Year: 2016
Type: article
Abstract: Initial partonic eccentricities in $\text{Au}+\text{Au}$ collisions at center-of-mass energy $\sqrt{{s}_{NN}}=200$ GeV are investigated by using a multiphase transport model with a string-melting scenario. The initial eccentricities in different order of harmonics are studied by using participant and cumulant definitions. Eccentricity in terms of second-, fourth- and sixth-order cumulants as a function of number of participant nucleons are compared systematically with the traditional participant definition. The ratio of the cumulant eccentricities $\ensuremath{\varepsilon}{4}/\ensuremath{\varepsilon}{2}$ and $\ensuremath{\varepsilon}{6}/\ensuremath{\varepsilon}{4}$ are studied in comparison with the ratio of the corresponding flow harmonics. The conversion coefficients (${v}_{n}/{\ensuremath{\varepsilon}}_{n}$) are explored up to fourth-order harmonics based on the cumulant method. Furthermore, studies on transverse momentum (${p}_{T}$) and pseudorapidity ($\ensuremath{\eta}$) dependencies of eccentricities and their fluctuations are presented. As in ideal hydrodynamics, initial eccentricities are expected to be closely related to the final flow harmonics in relativistic heavy-ion collisions, studies of the fluctuating initial condition in the AMPT model will shed light on the tomography properties of the initial source geometry.
Source: Physical Review C
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2533712596