/ Experiment-Nucl nucl-ex/0607018


Pion Freeze-Out Time in Pb+Pb Collisions at 158-A-GeV/c Studied via pi-/pi+ and K-/K+ Ratios


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

Published in: Eur.Phys.J.
Year: 2006
Vol.: C48
Page No: 343-352
Pages: 9

Abstract: The effect of the final state Coulomb interaction on particles produced in Pb+Pb collisions at 158 A GeV/c has been investigated in the WA98 experiment through the study of the pi-/pi+ and K-/K+ ratios measured as a function of transverse mass. While the ratio for kaons shows no significant transverse mass dependence, the pi-/pi+ ratio is enhanced at small transverse mass 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 pi-/pi+ 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.

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