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150A GeV/c的Pb+Pb中心碰撞中的粲介子产生，这将在2018年11月和12月的NA61/SHINE Pb运行期间记录。这将是第一次直接测量在CERN SPS能量下Pb+Pb碰撞中产生的开放粲数。在此测量之后，将在2021-2024年（不包括在本项目中）精确测量40A和150A GeV/c的Pb+Pb碰撞中的开放粲数。此外，在该项目内，将制定与开放魅力测量有关的最终数据重建和分析程序。该程序将用于未来的NA61/SHINE开放魅力测量。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粲子的产生？-界定的开始如何影响开放魅力的制作？——开放魅力和和谐产生的机制是什么？拟建项目的工作方案假设DFG资助将于2019年初开始，资助1名博士后和1名博士研究员，为期3年。研究人员将致力于重建软件、数据质量切割、模拟和数据分析的开发。该项目将在150A GeV/c下Pb+Pb中心碰撞的d介子产率结果公布后结束。来自法兰克福河畔歌德大学的NA61/SHINE小组积极参与了小接收顶点检测器SAVD的构建和测试。SAVD被添加到NA61/SHINE设置中用于开放魅力测量。因此，对在法兰克福河畔法兰克福歌德大学进行的SAVD的第一批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.