Measurement of Event Plane Correlations in Pb-Pb Collisions at √ sNN=2.76 TeV with the ATLAS Detector

Jia, J. Y. 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 Event Plane Correlations in Pb-Pb Collisions at √ sNN=2.76 TeV with the ATLAS Detector. NUCLEAR PHYSICS A, 910. pp. 276-280. ISSN 0375-9474

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Abstract

A measurement of correlations between event-plane angles Φn is presented as a function of centrality for PbPb collisions at √ sNN = 2.76 TeV. These correlations are estimated from observed event-plane angles Ψn obtained from charged particle or transverse energy flow measured over a large pseudorapidity range |η| < 4.8, followed by a resolution correction that accounts for the dispersion of Ψn relative to Φn. Various correlators involving two or three event planes with acceptable resolution are measured. Significant positive correlations are observed for 4(Φ2 − Φ4), 6(Φ2 − Φ6), 6(Φ3 − Φ6), 2Φ2 + 3Φ3 − 5Φ5, 2Φ2 + 4Φ4 − 6Φ6 and −10Φ2 + 4Φ4 + 6Φ6. However, the measured correlations for 2Φ2 − 6Φ3 + 4Φ4 are negative. These results may shed light on the patterns of the fluctuation of the created matter in the initial state as well as the subsequent hydrodynamic evolution.

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