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- Lai, Y.-T.;
- Koga, T.;
- Iwasaki, Y.;
- Ahn, Y.;
- Bae, H.;
- ... Lee, M.J.;
- 외 29명
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0초록
The Belle II experiment is designed to search for physics beyond the Standard Model by investigating rare decays at the SuperKEKB e+e− collider. Owing to the significant beam background at high luminosity, the data acquisition system employs a hardware-based Level-1 Trigger to reduce the readout data throughput by selecting collision events of interest in real time. The Belle II Level-1 Trigger system utilizes FPGAs to reconstruct various detector observables from the raw data for trigger decision-making. The Level-1 trigger rate is limited to 30 kHz at the maximum expected instantaneous luminosity of SuperKEKB. To ensure reliable B physics measurements, the trigger efficiency for hadronic events, specifically, e+e−→BB̄ and e+e−→qq̄ processes, where q=u,d,s,c, must be close to 100%. The Global Reconstruction Logic receives these observables from four sub-trigger systems and provides a global summary for the final trigger decision. Its logic encompasses charged particle tracking, matching between sub-triggers, and the identification of special event topologies associated with low-multiplicity decays. This article discusses the hardware devices, FPGA firmware, integration with peripheral systems, and the design and performance of the trigger algorithms implemented within the Global Reconstruction Logic. © 2025 Elsevier B.V.
키워드
- 제목
- Design of the Global Reconstruction Logic in the Belle II Level-1 Trigger system
- 저자
- Lai, Y.-T.; Koga, T.; Iwasaki, Y.; Ahn, Y.; Bae, H.; Campajola, M.; Cheon, B.G.; Cho, H.-E.; Ferber, T.; Haide, I.; Heine, G.; Hsu, C.-L.; Kiesling, C.; Kim, C.-H.; Kim, J.B.; Kim, K.; Kim, S.H.; Lee, I.S.; Lee, M.J.; Liao, Y.P.; Lin, J.; Little, A.; Moon, H.K.; Nakazawa, H.; Neu, M.; Nishida, S.; Reuter, L.; Savinov, V.; Sheng, T.-A.; Shiu, J.-G.; Sue, Y.; Unger, K.; Unno, Y.; Won, E.; Xu, Z.
- 발행일
- 2025-09
- 유형
- Article
- 권
- 1078