STAR内跟踪升级-性能研究
STAR inner tracking upgrade - A performance study
摘要：
各向异性流动测量表明在RHIC的$200\mathrm{GeV}$ Au+Au碰撞中部分子集体的发展。为了理解部分子状态方程，必须解决热化问题。重味夸克（c，b）的集体运动可以用来指示轻味夸克（u，d，s）热化的程度。重味夸克集体性的测量需要直接重建低$\pt$区的重味强子。对高$\pt$的开粲谱测量可以用来研究重夸克的能量损失和介质性质。重味追踪器（HFT）是一个拟议中的中快度STAR实验的升级，它将通过重建它们移位的衰变顶点来测量开魅强子的$v_{2}$到非常低的$\pt$。HFT最里面的部分是PIXEL探测器（由两个低质量单片有源像素传感器层组成），它可以在碰撞顶点附近提供高精度的位置测量。中间硅跟踪器（IST）是一种单层条带探测器，在RHIC-II全亮度下运行时，它对提高PIXEL探测器的命中识别至关重要。使用一个完整的GEANT模拟，开放的魅力测量能力的星与HFT将显示。它在宽$\pt$范围内的性能将在$\D$介子的$v_{2}$（$\pt > 0.5\mathrm{GeV}/c$）和$R_\mathrm{CP}$（$\pt < 10\mathrm{GeV}/c$）测量上得到证实。本文给出了重离子碰撞中$\Lc$重子的重建结果。
英文摘要：
Anisotropic flow measurements have demonstrated development of partonic collectivity in $200\mathrm{GeV}$ Au+Au collisions at RHIC. To understand the partonic EOS, thermalization must be addressed. Collective motion of heavy-flavor (c,b) quarks can be used to indicate the degree of thermalization of the light-flavor quarks (u,d,s). Measurement of heavy-flavor quark collectivity requires direct reconstruction of heavy-flavor hadrons in the low $\pt$ region. Measurement of open charm spectra to high $\pt$ can be used to investigate heavy-quark energy loss and medium properties. The Heavy Flavor Tracker (HFT), a proposed upgrade to the STAR experiment at midrapidity, will measure $v_{2}$ of open-charm hadrons to very low $\pt$ by reconstructing their displaced decay vertices. The innermost part of the HFT is the PIXEL detector (made of two low mass monolithic active pixel sensor layers), which delivers a high precision position measurement close to the collision vertex. The Intermediate Silicon Tracker (IST), a 1-layer strip detector, is essential to improve hit identification in the PIXEL detector when running at full RHIC-II luminosity. Using a full GEANT simulation, open charm measurement capabilities of STAR with the HFT will be shown. Its performance in a broad $\pt$ range will be demonstrated on $v_{2}$ ($\pt > 0.5\mathrm{GeV}/c$) and $R_\mathrm{CP}$ ($\pt < 10\mathrm{GeV}/c$) measurements of $\D$ meson. Results of reconstruction of $\Lc$ baryon in heavy-ion collisions are presented.
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。
