arXiv 1402.60932014-02-25nucl-exnucl-th

用重离子碰撞模型对椭圆流参数的系统研究

Systematic study of the elliptic flow parameter using a heavy-ion collision model

Md. Nasim, Bedangadas Mohanty

备注：: 7 pages, 11 figures
DOI：: 10.1142/S0218301315500275

摘要：

椭圆流参数$v_{2}$被认为是研究重离子碰撞早期动力学的敏感探针。在这项工作中，我们讨论了探测器效率的影响，程序的中心性确定，共振衰减的影响，程序获得事件平面分辨率上测量的$v_{2}$的标准事件平面方法的框架内的传输模型。$v_{2}$的测量值取决于粒子数计数中的探测器效率。中心性确定的影响被发现是可以忽略不计的。对宽中心性面元的同相轴平面分辨率进行逐相轴校正的方法得到的结果更接近于$v_{2}$的真实值。发现共振衰减的影响降低了$π$、$K$和$p$的$v_{2}$。我们还提出了一个程序，以纠正事件偏置效应对$v_{2}$，同时比较最小偏置中心$v_{2}$值为不同的多奇怪强子。最后，我们提出了一个基于模型的确认最近提出的$v_{2}$之间的关系，使用事件平面方法和标量积方法获得的$v_{2}$的真值。

英文摘要：

Elliptic flow parameter, $v_{2}$ is consider as a sensitive probe for early dynamics of the heavy-ion collision. In this work we have discussed the effect of detector efficiency, procedure of centrality determination, effect of resonance decay, procedure to obtain event plane resolution on the measured $v_{2}$ by standard event plane method within the framework of a transport model. The measured value of $v_{2}$ depends on the detector efficiency in particle number counting. The effect of centrality determination is found to be negligible. The method of event-by-event correction of event plane resolution for wide centrality bin yields in results closer to the true value of $v_{2}$. The effect of resonance decay is seen to decrease the $v_{2}$ of $π$, $K$ and $p$. We also propose a procedure to correct for an event bias effect on $v_{2}$ while comparing the minimum bias centrality $v_{2}$ values for different multi-strange hadrons. Finally we have presented a model based confirmation of the recently proposed relation between $v_{2}$ obtained using event plane method and scalar product method to the true value of $v_{2}$.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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英文摘要：

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