Open Charm measurements at the NA61 experiment at CERN SPS

D. Larsen, A. Merzlaya
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Abstract

The strong interactions programme of the NA61/SHINE experiment at CERN SPS has been extended through the use of new silicon Vertex Detector which provides precise measurements of exotic particles with short lifetime. The detector was designed to meet the challenges of primary and secondary vertexes reconstruction at high spatial resolution. An initial version of the Vertex Detector called SAVD (Small Acceptance Vertex Detector) was installed last end of 2016, and data was from Pb+Pb collisions was collected in 2016, for Xe+La in 2017, as well as further Pb+Pb collisions this year. First indication of a D$^0$ peak at SPS energies has been observed. The physics motivation behind the open charm measurements will be discussed, as well as the analysis of collected data on open charm production and the future plans of open charm measurements in NA61/SHINE experiment related to the upgraded version of the vertex detector.
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在欧洲核子研究中心SPS的NA61实验中的开放粲数测量
欧洲核子研究中心SPS的NA61/SHINE强相互作用实验项目通过使用新型硅顶点探测器进行了扩展,该探测器提供了短寿命奇异粒子的精确测量。该探测器旨在满足高空间分辨率下的主次点重建挑战。最初版本的顶点检测器SAVD (Small Acceptance Vertex Detector)于2016年底安装,2016年收集了Pb+Pb碰撞的数据,2017年收集了Xe+La碰撞的数据,今年又收集了Pb+Pb碰撞的数据。首次观测到在SPS能量处的D$^0$峰。本文将讨论开放粲数测量背后的物理动机,并分析收集到的关于开放粲数产生的数据,以及与升级版顶点检测器相关的NA61/SHINE实验中开放粲数测量的未来计划。
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