研究目的
To provide particle identification information in the forward endcap part of Belle II, efficiently separating charged kaons from pions for momenta between 0.5 GeV/c and 4.0 GeV/c, and to differentiate between pions, muons, and electrons in a region p≤1 GeV.
研究成果
The first phase of detector calibration has been successfully concluded, with Cherenkov rings observed from cosmic rays and beam collisions. The kaon identification efficiency using D±? decays has been studied, with calibration expected by the end of the commissioning phase.
研究不足
The vertical position of ARICH resulted in a low proportion of tracks that entered ARICH during the commissioning phase.
1：Experimental Design and Method Selection:
The ARICH detector uses a double layer aerogel radiator in a focusing configuration for Cherenkov photons emission, an empty space for light-cone expansion, and a segmented photo-sensor plane.
2：Sample Selection and Data Sources:
Studies were performed using D+?→D0(→K?π+)π+S channel where the charge of the slow pion πS is obtained from the tracking system.
3：List of Experimental Equipment and Materials:
The main components include aerogel tiles, Hybrid Avalanche PhotoDetectors (HAPDs), and planar mirrors.
4：Experimental Procedures and Operational Workflow:
ARICH assembly was completed in 2017, with aerogel tiles installed in an aluminium frame and detector modules attached to the structure.
5：Data Analysis Methods:
Kaon identification efficiency is calculated from the number of signal events where particles are identified as kaons in ARICH.
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