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首页> 外文期刊>Proceedings of the Arkansas Academy of Science >Measuring Strangeness Production From Relativistic Collisions Between Pairs of Nuclei Using a Vertex Time Projection Chamber
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Measuring Strangeness Production From Relativistic Collisions Between Pairs of Nuclei Using a Vertex Time Projection Chamber

机译：使用顶点时间投影室测量成对核之间的相对论碰撞产生的奇异性

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At collider energies of 200A-GeV, tracking of charged particle pairs originating from neutrals is dominated by singly-strange K_s~o decays. Counting the number of secondary vertex pairs is a method of measuring the strangeness production. The VTX is a four-layer micro-strip gas time projection chamber being designed for use with the STAR instrument in an experiment using the Relativistic Heavy Ion Collider under construction at Brookhaven National Laboratory. Simulated pixel data generated from CERN's Monte Carlo detector-modeling program Geant were put into tables using the TAS sorting structures available from the STAR Collaboration. The response of VTX was mapped for charged pion pairs emerging from each secondary vertex resulting from the decay of a neutral kaon. Grouping each set of two charged pions of opposite sign which originate from a vertex distinct from the collider vertex is the method being presented for measuring strangeness production. This method has three steps: (1) removing all charged particles originating directly from the collider vertex using established methods, (2) identifying which ≤ 4 residual pixel tracks in the 4 micro-strip TPC planes belong to which particular individual pion, and (3) grouping these secondary pions into the appropriate pairs. Research presented will concentrate on steps (2) and (3) in identifying each K_s~o in order to measure strangeness production. Backgrounds were generated as part of the simulation process, and to help in the elimination of backgrounds, rough-set analysis was used to fine tune algorithm parameters using exemplars which are available from simulation data in TAS Tables.
机译：在对撞机能量为200A-GeV的情况下，源自中性点的带电粒子对的跟踪主要由奇异的K_s_o衰减决定。计算次要顶点对的数量是一种测量异常产生的方法。 VTX是一种四层微带气体时间投影室，设计用于STAR仪器，用于布鲁克海文国家实验室正在建造的相对论重离子对撞机的实验中。使用STAR Collaboration提供的TAS排序结构，将CERN的Monte Carlo检测器建模程序Geant生成的模拟像素数据放入表格中。 VTX的响应针对因中性kaon的衰减而从每个次级顶点出现的带电介子对进行映射。将来自与碰撞体顶点不同的顶点的两个带相反符号的带电介子的每组进行分组是提出的用于测量怪异产生的方法。该方法包括三个步骤：（1）使用已建立的方法去除所有直接源自对撞机顶点的带电粒子；（2）识别4个微带TPC平面中哪个≤4个残留像素轨迹属于哪个特定个体介子；以及（ 3）将这些次要介子归为适当的对。提出的研究将集中于确定每个K_s_o以测量异常产生的步骤（2）和（3）。在仿真过程中生成了背景，为帮助消除背景，使用粗糙集分析来使用可从TAS表中的仿真数据中获得的示例对算法参数进行微调。

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