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Journal Articles Physical Review C Year : 2017

Relative flow fluctuations as a probe of initial state fluctuations

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Abstract

Elliptic flow, $v_2$, and triangular flow, $v_3$, are to a good approximation linearly proportional to the corresponding spatial anisotropies of the initial density profile, $\varepsilon_2$ and $\varepsilon_3$. Using event-by-event hydrodynamic simulations, we point out when deviations from this linear scaling are to be expected. When these deviations are negligible, relative $v_n$ fluctuations are equal to relative $\varepsilon_n$ fluctuations, and one can directly probe models of initial conditions using ratios of cumulants, for instance $v_n\{4\}/v_n\{2\}$. We argue that existing models of initial conditions tend to overestimate flow fluctuations in central Pb+Pb collisions, and to underestimate them in peripheral collisions. We make predictions for $v_3\{6\}$ in noncentral Pb+Pb collisions, and for $v_3\{4\}$ and $v_3\{6\}$ in high-multiplicity p+Pb collisions.
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Dates and versions

cea-01472192 , version 1 (20-02-2017)

Licence

Attribution - CC BY 4.0

Identifiers

Cite

Giuliano Giacalone, Jacquelyn Noronha-Hostler, Jean-Yves Ollitrault. Relative flow fluctuations as a probe of initial state fluctuations. Physical Review C, 2017, 95, pp.054910. ⟨10.1103/PhysRevC.95.054910⟩. ⟨cea-01472192⟩
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