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Article
Report number nucl-ex/0406022
Title Azimuthal anisotropy of photon and charged particle emission in Pb-208 + Pb-208 collisions at 158-A-GeV/c
Related titlePB + PB
Azimuthal Anisotropy of Photon and Charged Particle Emission in Pb+Pb Collisions at 158 A GeV/c
Author(s)

Aggarwal, M.M. ; Ahammed, Z. ; Angelis, A.L.S. ; Antonenko, V. ; Areev, V. ; Astakhov, V. ; Avdeitchikov, V. ; Awes, T.C. ; Baba, P.V.K.S. ; Badyal, S.K. ; Bathe, S. ; Batiounia, B. ; Bernier, T. ; Bhatia, V.S. ; Blume, C. ; Bucher, D. ; Busching, H. ; Carlen, L. ; Chattopadhyay, S. ; Decowski, M.P. ; Delagrange, H. ; Donni, P. ; Dutta Majumdar, M.R. ; Dubey, A.K. ; El Chenawi, K. ; Enosawa, K. ; Fokin, S. ; Frolov, V. ; Ganti, M.S. ; Garpman, S. ; Gavrishchuk, O. ; Geurts, F.J.M. ; Ghosh, T.K. ; Glasow, R. ; Guskov, B. ; Gustafsson, H.A. ; Gutbrod, H.H. ; Hrivnacova, I. ; Ippolitov, M. ; Kalechofsky, H. ; Karadjev, K. ; Karpio, K. ; Kolb, B.W. ; Kosarev, I. ; Koutcheryaev, I. ; Kugler, A. ; Kulinich, P. ; Kurata, M. ; Lebedev, A. ; Lohner, H. ; Luquin, L. ; Mahapatra, D.P. ; Manko, V. ; Martin, M. ; Martinez, G. ; Maximov, A. ; Miake, Y. ; Mishra, G.C. ; Mohanty, B. ; Mora, M.-J. ; Morrison, D. ; Moukhanova, T. ; Mukhopadhyay, D.S. ; Naef, H. ; Nandi, B.K. ; Nayak, S.K. ; Nayak, T.K. ; Nianine, A. ; Nikitine, V. ; Nikolaev, S. ; Nilsson, P. ; Nishimura, S. ; Nomokonov, P. ; Nystrand, J. ; Oskarsson, A. ; Otterlund, I. ; Peitzmann, T. ; Peressounko, D. ; Petracek, V. ; Phatak, S.C. ; Pinganaud, W. ; Plasil, F. ; Purschke, M.L. ; Rak, J. ; Raniwala, R. ; Raniwala, S. ; Rao, N.K. ; Retiere, F. ; Reygers, K. ; Roland, G. ; Rosselet, L. ; Roufanov, I. ; Roy, C. ; Rubio, J.M. ; Sambyal, S.S. ; Santo, R. ; Sato, S. ; Schlagheck, H. ; Schmidt, H.-R. ; Schutz, Y. ; Shabratova, G. ; Shah, T.H. ; Sibiriak, I. ; Siemiarczuk, T. ; Silvermyr, D. ; Sinha, B.C. ; Slavine, N. ; Soderstrom, K. ; Sood, G. ; Sorensen, S.P. ; Stankus, P. ; Stefanek, G. ; Steinberg, P. ; Stenlund, E. ; Sumbera, M. ; Svensson, T. ; Tsvetkov, A. ; Tykarski, L. ; van der Pijll, E.C. ; van Eijndhoven, N. ; van Nieuwenhuizen, G.J. ; Vinogradov, A. ; Viyogi, Y.P. ; Vodopianov, A.S. ; Voros, S. ; Wyslouch, B. ; Young, G.R.

Publication 2005
Imprint 2004-06
Number of pages 10
Note 8 pages and 6 figures. The manuscript has undergone a major revision. The unwanted correlations were enhanced in the random subdivision method used in the earlier version. The present version uses the more established method of division into subevents separated in rapidity to minimise short range correlations. The observed results for charged particles are in agreement with results from the other experiments. The observed anisotropy in photons is explained using flow results of pions and the correlations arising due to the decay of the neutral pions
In: Eur. Phys. J. C 41 (2005) 287-296
DOI 10.1140/epjc/s2005-02249-2
Subject category Nuclear Physics - Experiment
Accelerator/Facility, Experiment CERN SPS ; WA98
Abstract The azimuthal distributions of photons and charged particles with respect to the event plane are investigated as a function of centrality in Pb + Pb collisions at 158 A GeV/c in the WA98 experiment at the CERN SPS. The anisotropy of the azimuthal distributions is characterized using a Fourier analysis. For both the photon and charged particle distributions the first two Fourier coefficients are observed to decrease with increasing centrality. The observed anisotropies of the photon distributions compare well with the expectations from the charged particle measurements for all centralities.
Copyright/License publication: © 2005-2025 Springer-Verlag / Societa Italiana di Fisica



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