用ATLAS探测器测量sqrt（s_nn）= 2.76 TeV的Pb-Pb碰撞中的逐事件流谐波分布
Measurement of the distributions of event-by-event flow harmonics in Pb-Pb Collisions at sqrt(s_nn)=2.76 TeV with the ATLAS detector
摘要：
用ATLAS探测器测量了qrt（snn）= 2.76TeV的Pb-Pb碰撞中n = 2 - 4的谐波流系数v_n的逐事件分布，用的粒子是p_T> 0.5GeV，|η| <2.5。v_2的v_n分布的形状与中心碰撞中的高斯起伏一致，v_3和v_4的分布在测量的中心度范围内与高斯起伏一致。当这些分布被重新标度为具有相同的时，所得到的形状对于p_T> 1 GeV和0.5 <p_T <1 GeV几乎相同。<v_n>并与两种初始几何模型（Glauber模型和MC-KLN模型）的偏心率分布进行了比较。两者都不能在整个中心性范围内一致地描述v_2数据
英文摘要：
The event-by-event distributions of harmonic flow coefficients v_n for n=2-4 are measured in Pb-Pb collisions at sqrt(s_nn)=2.76 TeV with the ATLAS detector, using charged particles with p_T > 0.5 GeV and |η|<2.5. The shape of the v_n distributions is consistent with Gaussian fluctuations in central collisions for v_2 and over the measured centrality range for v_3 and v_4. When these distributions are rescaled to have the same <v_n>, the resulting shapes are nearly the same for p_T>1 GeV and 0.5<p_T<1 GeV. The v_n distributions are compared with the eccentricity distributions from two initial geometry models: Glauber and the MC-KLN model. Both fail to describe the v_2 data consistently over the full centrality range
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