全SIDDHARTA-2实验装置用4 He气体靶的首次试验
First tests of the full SIDDHARTA-2 experimental apparatus with a 4 He gaseous target
摘要：
本文介绍了在弗拉斯卡蒂的INFN国家实验室的DAΦNE对撞机的相互作用区上完全安装SIDDHARTA-2实验装置后进行的第一次测试。在开始K介子氘2 p { \rightarrow } 1 s跃迁的第一次测量之前，准确评估背景抑制。主要是用K介子触发器系统实现的。在2022年4月26日至2025年5月26日期间使用4 He气体目标进行的该运行证实了在2021年使用简化版本的设置和不同的机器条件获得的10^5截留因子。这一重要结果促使用氘填充靶室并开始K介子氘2 p { \rightarrow } 1 s跃迁的测量活动。
英文摘要：
In this paper, we present the first tests performed after the full installation of the SIDDHARTA-2 experimental apparatus on the Interaction Region of the DAΦNE collider at the INFN National Laboratories of Frascati. Before starting the first measurement of the kaonic deuterium 2p{\rightarrow}1s transition, accurate evaluation of the background rejection. mainly achieved with the Kaon Trigger system, was required. This run, performed in the period 04-26/05/2022 with a 4 He gaseous target, confirmed the 10^5 rejection factor obtained with a reduced version of the setup and different machine conditions in 2021. This important outcome motivated the filling of the target cell with deuterium and the starting of the measurement campaign of the kaonic deuterium 2p{\rightarrow}1s transition.
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