Pion freeze-out time in Pb+Pb collisions at 158 AGeV/c studied via π - /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. Chattopadhyay,M.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. 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,D.P. Mahapatra,V. Manko,M. Martin,G. Martínez,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. Sørensen,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. Wysłouch,G.R. Young

EUROPEAN PHYSICAL JOURNAL C（2006）

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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 - /π + and K - /K + ratios measured as a function of m T -m 0 . While the ratio for kaons shows no significant m T dependence, the π - /π + ratio is enhanced at small m T -m 0 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 - /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.

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Key words

Coulomb Interaction,Transverse Mass,Centrality Interval,NA44 Collaboration,WA98 Collaboration

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