LArIAT实验中首次观测静止反质子在氩上的湮灭
First Observation of Antiproton Annihilation At Rest on Argon in the LArIAT Experiment
AI总结：
本研究利用LArIAT实验首次观测静止反质子在氩上的湮灭，通过人工和自动两种方法测量径迹多重数等参数，结果与模拟及理论预测吻合，为氩核内湮灭相互作用建模提供支撑。
摘要：
我们报道了利用LArIAT实验首次观测并测量静止反质子在氩上的湮灭现象。来自带电粒子试验束的反质子在LArIAT的液氩时间投影室（LArTPC）内静止后，通过束线仪器和LArTPC径迹重建算法被识别出来。我们通过人工扫描手动评估了湮灭顶点产生的带电粒子径迹的多重数，得到的分布均值为3.2±0.4条径迹，标准差为1.3条径迹。这一结果与自动径迹重建的结果一致，自动重建得到的均值为2.8±0.4条径迹，标准差为1.2条径迹。两种方法得到的实验数据都与蒙特卡罗模拟结果吻合良好。此外，我们还报道了出射径迹的簇射多重数和粒子鉴别结果，二者均与理论预测高度一致。这些发现将有助于构建反质子在氩核内湮灭相互作用的模型，包括中子-反中子振荡等场景。
英文摘要：
We report the first observation and measurement of antiproton annihilation at rest on argon using the LArIAT experiment. Antiprotons from a charged particle test beam that come to rest inside LArIAT's liquid argon time projection chamber (LArTPC) are identified through beamline instrumentation and LArTPC track reconstruction algorithms. The multiplicity of charged particle tracks originating from the annihilation vertex is manually assessed through hand-scanning, resulting in a distribution with a mean of 3.2 $\pm$ 0.4 tracks and a standard deviation of 1.3 tracks. This is consistent with an automated track reconstruction, which produces a mean of 2.8 $\pm$ 0.4 tracks and a standard deviation of 1.2 tracks. Good agreement is found between data and Monte Carlo simulations for both methods. Additionally, we report the shower multiplicity and particle identification of outgoing tracks, both of which align closely with theoretical predictions. These findings will contribute to modeling of intranuclear annihilation interactions on argon, including scenarios such as neutron-antineutron oscillations.
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