论文标题
使用早期光束碰撞数据对BELLE II光谱仪的气门富计数器的性能评估
Performance evaluation of the aerogel RICH counter for the Belle II spectrometer using early beam collision data
论文作者
论文摘要
气瓶环成像Cherenkov（Arich）计数器在Belle II光谱仪的正向端盖区域充当粒子识别装置。它能够通过检测硅胶散热器中发出的Cherenkov光子来识别最多$ 4 \，{\ rm Gev}/c $的乳头和kaons。在检测器的比对和概率密度函数的校准之后，我们使用早期梁碰撞数据评估了Arich计数器的性能。 $ d^{\ ast+} \ to d^0π^+（d^0 \ to k^-π^+）$的事件样本用于确定$π（k）$效率和$ k（π）$错误识别概率。我们发现，Arich计数器能够以$ 93.5 \ pm 0.6 \，\％$的质量识别概率为$ 10.9 \ pm 0.9 \，0.9 \，\％$的标识效率分开kaons。本文介绍了计数器的识别方法以及对绩效的早期操作评估。
The Aerogel Ring Imaging Cherenkov (ARICH) counter serves as a particle identification device in the forward end-cap region of the Belle II spectrometer. It is capable of identifying pions and kaons with momenta up to $4 \, {\rm GeV}/c$ by detecting Cherenkov photons emitted in the silica aerogel radiator. After the detector alignment and calibration of the probability density function, we evaluate the performance of the ARICH counter using early beam collision data. Event samples of $D^{\ast +} \to D^0 π^+ (D^0 \to K^-π^+)$ were used to determine the $π(K)$ efficiency and the $K(π)$ misidentification probability. We found that the ARICH counter is capable of separating kaons from pions with an identification efficiency of $93.5 \pm 0.6 \, \%$ at a pion misidentification probability of $10.9 \pm 0.9 \, \%$. This paper describes the identification method of the counter and the evaluation of the performance during its early operation.
