标题： 能量和系统大小对带电粒子椭圆流及$v_2/\eps$缩放的影响 显示英文标题

标题： Energy and system size dependence of charged particle elliptic flow and $v_2/\eps$ scaling

摘要： 我们报告了在 $\sqrt{s_{_{NN}}}=62$ 和 200 GeV 能量下，金-金和铜-铜碰撞中，在中间快速度区域的带电粒子椭圆流 %($v_2$) 的测量结果。 利用主 STAR TPC 和前向 TPC 之间的相关性，可以最大限度地减少非流效应带来的偏差。 我们进一步研究了流涨落对 $v_2/\eps$ 缩放的影响，研究了蒙特卡罗 Glauber 模型中初始几何偏心率涨落，这与 STAR 对椭圆流涨落的直接测量结果一致。 发现考虑流涨落的影响改善了 $v_2/\eps$ 缩放。 显示英文摘要

摘要： We report measurements of charged particle elliptic flow %($v_2$) at mid-rapidity in Au+Au and Cu+Cu collisions at $\sqrt{s_{_{NN}}}=62$ and 200 GeV. Using correlations between main STAR TPC and Forward TPCs ensures minimal bias due to non-flow effects. We further investigate the effect of flow fluctuations on $v_2/\eps$ scaling studying initial geometry eccentricity fluctuations in Monte-Carlo Glauber model, consistent with STAR direct measurements of elliptic flow fluctuations. It is found that accounting for the effect of flow fluctuations improves $v_2/\eps$ scaling.