Suppression of High-pTNeutral Pion Production in CentralPb+PbCollisions atsN…

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, C. Baumann, T. Bernier, K. B. Bhalla, V. S. Bhatia, C. Blume, D. Bucher, H. Buesching, L. Carlèn, S. Chattopadhyay, M. P. Decowski, H. Delagrange, P. Dönni,M.R. Dutta Majumdar,K. El Chenawi,A. K. Dubey, K. Enosawa, S. Fokin,В. Фролов, M. S. Ganti, S. Garpman, O. Gavrishchuk,F. J. M. Geurts, Tarun Kanti Ghosh, R. Glasow, B.N. Gus'kov, H. Å. Gustafsson, H.H. Gutbrod, I. Hřivnáčová,M. Ippolitov, H. Kalechofsky, R. Kamermans, K. Karadjev, K. Karpio, B. Kolb, I. Kosarev, I. Koutcheryaev, А. Куглер,P. Kulinich,M. Kurata,A. Lebedev, H. Loehner, L. Luquin, D. P. Mahapatra, V. Manko,Michel Martin,G. Martı́nez, A. Maximov, Y. Miake, G. C. Mishra, B. Mohanty, M. J. Mora,D. P. Morrison, T. Mukhanova, D. Mukhopadhyay, H. Naef,B. K. Nandi, S. K. Nayak, T. K. Nayak, A. Nianine, V. Nikitine, С. Н. Николаев, P. Nilsson, S. Nishimura, P. Nomokonov, J. Nystrand, A. Öskarsson, I. Otterlund, S. Pavliouk, T. Peitzmann,D. Yu. Peressounko, V. Petráček, S. C. Phatak, W. Pinganaud, F. Plášil, M. L. Purschke, J. Rak, M. Rammler, R. Raniwala, S. Raniwala, N. Kameswara Rao, F. Retière, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, C. Roy, J. M. Rubio, S. Sambyal, R. Santo, Susumu Sato, H. Schlagheck, H. R. Schmidt, Y. Schütz, G. Shabratova, T. H. Shah, I. Sibiriak, T. Siemiarczuk, D. Silvermyr, Bikash Sinha, N. Slavine, K. Soederstroem, G. Sood, S. P. Sørensen, P. W. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, M. Šumbera, Tomas Svensson, A. Tsvetkov, L. Tykarski, E. C. v. d. Pijll, N.v. Eijndhoven, G. J. van Nieuwenhuizen, A. Vinogradov, Y. P. Viyogi, A. Vodopianov, S. Voeroes, Bolesław Wysłouch, G. R. Young

Physical Review Letters（2008）

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摘要

Neutral pion transverse momentum spectra were measured in p+C and p+Pb collisions at sNN=17.4 GeV at midrapidity (2.3≲ηlab≲3.0) over the range 0.7≲pT≲3.5 GeV/c. The spectra are compared to π0 spectra measured in Pb+Pb collisions at sNN=17.3 GeV in the same experiment. For a wide range of Pb+Pb centralities (Npart≲300), the yield of π0’s with pT≳2 GeV/c is larger than or consistent with the p+C or p+Pb yields scaled with the number of nucleon-nucleon collisions (Ncoll), while for central Pb+Pb collisions with Npart≳350, the π0 yield is suppressed.Received 21 August 2007DOI:https://doi.org/10.1103/PhysRevLett.100.242301©2008 American Physical Society

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