Freeze-Out Parameters In Central 158a (Gevpb)-Pb-208+Pbcollisions

M. M. Aggarwal,A. Agnihotri,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,A. Baldine,L. Barabach,C. Barlag,S. Bathe,B. Batiounia,T. Bernier,K. B. Bhalla,V. S. Bhatia,C. Blume,R. Bock,M. Bohne,Z. K. Borocz,D. Bucher,A. Buijs,H. Busching,L. Carlen,V. Chalyshev,S. Chattopadhyay,R. Cherbatchev,T. Chujo,A. Claussen,M. P. Decowski,H. Delagrange,V. Djordjadze,P. Donni,I. Doubovik,S. Dutt,M. R. Dutta Majumdar,K. El Chenawi,S. Eliseev,K. Enosawa,P. Foka,S. Fokin,V. Frolov,M. S. Ganti,S. Garpman,O. Gavrishchuk,F. J. M. Geurts,T. K. Ghosh,R. Glasow,S. K. Gupta,B. Guskov,A. Gustafsson,H. H. Gutbrod,R. Higuchi,I. Hrivnacova,M. Ippolitov,H. Kalechofsky,R. Kamermans,K.-H. Kampert,K. Karadjev,K. Karpio,S. Kees,H. Kim,B. W. Kolb,I. Kosarev,I. Koutcheryaev,T. Krumpel,A. Kugler,P. Kulinich,M. Kurata,K. Kurita,N. Kuzmin,I. Langbein,A. Lebedev,Y. Y. Lee,H. Lohner,L. Luquin,D. P. Mahapatra,V. Manko,M. Martin,G. Mart,A. Maximov,R. Mehdiyev,G. Mgebrichvili,Y. Miake,D. Mikhalev,F. Mir,G. C. Mishra,Y. Miyamoto,D. Morrison, D. S. Mukhopadhyay,V. Myalkovski,H. Naef,B. K. Nandi, S. K. Nayak,T. K. Nayak,S. Neumaier,A. Nianine,V. Nikitine,S. Nikolaev,P. Nilsson,S. Nishimura,P. Nomokonov,J. Nystrand,F. E. Obenshain,A. Oskarsson,I. Otterlund,M. Pachr,A. Parfenov,S. Pavliouk,T. Peitzmann,V. Petracek, F. Plasil,W. Pinganaud,M. L. Purschke,B. Raeven,J. Rak,R. Raniwala, S. Raniwala,V. S. Ramamurthy,N. K. Rao,F. Retiere,K. Reygers,G. Roland,L. Rosselet,I. Roufanov,C. Roy,J. M. Rubio,H. Sako,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. Soderstrom,N. Solomey,S. P. Sørensen,P. Stankus,G. Stefanek,E. Stenlund,D. Stuken,M. Sumbera,T. Svensson,M. D. Trivedi, A. Tsvetkov, L. Tykarski, J. Urbahn,A. Tsvetkov,L. Tykarski,J. Urbahn,E. v. d. Pijll,N. v. Eijndhoven,G. v. Nieuwenhuizen, A. Vinogradov,Y. Viyogi,A. Vodopianov,S. Vörös, B. Wysłouch,K. Yagi,Y. Yokota,G. Young

PHYSICAL REVIEW LETTERS（1999）

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Abstract

Neutral pion production in central 158A GeV Pb-208 + Pb-208 collisions has been studied in the WA98 experiment at the CERN Super Proton Synchrotron. The pi(0) transverse mass spectrum has been analyzed in terms of a thermal model with hydrodynamic expansion. The high accuracy and large kinematic coverage of the measurement allow one to limit previously noted ambiguities in the extracted freeze-out parameters. The results are shown to be sensitive to the shape of the velocity distribution at freeze-out.

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