Observation of anisotropic event shapes and transverse flow in ultrarelativistic Au + Au collisions

J. Barrette, R. Bellwied, S. Bennett, P. Braun-Munzinger, W. E. Cleland, M. Clemen, J. Cole, T. M. Cormier, G. David, J. Dee, O. Dietzsch, M. Drigert, S. Gilbert, J. R. Hall, T. K. Hemmick, N. Herrmann, B. Hong, C. L. Jiang, Y. Kwon, R. LacasseA. Lukaszew, Q. Li, T. W. Ludlam, S. McCorkle, S. K. Mark, R. Matheus, E. O'Brien, S. Panitkin, T. Piazza, C. Pruneau, M. N. Rao, M. Rosati, N. C. DaSilva, S. Sedykh, U. Sonnadara, J. Stachel, H. Takai, E. M. Takagui, S. Voloshin, G. Wang, J. P. Wessels, C. L. Woody, N. Xu, Z. Zhang, Y. Zhang, C. Zou

Research output: Contribution to journalArticlepeer-review

173 Citations (Scopus)


Event shapes for Au + Au collisions at 11.4 GeV/c per nucleon were studied over nearly the full solid angle with the E877 apparatus. The analysis was performed by Fourier expansion of azimuthal distributions of the transverse energy (ET) measured in different pseudorapidity intervals. For semicentral collisions a pronounced event anisotropy is identified with a clear forward-backward anticorrelation. In the forward pseudorapidity interval up to 9% of the ET is in a directed component. The signal decreases for peripheral and very central collisions.

Original languageEnglish
Pages (from-to)2532-2535
Number of pages4
JournalPhysical review letters
Issue number19
Publication statusPublished - 1994
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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