Saturation of azimuthal anisotropy in Au+Au collisions at sNN=62-200GeV

S. S. Adler, S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, A. Al-Jamel, J. Alexander, R. Amirikas, K. Aoki, L. Aphecetche, R. Armendariz, S. H. Aronson, R. Averbeck, T. C. Awes, B. Azmoun, R. Azmoun, V. Babintsev, A. Baldisseri, K. N. Barish, P. D. BarnesB. Bassalleck, S. Bathe, S. Batsouli, V. Baublis, F. Bauer, A. Bazilevsky, S. Belikov, R. Bennett, Y. Berdnikov, S. Bhagavatula, M. T. Bjorndal, J. G. Boissevain, H. Borel, S. Borenstein, K. Boyle, M. L. Brooks, D. S. Brown, N. Bruner, D. Bucher, H. Buesching, V. Bumazhnov, G. Bunce, J. M. Burward-Hoy, S. Butsyk, X. Camard, S. Campbell, J. S. Chai, P. Chand, W. C. Chang, S. Chernichenko, C. Y. Chi, J. Chiba, M. Chiu, I. J. Choi, J. Choi, R. K. Choudhury, T. Chujo, V. Cianciolo, C. R. Cleven, Y. Cobigo, B. A. Cole, M. P. Comets, P. Constantin, M. Csanád, T. Csörgo, D. D'Enterria, T. Dahms, K. Das, G. David, H. Delagrange, A. Denisov, A. Deshpande, E. J. Desmond, A. Devismes, O. Dietzsch, A. Dion, J. L. Drachenberg, O. Drapier, A. Drees, K. A. Drees, A. K. Dubey, R. Du Rietz, A. Durum, D. Dutta, V. Dzhordzhadze, Y. V. Efremenko, J. Egdemir, K. El Chenawi, A. Enokizono, H. En'yo, B. Espagnon, S. Esumi, L. Ewell, D. E. Fields, F. Fleuret, S. L. Fokin, B. Forestier, B. D. Fox, Z. Fraenkel

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Abstract

New measurements are presented for charged hadron azimuthal correlations at midrapidity in Au+Au collisions at sNN=62.4 and 200 GeV. They are compared to earlier measurements obtained at sNN=130GeV and in Pb+Pb collisions at sNN=17.2GeV. Sizeable anisotropies are observed with centrality and transverse momentum (pT) dependence characteristic of elliptic flow (v2). For a broad range of centralities, the observed magnitudes and trends of the differential anisotropy, v2(pT), change very little over the collision energy range sNN=62-200GeV, indicating saturation of the excitation function for v2 at these energies. Such a saturation may be indicative of the dominance of a very soft equation of state for sNN∼60-200GeV.

Original languageEnglish
Article number232302
JournalPhysical Review Letters
Volume94
Issue number23
DOIs
StatePublished - Jun 17 2005

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