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arXiv 0901.0693hep-ex
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用STAR中的约化探测材料测量$\sqrt{s_{NN}}$ = 200 GeV的p + p碰撞中的非光子电子

Measurement of Non-photonic Electrons in p + p Collisions at $\sqrt{s_{NN}}$ = 200 GeV with reduced detector material in STAR

F. Jin

摘要:

本文分析了在$\sqrt{s_{NN}}$ = 200 GeV的p+p碰撞中产生pT >0.2GeV/c的中快度非光子电子(NPE)。该数据集是从RHIC 2008年运行中获取的约78 M TOF触发事件。通过对e/π比的测量,我们发现由于没有内跟踪探测器和支撑材料,伽马转换产生的光子背景电子比STAR以前的实验减少了约10倍。信背比的显著增加将使我们能够提高通过半轻子衰变到电子的粲散射截面的提取精度。

英文摘要:

In this paper, we present our analysis of mid-rapidity non-photonic electron (NPE) production at pT >0.2GeV/c in p+p collisions at $\sqrt{s_{NN}}$ = 200 GeV. The dataset is about 78M TOF-triggered events taken from RHIC year 2008 runs. Through the measurement of e/πratio, we find that the photonic background electrons from gamma conversions are reduced by about a factor of 10 compared with those in STAR previous runs due to the absence of inner tracking detectors and the supporting materials. The dramatic increase of signal-to-background ratio will allow us to improve the precision on extracting the charm cross-section via its semi-leptonic decays to electrons.

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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