Pion freeze-out time in Pb+Pb collisions at 158 AGeV/c studied via π-+ and K-/K+ ratios

M. M. Aggarwal, Z. Ahammed, A. L S Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T. C. Awes, P. V K S Baba, S. K. Badyal, S. Bathe, B. Batiounia, T. Bernier, K. B. Bhalla, V. S. Bhatia, C. Blume, D. Bucher, H. Büsching, L. Carlen, S. ChattopadhyayM. P. Decowski, H. Delagrange, P. Donni, M. R. Dutta Majumdar, K. El Chenawi, A. K. Dubey, K. Enosawa, S. Fokin, V. Frolov, M. S. Ganti, S. Garpman, O. Gavrishchuk, F. J M Geurts, T. K. Ghosh, R. Glasow, B. Guskov, H. A. Gustafsson, H. H. Gutbrod, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, R. Kamermans, K. Karadjev, K. Karpio, B. W. Kolb, I. Kosarev, I. Koutcheryaev, A. Kugler, P. Kulinich, M. Kurata, A. Lebedev, H. Löhner, L. Luquin, D. P. Mahapatra, V. Manko, M. Martin, G. Martinez, A. Maximov, Y. Miake, G. C. Mishra, B. Mohanty, M. J. Mora, D. Morrison, T. Mukhanova, D. S. Mukhopadhyay, H. Naef, B. K. Nandi, S. K. Nayak, T. K. Nayak, A. Nianine, V. Nikitine, S. Nikolaev, P. Nilsson, S. Nishimura, P. Nomokonov, J. Nystrand, A. Oskarsson, I. Otterlund, S. Pavliouk, T. Peitzmann, D. Peressounko, V. Petracek, S. C. Phatak, W. Pinganaud, F. Plasil, M. L. Purschke, J. Rak, R. Raniwala, S. Raniwala, N. K. Rao, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, C. Roy, J. M. Rubio, S. S. Sambyal, R. Santo, S. Sato, H. Schlagheck, H. R. Schmidt, Y. Schutz, G. Shabratova, T. H. Shah, I. Sibiriak, T. Siemiarczuk, D. Silvermyr, B. C. Sinha, N. Slavine, K. Söderström, G. Sood, S. P. Sorensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, M. Sumbera, T. Svensson, A. Tsvetkov, L. Tykarski, E. C V D Pijll, N. V. Eijndhoven, G. J V Nieuwenhuizen, A. Vinogradov, Y. P. Viyogi, A. Vodopianov, S. Vörös, B. Wyslouch, G. R. Young

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2 Scopus citations

Abstract

The effect of the final state Coulomb interaction on particles produced in Pb+Pb collisions at 158∈AGeV/c has been investigated in the WA98 experiment through the study of the π-+ and K -/K+ ratios measured as a function of mT-m 0. While the ratio for kaons shows no significant mT dependence, the π-+ ratio is enhanced at small mT-m0 values with an enhancement that increases with centrality. A silicon pad detector located near the target is used to estimate the contribution of hyperon decays to the π-+ ratio. The comparison of results with predictions of the RQMD model in which the Coulomb interaction has been incorporated allows to place constraints on the time of the pion freeze-out.

Original languageEnglish (US)
Pages (from-to)343-352
Number of pages10
JournalEuropean Physical Journal C
Volume48
Issue number2
DOIs
StatePublished - Nov 2006

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

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