University of Colorado, Boulder, Colorado 80309, USA.
Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia.
Phys Rev Lett. 2014 Jun 6;112(22):222301. doi: 10.1103/PhysRevLett.112.222301. Epub 2014 Jun 3.
Charged-pion-interferometry measurements were made with respect to the second- and third-order event plane for Au+Au collisions at sqrt[s_{NN}]=200 GeV. A strong azimuthal-angle dependence of the extracted Gaussian-source radii was observed with respect to both the second- and third-order event planes. The results for the second-order dependence indicate that the initial eccentricity is reduced during the medium evolution, which is consistent with previous results. In contrast, the results for the third-order dependence indicate that the initial triangular shape is significantly reduced and potentially reversed by the end of the medium evolution, and that the third-order oscillations are largely dominated by the dynamical effects from triangular flow.
进行了带正电介子干涉测量，相对于 Au+Au 碰撞的第二和第三阶事件平面。对于第二和第三阶事件平面，都观察到了提取的高斯源半径的强烈的方位角依赖性。二阶依赖性的结果表明，在介质演化过程中初始椭圆度减小，这与先前的结果一致。相比之下，三阶依赖性的结果表明，初始三角形形状在介质演化结束时显著减小并可能反转，并且三阶振荡主要由三角形流的动力学效应主导。
