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Centrality Dependence of Neutral Pion Production in 158 A GeV P 208 <mml:…

1998; American Physical Society; Volume: 81; Issue: 19 Linguagem: Inglês

10.1103/physrevlett.81.4087

1092-0145

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, E.-M. Bohne, Z. Böröcz, D. Bucher, A. Buijs, H. Büsching, L. Carlén, V. Chalyshev, S. Chattopadhyay, R. Cherbatchev, T. Chujo, A. Claussen, Avijit Das, M. P. Decowski, V. Djordjadze, P. Dönni, I. Doubovik, 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, Tushar K. Ghosh, R. Glasow, S. K. Gupta, B.N. Gus'kov, H.-Å. Gustafsson, H.H. Gutbrod, R. Higuchi, I. Hřivnáčová, M. Ippolitov, H. Kalechofsky, R. Kamermans, K.‐H. Kampert, K. Karadjev, K. Karpio, S. Kato, S. Kees, H. Kim, B. W. Kolb, Ilya Kosarev, I. Koutcheryaev, T. Krümpel, A. Kugler, P. Kulinich, Masanao Kurata, K. Kurita, N. Kuzmin, I. Langbein, A. Lebedev, Y. Y. Lee, H. Löhner, L. Luquin, D. P. Mahapatra, V. Manko, Michel Martin, A. Maximov, R. Mehdiyev, G. Mgebrichvili, Y. Miake, D. Mikhalev, G. C. Mishra, Yusuke 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. Pietzmann, V. Patracek, W. Pinanaud, F. Plasil, M. L. Purschke, B. Raeven, J. Rak, R. Raniwala, S. Raniwala, V.S. Ramamurthy, N.K. Rao, F. Retière, 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, G. Shabratova, I. Sibiriak, T. Siemiarczuk, D. Silvermyr, B. C. Sinha, N. Slavine, K. Söderström, N. Solomey, S. P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, D. Stüken, M. Šumbera, T. Svensson, M. D. Trivedi, A. Tsvetkov, C. Twenhöfel, L. Tykarski, J. Urbahn, N. van Eijndhoven, G. J. van Nieuwenhuizen, А. Виноградов, Y. P. Viyogi, A.S. Vodopianov, Sandrine Voros, B. Wysłouch, K. Yagi, Yuichiro Yokota, G. R. Young,

Quantum Chromodynamics and Particle Interactions

The production of neutral pions in 158AGeV Pb+Pb collisions has been studied in the WA98 experiment at the CERN SPS. Transverse momentum spectra are studied for the range 0.3 GeV/c < mT-m0 < 4.0 GeV/c. The results for central collisions are compared to various models. The centrality dependence of the neutral pion spectral shape and yield is investigated. An invariance of the spectral shape and a simple scaling of the yield with the number of participating nucleons is observed for centralities with greater than about 30 participating nucleons which is most naturally explained by assuming an equilibrated system.