重味夸克（粲夸克和底夸克）具有较大的质量，并且主要产生于碰撞早期的硬部分子相互作用。因此，它们一直被认为是研究高能核-核碰撞环境中产生的量子色动力学（QCD）物质形态性质的理想探针。在RHIC和LHC能区都发现重味夸克在穿越该热密QCD介质时存在着与轻味夸克相同程度的抑制，即喷注抑制，这与微扰QCD（pQCD）理论预期是相悖的。RHIC/STAR实验于2014年1月份完成了重味径迹探测器（HFT）升级，HFT探测器由最里面的两层硅像素探测器（PIXEL），中间层硅径迹探测器（IST）和外层的硅微条探测器（SSD）组成，径迹分辨率达50微米。通过对移位顶点和开粲强子的直接拓扑重建的物理测量，HFT将大幅提升STAR实验在重味物理研究方面的能力。本项目包括HFT/IST硅探测器的实验数据刻度工作和高能核-核碰撞极端环境下重味喷注的实验研究，以期理解部分子在热密QCD物质中的能量损失机制。

Due to their heavy mass, heavy flavored quarks (charm and bottom) are produced dominately by the interactions of the initial incoming partons. Thus, they are regarded as a sensitive probe to study the properties of Quantum Chromodynamics (QCD) matter created in high-energy nuclear collisions. Experimental observations at both RHIC and LHC show the same jet suppression for light flavored hadrons and D mesons (or non-photonic electrons), which--contrary to pQCD expectations--may suggest similar energy loss for light quarks and gluons in the QCD medium. A Heavy Flavor Tracker (HFT) has been installed in the STAR experiment at the Relativistic Heavy Ion Collider (RHIC) since January 2014， which consists of two inner layers of silicon pixel detectors (PIXEL), an intermediate layer of silicon pad detector (IST) and an outer layer of silicon strip detector (SSD), and its tracking resolution is around 50 um. The HFT greatly enhances the capability for heavy flavor studies (energy loss mechanism and paronic thermalization) by measurements of displaced vertices and direct topological reconstruction of open charm hadrons.In this project, we will take calibrations for the IST detector. And we will carry out experimental studies on heavy flavor jet created in high-energy nucleus-nucleus collisions to understand parton energy loss mechanism in the hot and dense QCD matter.