Full Jet Reconstruction In Relativistic Heavy Ion Collisions

量子色动力学（QCD）是强作用力的基本理论，它预言夸克和胶子的释放会产生一种新的物质相，即夸克胶子等离子体（QGP）。在过去的10年里，在相对论重离子对撞机（RHIC）上进行的实验验证了这一预测，并探索了这种新形式物质的性质。虽然对QCD计算的天真解释表明，RHIC产生的QGP应该表现得像一种稀释气体，但实验结果提供了证据，证明它更像一种近乎“完美”的液体，对有色部分子的通过是不透明的。 2010年11月，大型强子对撞机成功地进行了第一次重离子碰撞，其质心能量达到了前所未有的2.76 TeV，探索了相图的新区域。 在大型强子对撞机上，将有各种各样的高能硬探测器测量结果可用于广泛的扩展运动学范围。这些新的测量将量化QGP的基本属性。这个建议的智力价值来自PI的硬探针作为诊断工具，以确定热QCD物质的详细属性的重点。为了更完整，定量和歧视性的颜色部分子淬火的图片，并避免固有的偏见领先的强子测量，PI将重建喷流在相对论重离子碰撞在LHC使用CMS检测器。 她建议将知识的大颜色不透明的QGP的基本属性的确定，通过测量喷流结构和它的修改方面的能量流的一个公正的完整的射流重建测量核修改率的射流。通过这些强大的测量，她将确定QGP的关键特征，例如热QCD介质如何响应喷流能量损失以及QGP如何影响喷流结构。为了扩大该项目的影响，PI计划通过积极的研究和教育的整合，为核物理领域的多元化和竞争力建立一个培养环境。她将在夏季学期从罗格斯大学的阿雷斯蒂项目中招募和指导两名少数民族和女大三学生，并继续全年为他们提供支持。她计划将这些本科生纳入研究的各个阶段，包括数据采集、分析、在会议上展示结果以及撰写经评审的论文。

Quantum chromodynamics (QCD), the fundamental theory of the strong force, predicts the liberation of quarks and gluons to create a new phase of matter, the Quark Gluon Plasma (QGP). During the last 10 years, experiments performed at the Relativistic Heavy Ion Collider (RHIC) tested this prediction and explored the properties of this novel form of matter. While the naive interpretations of QCD calculations suggested that this QGP produced at RHIC should behave like a dilute gas, the experimental results provided evidence that it behaves more like a nearly `perfect' liquid, which is opaque to the passage of colored partons. In November 2010, LHC successfully delivered the first heavy ion collisions at an unprecedented center-of-mass energy of 2.76 TeV to explore new regions of the phase diagram. A wide variety of energetic hard probe measurements will be available over a broad extended kinematic range at LHC. These new measurements will quantify the fundamental properties of QGP.The intellectual merit of this proposal derives from the PI's focus on hard probes as a diagnostic tool to determine the detailed properties of the hot QCD matter. For a more complete, quantitative and discriminatory picture of quenching of the color partons and to avoid intrinsic biases of leading hadron measurements, the PI will reconstruct jets in relativistic heavy ion collisions at LHC using the CMS detector. She proposes to transform knowledge of the large color opaqueness of the QGP to the determination of its fundamental properties by the measurements of jet structure and its modification in terms of energy flow by an unbiased full jet reconstruction to measure nuclear modification ratios of jets. With these robust measurements, she will determine key features of QGP such as how hot QCD medium responds to jet energy loss and how QGP affects jet structures. For broader impacts of this project, the PI plans to establish a cultivating environment for a diverse and competitive work force in nuclear physics via integration of active research and education. She will recruit and mentor two minority and female junior undergraduates from Rutgers's Aresty program for the summer term and continue supporting them throughout the year. She plans to include these undergraduates in all phases of research, including data taking, analysis, presentation of results at meetings, and writing refereed papers.