Event shape engineering with ALICE

Dobrin, A. F. and Abelev, B. and Adam, J. and Adamová, D. and Adare, A. M. and Aggarwal, M. M. and Aglieri, R. G. and Agócs, András and Agostinelli, A. and Aguilar, S. S. and Ahammed, Z. and Ahmad, A. and Ahmad, N. and Ahn, S. A. and Ahn, S. U. and Akindinov, A. and Aleksandrov, D. and Alessandro, B. and Alfaro, M. J. R. and Alici, A. and Alkin, A. and Alme, J. and Alt, T. and Altini, V. and Altinpinar, S. and Altsybeev, I. and Andrei, C. and Andronic, A. and Anguelov, V. and Anielski, J. and Barnaföldi, Gergely Gábor and Bencédi, Gyula and Berényi, Dániel and Boldizsár, László and Dénes, Ervin and Hamar, Gergő and Lévai, Péter and Pochybova, Sona (2013) Event shape engineering with ALICE. NUCLEAR PHYSICS A, 904-90. 455C-458C. ISSN 0375-9474

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Abstract

The strong fluctuations in the initial energy density of heavy-ion collisions allow an efficient selection of events corresponding to a specific initial geometry. For such “shape engineered events”, the elliptic flow coefficient, v2, of unidentified charged particles, pions and (anti-)protons in Pb-Pb collisions at √ sNN = 2.76 TeV is measured by the ALICE collaboration. v2 obtained with the event plane method at mid-rapidity, |η| < 0.8, is reported for different collision centralities as a function of transverse momentum, pT, out to pT = 20 GeV/c. The measured v2 for the shape engineered events is significantly larger or smaller than the average which demonstrates the ability to experimentally select events with the desired shape of the initial spatial asymmetry.

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