV/cviewed by negatively charged hadrons

Author

NA57 Collaboration, F Antinori, P Bacon, A Badalà, R Barbera, A Belogianni, I J Bloodworth, M Bombara, G E Bruno, S A Bull, R Caliandro, M Campbell, W Carena, N Carrer, R F Clarke, A Dainese, D Di Bari, S Di Liberto, R Divià, D Elia, D Evans, G A Feofilov, R A Fini, P Ganoti, B Ghidini, G Grella, H Helstrup, K F Hetland, A K Holme, A Jacholkowski, G T Jones, P Jovanovic, A Jusko, R Kamermans, J B Kinson, K Knudson, V Kondratiev, I Králik, A Kravčáková, P Kuijer, V Lenti, R Lietava, G Løvhøiden, V Manzari, M A Mazzoni, F Meddi, A Michalon, M Morando, P I Norman, A Palmeri, G S Pappalardo, B Pastirčák, R J Platt, E Quercigh, F Riggi, D Röhrich, G Romano, R Romita, K Šafařík, L Šándor, E Schillings, G Segato, M Sené, R Sené, W Snoeys, F Soramel, M Spyropoulou-Stassinaki, P Staroba, R Turrisi, T S Tveter, J Urbán, P van de Ven, P Vande Vyvre, A Vascotto, T Vik, O Villalobos Baillie, L Vinogradov, T Virgili, M F Votruba, J Vrláková, P Závada, 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, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), 010308 nuclear & particles physics, Nuclear Theory, Hadron, Dynamics (mechanics), FOS: Physical sciences, 12.38.Mh, 25.75.Nq, 25.75.Ld, 25.75.Dw, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Spectral line, Nuclear physics, Momentum, 0103 physical sciences, Thermal, Transverse mass, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract

In this paper we present results on transverse mass spectra and Hanbury-Brown and Twiss correlation functions of negatively charged hadrons, which are expected to be mostly negative pions, measured in Pb-Pb collisions at 40 A GeV/c beam momentum. Based on these data, the collision dynamics and the space-time extent of the system at the thermal freeze-out are studied over a centrality range corresponding to the most central 53% of the Pb--Pb inelastic cross section. Comparisons with freeze-out conditions of strange particles and HBT results from other experiments are discussed., 29 pages, 18 figures

Published
2007
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2. Enhancement of hyperon production at central rapidity in 158AGeV/cPb–Pb collisions

Author

NA57 Collaboration, F Antinori, P Bacon, A Badalà, R Barbera, A Belogianni, W Beusch, I J Bloodworth, M Bombara, G E Bruno, S A Bull, R Caliandro, M Campbell, W Carena, N Carrer, R F Clarke, A Dainese, D Di Bari, S Di Liberto, R Divià, D Elia, D Evans, G A Feofilov, R A Fini, P Ganoti, B Ghidini, G Grella, H Helstrup, K F Hetland, A K Holme, D Huss, A Jacholkowski, G T Jones, P Jovanovic, A Jusko, R Kamermans, J B Kinson, K Knudson, V Kondratiev, I Králik, A Kravčáková, P Kuijer, V Lenti, R Lietava, R A Loconsole, G Løvhøiden, V Manzari, M A Mazzoni, F Meddi, M E Michalon-Mentzer, A Michalon, M Morando, P I Norman, A Palmeri, G S Pappalardo, B Pastirčák, R J Platt, E Quercigh, F Riggi, D Röhrich, G Romano, K Šafařík, L Šándor, E Schillings, G Segato, M Sené, R Sené, W Snoeys, F Soramel, M Spyropoulou-Stassinaki, P Staroba, M Thompson, R Turrisi, T S Tveter, J Urbán, P van de Ven, P Vande Vyvre, A Vascotto, T Vik, O Villalobos Baillie, L Vinogradov, T Virgili, M F Votruba, J Vrláková, P Závada, 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, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Hyperon, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Strangeness, Lambda, 01 natural sciences, Omega, Nuclear physics, 0103 physical sciences, Transverse momentum, Rapidity, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Nucleon, Nuclear Physics
Abstract

Results are presented on hyperon and antihyperon production in Pb-Pb, pPb and pBe collisions at 158 GeV/c per nucleon. Lambda, Xi and Omega yields have been measured at central rapidity and medium transverse momentum as functions of the centrality of the collision. Comparing the yields in Pb-Pb to those in pBe interactions, strangeness enhancement is observed. The enhancement increases with the centrality and with the strangeness content of the hyperons, reaching a factor of about 20 for the Omega in the central Pb-Pb collisions., submitted to J. Phys. G.: Nucl. Part. Phys

Published
2006
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3. Hyperon production in 40AGeV/ccollisions from the NA57 experiment

Author

Collaboration), P I Norman (for the NA57, primary, Antinori, F, additional, Badalà, A, additional, Barbera, R, additional, Belogianni, A, additional, Bhasin, A, additional, Bloodworth, I J, additional, Bruno, G E, additional, Bull, S A, additional, Caliandro, R, additional, Campbell, M, additional, Carena, W, additional, Carrer, N, additional, Clarke, R F, additional, Dainese, A, additional, Haas, A P de, additional, Rijke, P C de, additional, Bari, D Di, additional, Liberto, S Di, additional, Divia, R, additional, Elia, D, additional, Evans, D, additional, Fanebust, K, additional, Fayazzadeh, F, additional, Fedori in, J, additional, Feofilov, G A, additional, Fini, R A, additional, Ganoti, P, additional, Ghidini, B, additional, Grella, G, additional, Helstrup, H, additional, Henriquez, M, additional, Holme, A K, additional, Jacholkowski, A, additional, Jones, G T, additional, Jovanovic, P, additional, Jusko, A, additional, Kamermans, R, additional, Kinson, J B, additional, Knudson, K, additional, Kolozhvari, A A, additional, Kondratiev, V, additional, Králik, I, additional, Krav áková, A, additional, Kuijer, P, additional, Lenti, V, additional, Lietava, R, additional, Løvhøiden, G, additional, Manzari, V, additional, Martinská, G, additional, Mazzoni, M A, additional, Meddi, F, additional, Michalon, A, additional, Morando, M, additional, Nappi, E, additional, Navach, F, additional, Norman, P I, additional, Palmeri, A, additional, Pappalardo, G S, additional, Pastir ák, B, additional, Pi út, J, additional, Pi útova, N, additional, Posa, F, additional, Quercigh, E, additional, Riggi, F, additional, Röhrich, D, additional, Romano, G, additional, Safarik, K, additional, ándor, L, additional, Schillings, E, additional, Segato, G, additional, Sené, M, additional, Sené, R, additional, Snoeys, W, additional, Soramel, F, additional, Spyropoulou-Stassinaki, M, additional, Staroba, P, additional, Toulina, T A, additional, Turrisi, R, additional, Tveter, T S, additional, Urbán, J, additional, Valiev, F, additional, Brink, A van den, additional, Ven, P van de, additional, Vyvre, P Vande, additional, Eijndhoven, N van, additional, Hunen, J van, additional, Vascotto, A, additional, Vik, T, additional, Baillie, O Villalobos, additional, Vinogradov, L, additional, Virgili, T, additional, Votruba, M F, additional, Vrláková, J, additional, and Závada, P, additional

Published
2003
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5. Hyperon production in 40 A GeV/c collisions from the NA57 experiment

Author

Collaboration), P I Norman (for the NA57, Antinori, F, Badalà, A, Barbera, R, Belogianni, A, Bhasin, A, Bloodworth, I J, Bruno, G E, Bull, S A, Caliandro, R, Campbell, M, Carena, W, Carrer, N, Clarke, R F, Dainese, A, Haas, A P de, Rijke, P C de, Bari, D Di, Liberto, S Di, Divia, R, Elia, D, Evans, D, Fanebust, K, Fayazzadeh, F, Fedorišin, J, Feofilov, G A, Fini, R A, Ganoti, P, Ghidini, B, Grella, G, Helstrup, H, Henriquez, M, Holme, A K, Jacholkowski, A, Jones, G T, Jovanovic, P, Jusko, A, Kamermans, R, Kinson, J B, and K, K

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. Convergence of an iterative algorithm for solving Hamilton-Jacobi type equations

Author

Markman, Jerry and Katz, I. Norman

Abstract

Solutions of the optimal control and $H_\infty$-control problems for nonlinear affine systems can be found by solving Hamilton-Jacobi equations. However, these first order nonlinear partial differential equations can, in general, not be solved analytically. This paper studies the rate of convergence of an iterative algorithm which solves these equations numerically for points near the origin. It is shown that the procedure converges to the stabilizing solution exponentially with respect to the iteration variable. Illustrative examples are presented which confirm the theoretical rate of convergence.

Published
2002

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