First measurement of charm meson production in lead-lead collisions at the CERN SPS

该项目的主要目标是测量中心Pb+Pb碰撞中150 A GeV/c的粲介子产生，这将在2018年11月和12月的NA 61/SHINE Pb运行期间记录。这将是第一次直接测量欧洲核子研究中心SPS能量的Pb+Pb碰撞中的开粲产生。在此测量之后，将在2021-2024年对40 A和150 A GeV/c的Pb+Pb碰撞中的开粲进行精确测量（不包括在本项目中）。此外，在该项目中，将开发与开放魅力测量相关的最终数据重建和分析程序。该过程将用于未来的NA 61/SHINE开粲测量，新的测量将提供期待已久的实验信息，以回答以下问题：夸克-胶子等离子体的形成如何影响Charmonia的产生？解除禁锢的开始如何影响开放式魅力的产生？开放魅力和魅力产生的机制是什么？该项目的工作计划假设DFG基金将于2019年初开始，其中包括一名博士后和一名博士研究员三年的资金。研究人员将致力于重建软件的开发，数据质量削减，模拟和数据分析。该项目的最后一项工作是公布150 A GeV/c中心Pb+Pb碰撞中D介子产额的结果。法兰克福歌德大学的NA 61/SHINE小组积极参与了小型接收顶点探测器SAVD的建造和测试。SAVD被添加到NA 61/SHINE设置中，用于开放式Charm测量。因此，在法兰克福歌德大学进行的SAVD的第一个物理数据的分析将是过去硬件工作的必要高潮。

The primary goal of the project is to measure charm meson productionin central Pb+Pb collisions at 150A GeV/c which will be recorded during the NA61/SHINE Pb run in November and December 2018. This will be the first direct measurement of open charm production in Pb+Pb collisions the CERN SPS energies. This measurement will be followed by precise measurements of open charm in Pb+Pb collisions at 40A, and 150A GeV/c in 2021-2024 (not covered by this project). Furthermore, within the project a final data reconstruction and analysis procedures related to the open charm measurements will be developed. The procedures will be used for the future NA61/SHINE open charm measurements.The new measurements will provide the long-awaited experimental information needed to answer the following questions-How does the formation of quark-gluon plasma impact charmonia production?-How does the onset of deconfinement impact open charm production?-What is the mechanism of open charm and charmonia production?The work program of the proposed project assumes that the DFG fundingwill start at the beginning 2019 and it will include funds for one post-doctoral and one doctoral researcher for three years.The researchers will work on the development of the reconstruction software, data quality cuts, simulation and data analysis. The project will be concluded by publication of the result on D-meson yield in central Pb+Pb collisions at 150A GeV/c.The NA61/SHINE group from the Goethe-University Frankfurt am Main was actively involved in the construction and tests of the Small Acceptance Vertex Detector, SAVD. SAVD was add to the NA61/SHINE set-up for the open charm measurements. Thus, the analysis of the first physics data from the SAVD performed at the Goethe University Frankfurt am Main Frankfurt would be the necessary culmination of the past hardware effort.