One-, Two- and Three-Particle Distributions from 158 A GeV/c Central Pb+Pb Collisions

Several hadronic observables have been studied in central 158 A GeV Pb+Pb collisions using data measured by the WA98 experiment at CERN: single negative pion and kaon production, as well as two- and three-pion interferometry. The Wiedemann-Heinz hydrodynamical model has been fitted to the pion spect...

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Detalles Bibliográficos
Autores principales: Aggarwal, M M, Angelis, A L S, Antonenko, V G, Arefev, V, Astakhov, V A, Avdeichikov, V, Awes, T C, Baba, P V K S, Badyal, S K, Bathe, S, Batyunya, B, Bernier, T, Bhalla, K B, Bhatia, V S, Blume, C, Bucher, D, Büsching, H, Carlén, L, Chattopadhyay, S, Decowski, M P, Delagrange, H, Dönni, P, Dutta-Majumdar, M R, El-Chenawi, K F, Enosawa, K, Fokin, S, Frolov, V, Ganti, M S, Garpman, S, Gavrishchuk, O P, Geurts, F J M, Ghosh, T K, Glasow, R, Guskov, B, Gustafsson, Hans Åke, Gutbrod, H H, Hrivnacova, I, Ippolitov, M S, Kalechofsky, H, Kamermans, R, Karadzhev, K, Karpio, K, Kolb, B W, Kosarev, I, Kucheryaev, I, Kugler, A, Kulinich, P, Kurata, M, Lebedev, A, Löhner, H, Mahapatra, D P, Man'ko, V, Martin, M, Martínez, G, Maksimov, A, Miake, Y, Mishra, G C, Mohanty, B, Mora, M J, Morrison, D, Mukhanova, T, Mukhopadhyay, D S, Naef, H, Nandi, B K, Nayak, S K, Nayak, T K, Nyanin, A, Nikitin, V, Nikolaev, S, Nilsson, P, Nishimura, S, Nomokonov, V P, Nystrand, J, Oskarsson, A, Otterlund, I, Peitzmann, T, Peressounko, D Yu, Petracek, V, Plasil, F, Purschke, M L, Rak, J, Raniwala, R, Raniwala, S, Rao, N K, Reygers, K, Roland, G, Rosselet, L, Rufanov, I, Rubio, J M, Sambyal, S S, Santo, R, Sato, S, Schlagheck, H, Schmidt, H R, Schutz, Y, Shabratova, G, Shah, T H, Sibiryak, Yu, Siemiarczuk, T, Silvermyr, D, Sinha, B C, Slavin, N V, Söderström, K, Sood, G, Sørensen, S P, Stankus, P, Stefanek, G, Steinberg, P, Stenlund, E, Sumbera, M, Svensson, T, Tsvetkov, A, Tykarski, L, Van den Pijll, E C, van Eijndhoven, N, van Nieuwenhuizen, G J, Vinogradov, A, Viyogi, Y P, Vodopyanov, A S, Vörös, S, Wyslouch, B, Young, G R
Lenguaje:eng
Publicado: 2002
Materias:
Nuclear Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevC.67.014906
http://cds.cern.ch/record/584202
Descripción
Sumario:Several hadronic observables have been studied in central 158 A GeV Pb+Pb collisions using data measured by the WA98 experiment at CERN: single negative pion and kaon production, as well as two- and three-pion interferometry. The Wiedemann-Heinz hydrodynamical model has been fitted to the pion spectrum, giving an estimate of the temperature and transverse flow velocity. Bose-Einstein correlations between two identified negative pions have been analysed as a function of kT, using two different parameterizations. The results indicate that the source does not have a strictly boost invariant expansion or spend time in a long-lived intermediate phase. A comparison between data and a hydrodynamical based simulation shows very good agreement for the radii parameters as a function of kT. The pion phase-space density at freeze-out has been measured and agrees well with the Tomasik-Heinz model. A large pion chemical potential close to the condensation limit of the pion mass seems to be excluded. The three-pion Bose-Einstein interferometry shows a substantial contribution of the genuine three-pion correlation, but not quite as large as expected for a fully chaotic and symmetric source.

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