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Pion Freeze-Out Time in Pb+Pb Collisions at 158 A GeV/c Studied via $\pi^-/\pi^+$ 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 1 K.B. Bhalla V.S. Bhatia C. Blume D. Bucher H. Büsching L. Carlen S. Chattopadhyay M.P. Decowski H. Delagrange 1 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. Å.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 1 D.P. Mahapatra V. Manko M. Martin Gines Martinez Garcia 1 A. Maximov Y. Miake G.C. Mishra B. Mohanty M.-J. Mora 1 D. Morrison T. Mukhanova D.S. Mukhopadhyay H. Naef B.K. Nandi S.K. Nayak 1 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 1 F. Plasil M.L. Purschke J. Rak R. Raniwala S. Raniwala N.K. Rao F. Retiere 1 K. Reygers G. Roland L. Rosselet I. Roufanov C. Roy 1 J.M. Rubio S.S. Sambyal R. Santo S. Sato H. Schlagheck H.-R. Schmidt Y. Schutz 1 G. Shabratova T.H. Shah I. Sibiriak T. Siemiarczuk 1 D. Silvermyr B.C. Sinha N. Slavine K. Söderström G. Sood S.P. Sørensen P. Stankus G. Stefanek 1 P. Steinberg E. Stenlund M. Sumbera T. Svensson A. Tsvetkov L. Tykarski 1 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
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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M.M. Aggarwal, Z. Ahammed, A.L.S. Angelis, V. Antonenko, V. Arefiev, et al.. Pion Freeze-Out Time in Pb+Pb Collisions at 158 A GeV/c Studied via $\pi^-/\pi^+$ and $K^-/K^+$ Ratios. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2006, 48, pp.343-352. ⟨10.1140/epjc/s10052-006-0081-x⟩. ⟨in2p3-00238256⟩

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