Eccentricities, fluctuations and A-dependence of elliptic and triangular flows in heavy-ion collisionsстатьяИсследовательская статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 15 сентября 2021 г.
Аннотация:A simple geometrical model with event-by-event fluctuations is suggested to study elliptical and triangular eccentricities in the initial state of relativistic heavy-ion collisions. This model describes rather well the ALICE and ATLAS data for Pb + Pb collisions at center-of-mass energy $\sqrt{{s}_{NN}}=5.02$ TeV per nucleon pair, assuming that the second, v2, and third, v3, harmonics of the anisotropic flow are simply linearly proportional to the eccentricities ɛ2 and ɛ3, respectively. We show that the eccentricity ɛ3 has a pure fluctuation origin and is substantially dependent on the size of the overlap area only, while the eccentricity ɛ2 is mainly related to the average collision geometry. Elliptic flow, therefore, is weakly dependent on the event-by-event fluctuations everywhere except of the very central collisions 0%–2%, whereas triangular flow is mostly determined by the fluctuations. The scaling dependence of the magnitude of the flow harmonics on atomic number, vn ∝ A−1/3, is predicted for this centrality interval.