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Relative flow fluctuations as a probe of initial state fluctuations
- Source :
- Phys. Rev. C 95, 054910 (2017)
- Publication Year :
- 2017
-
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.<br />Comment: v1: 10 pages, 7 figures. v2: published version. Added predictions of rcBK model in Fig.2. Data tables available in ancillary files
- Subjects :
- Nuclear Theory
High Energy Physics - Phenomenology
Nuclear Experiment
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. C 95, 054910 (2017)
- Publication Type :
- Report
- Accession number :
- edsarx.1702.01730
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevC.95.054910