利用电子标记对开粲介子的拓扑重构
Topological reconstruction of open charm mesons using electron tagging
摘要:
本文首次用电子标记方法研究了$\snn$ = 200 GeV的p+p碰撞中开粲介子的拓扑重构.该分析利用了在运行VI数据采集期间STAR电磁量热计的完全验收。获得清晰的D $^0$信号,其显著的信号背景比为约1/7,信号显著性为约4。与开粲介子相关的次领先电子的方位角关联分布呈现双峰结构。我们发现了第一个瞬发粲介子对产生的迹象。这种相关技术可以详细测量重离子碰撞中开粲介子的能量损失。
英文摘要:
We present first results on the topological reconstruction of open charm mesons in p+p collisions at $\snn$ = 200 GeV using electron tagging. The analysis makes use of the full acceptance of the STAR electromagnetic calorimeter during Run VI data taking. A clear D$^0$ signal is obtained with a remarkable signal-to-background ratio of about 1/7 and a signal significance of about 4. The azimuthal correlation distribution of the subleading electrons associated with open charm mesons exhibits a two-peak structure. We found first indications for prompt charm meson pair production. This correlation technique allows detailed energy loss measurements of open charm mesons in heavy-ion collisions.
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