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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2508.03537 |
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| _version_ | 1866910071555883008 |
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| author | Betts, Wayne Chen, Jinhui Fisyak, Yuri Ke, Hongwei Kisel, Ivan Kisel, Pavel Kozlov, Grigory Landgraf, Jeffery Lauret, Jerome Ljubicic, Tonko Ma, Yugang Margetis, Spyridon Qiu, Hao Shen, Diyu Shou, Qiye Sun, Xiangming Tang, Aihong Van Buren, Gene Vassiliev, Iouri Xi, Baoshan Ye, Zhenyu Zhang, Zhengqiao Zyzak, Maksym |
| author_facet | Betts, Wayne Chen, Jinhui Fisyak, Yuri Ke, Hongwei Kisel, Ivan Kisel, Pavel Kozlov, Grigory Landgraf, Jeffery Lauret, Jerome Ljubicic, Tonko Ma, Yugang Margetis, Spyridon Qiu, Hao Shen, Diyu Shou, Qiye Sun, Xiangming Tang, Aihong Van Buren, Gene Vassiliev, Iouri Xi, Baoshan Ye, Zhenyu Zhang, Zhengqiao Zyzak, Maksym |
| contents | To meet the demands of the Beam Energy Scan phase-II (BES-II) program, the STAR experiment at RHIC developed a dual real-time framework consisting of a High Level Trigger (HLT) and an Express Data Production system (xProduction).
The HLT operates online within the Data Acquisition (DAQ) chain on a multicore CPU cluster, with optional acceleration using Xeon Phi coprocessors. It employs parallelized algorithms, such as the Cellular Automaton track finder, for fast tracking, vertexing, and event filtering, enabling real-time event selection and detector monitoring.
In parallel, xProduction runs independently of the DAQ loop and performs near offline-quality calibration and reconstruction within hours. Using the express data stream, enhanced by HLT selections, and the STAR calibration framework, it enables early physics analysis and provides collaboration-wide access to analysis-ready datasets.
Together, HLT and xProduction form a complementary system combining real-time selection with rapid high-quality reconstruction. This framework has enabled prompt reconstruction of the ${}^5_Λ\mathrm{He}$ hypernucleus and efficient processing of large datasets, demonstrating scalability for future high-luminosity experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_03537 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The High Level Trigger and Express Data Production at STAR Betts, Wayne Chen, Jinhui Fisyak, Yuri Ke, Hongwei Kisel, Ivan Kisel, Pavel Kozlov, Grigory Landgraf, Jeffery Lauret, Jerome Ljubicic, Tonko Ma, Yugang Margetis, Spyridon Qiu, Hao Shen, Diyu Shou, Qiye Sun, Xiangming Tang, Aihong Van Buren, Gene Vassiliev, Iouri Xi, Baoshan Ye, Zhenyu Zhang, Zhengqiao Zyzak, Maksym Instrumentation and Detectors High Energy Physics - Experiment Nuclear Experiment To meet the demands of the Beam Energy Scan phase-II (BES-II) program, the STAR experiment at RHIC developed a dual real-time framework consisting of a High Level Trigger (HLT) and an Express Data Production system (xProduction). The HLT operates online within the Data Acquisition (DAQ) chain on a multicore CPU cluster, with optional acceleration using Xeon Phi coprocessors. It employs parallelized algorithms, such as the Cellular Automaton track finder, for fast tracking, vertexing, and event filtering, enabling real-time event selection and detector monitoring. In parallel, xProduction runs independently of the DAQ loop and performs near offline-quality calibration and reconstruction within hours. Using the express data stream, enhanced by HLT selections, and the STAR calibration framework, it enables early physics analysis and provides collaboration-wide access to analysis-ready datasets. Together, HLT and xProduction form a complementary system combining real-time selection with rapid high-quality reconstruction. This framework has enabled prompt reconstruction of the ${}^5_Λ\mathrm{He}$ hypernucleus and efficient processing of large datasets, demonstrating scalability for future high-luminosity experiments. |
| title | The High Level Trigger and Express Data Production at STAR |
| topic | Instrumentation and Detectors High Energy Physics - Experiment Nuclear Experiment |
| url | https://arxiv.org/abs/2508.03537 |