Measurement of event-by-event flow harmonics in Pb-Pb Collisions at root s(NN)=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 AbouZeid, O. S. and Abramowicz, H. and Abreu, H. and Acharya, B. S. and Adamczyk, L. and Adams, D. L. and Addy, T. N. and Adelman, J. and Adomeit, S. and Adye, T. and Aefsky, S. and Aguilar-Saavedra, J. A. and Agustoni, M. and Aharrouche, M. and Ahlen, S. P. and Ahmad, A. and Ahsan, M. and Aielli, G. and Akdogan, T. and Åkesson, T. P. A. and Krasznahorkay, Attila and Pásztor, Gabriella and Tóth, József (2013) Measurement of event-by-event flow harmonics in Pb-Pb Collisions at root s(NN)=2.76 TeV with the ATLAS detector. NUCLEAR PHYSICS A, 904-90. 421C-424C. ISSN 0375-9474

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Abstract

The event-by-event distributions of harmonic flow coefficients vn for n=2–4 are measured in Pb-Pb collisions at √ sNN = 2.76 TeV with the ATLAS detector, using charged particles with pT > 0.5 GeV and |η| < 2.5. The shape of the vn distributions is consistent with Gaussian fluctuations in central collisions for v2 and over the measured centrality range for v3 and v4. When these distributions are rescaled to have the same hvni, the resulting shapes are nearly the same for pT > 1 GeV and 0.5 < pT < 1 GeV. The vn distributions are compared with the eccentricity distributions from two initial geometry models: Glauber and the MC-KLN model. Both fail to describe the v2 data consistently over the full centrality range.

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