Transverse mass distributions of neutral pions from 208 Pb-induced reactions at 158 · A GeV WA 98 Collaboration

Madan Mohan Aggarwal, A. L. S. Angelis,V. G. Antonenko,V. Arefiev,V. Astakhov,V. Avdeitchikov,Terry C Awes,P.V.K.S. Baba,S. K. Badyal,Stefan Bathe, B. Batiounia, T. Bernier, K. B. Bhalla,V. S. Bhatia,Christoph Blume,D. Bucher, Henner Buesching,Lars Carlén,Sukalyan Chattopadhyay,M. P. Decowski, Hugues Delagrange,P. Donni,M. R. Dutta Majumdar,K. El Chenawi, K. Enosawa,Sergey Fokin,Valery Frolov,M. S. Ganti, Sten Garpman, O. P. Gavrishchuk,F. J. M. Geurts, Tilak Kumar Ghosh,R. Glasow, B. N. Gus'kov,H. Å. Gustafsson, H. H. Gutbrod,I. Hrivnacova,Mikhail Ippolitov, H. Kalechofsky,R. Kamermans, K. Karadjev,Krzysztof Karpio, Bradley Kolb, I. G. Kosarev, I. Koutcheryaev,Andrej Kugler, P. Kulinich, M. Kurata, A. Lebedev,Herbert Löhner,Durga Prasad Mahapatra,Vladislav Manko,Mv Manzano Martin,German Martinez,A. N. Maximov,Yasuo Miake,G. C. Mishra,Bedangadas Mohanty,M J Merizalde Mora,D. P. Morrison, T. Mukhanova, D. S. Mukhopadhyay,Henry Naef, Basanta Kumar Nandi,S. K. Nayak,Tapan K. Nayak,A. Nianine, V. Nikitine,Sergey Nikolaev,Paul Nilsson, Shuji Nishimura, P. Nomokonov, Joakim Nystrand,A. Oskarsson, Ingvar Otterlund,Thomas Peitzmann,Dmitri Peressounko, Vojtěch Petráček, Franz Plasil,Martin L. Purschke,Jan Rak,Rashmi Raniwala, Sudhir Raniwala,Nsv Kameswara Rao, Klaus Reygers,Gunther Roland, Laurent Rosselet,Igor Roufanov, J. M. Rubio,Sanjeev Singh Sambyal, Rainer Santo,Shingo Sato, H. Schlagheck, H.-R. Schmidt,Yves Schutz,Galina Shabratova, T. H. Shah, I. G. Sibiriak,Teodor Siemiarczuk, David Olle Rickard Silvermyr,Bikash Sinha, N. Slavine,K. Söderström,Gunjan Sood,S. P. Sørensen, P. W. Stankus, Grzegorz Stefanek,Peter Steinberg, Evert Stenlund, Michal Šumbera,T. Svensson, A. A. Tsvetkov, L. Tykarski, E. C. van der Pijll, Nick van Eijndhoven, G. J. v. Nieuwenhuizen,Alexander Vinogradov,Yogendra Pathak Viyogi,Alexander Vodopianov,S. Voeroes, Bolek Wyslouch, Glenn Reid Young

msra（2001）

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摘要

Results on transverse mass spectra of neutral pions measured at central rapidity are presented for impact parameter selected 158·A GeV Pb + Pb, and Pb + Nb collisions. The distributions cover the range 0.5 GeV/c ≤ mT − m0 ≤ 4 GeV/c . The change of the spectral shape with centrality is studied in detail. In going from peripheral to medium central collisions there is a nuclear enhancement increasing with transverse mass similar to the well known Cronin effect, while for very central collisions this enhancement appears to be weaker than expected. PACS. 25.75.Dw Particle and resonance production 2 M.M. Aggarwal et al.: Transverse mass distributions of neutral pions from Pb-induced reactions at 158·A GeV

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