Measurement of vn coefficients and event plane correlations in 2.76 TeV Pb-Pb collisions with ATLAS

Mohapatra, S. and Aad, G. and Abajyan, T. and Abbott, B. and Abdallah, J. and Abdel, Khalek S. and Abdelalim, A. A. and Abdinov, O. and Aben, R. and Abi, B. and Abolins, M. and AbouZeid, O. S. and Abramowicz, H. and Abreu, H. and Acerbi, E. and Acharya, B. S. and Adamczyk, L. and Adams, D. L. and Addy, T. N. and Adelman, J. and Adomeit, S. and Adragna, P. and Adye, T. and Aefsky, S. and Aguilar-Saavedra, J. A. and Agustoni, M. and Aharrouche, M. and Ahlen, S. P. and Ahles, F. and Ahmad, A. and Krasznahorkay, Attila and Pásztor, Gabriella and Tóth, József (2013) Measurement of vn coefficients and event plane correlations in 2.76 TeV Pb-Pb collisions with ATLAS. NUCLEAR PHYSICS A, 910-91. pp. 75-82. ISSN 0375-9474

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Abstract

Measurements of flow harmonics v1 −v6 are presented in a broad range of transverse momentum and centrality for √ sNN = 2.76 TeV Pb-Pb collisions with the ATLAS experiment. The fourier coefficients of two-particle correlations are shown to factorize as products of the single particle vn for n = 2 − 6. The factorization breaks for n = 1 due to effects of global momentum conservation. The dipolar v1 associated with the initial dipole asymmetry is extracted from the two-particle correlations via a two component fit that accounts for momentum conservation. The magnitude of the extracted dipolar v1 is comparable to v3. Measurements of correlations between harmonic planes of different orders, which give additional constraints on the initial geometry and expansion mechanism of the medium produced in the heavy ion collisions, are also presented.

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