A Downstream and vertexing algorithm for Long Lived Particles (LLP) selection at the first High-level trigger (HLT1) of LHCb
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909687637606400 |
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| author | Kholoimov, V. Jashal, B. Kishor Oyanguren, A. Svintozelskyi, V. Zhuo, J. |
| author_facet | Kholoimov, V. Jashal, B. Kishor Oyanguren, A. Svintozelskyi, V. Zhuo, J. |
| contents | A new algorithm has been developed at LHCb which is able to reconstruct and select very displaced vertices in real-time at the first level of the trigger (HLT1). It makes use of the Upstream Tracker (UT) and the Scintillator Fiber detector (SciFi) of LHCb and it is executed on GPUs inside the Allen framework. In addition to an optimized strategy, it utilizes a Neural Network (NN) implementation to increase the track efficiency and reduce the ghost rates, with very high throughput and limited time budget. Besides serving to reconstruct $K_{s}^{0}$ and $Λ$ particles from the Standard Model, the Downstream algorithm and the associated two-track vertexing could largely increase the LHCb physics potential for detecting long-lived particles during the Run 3. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_13092 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Downstream and vertexing algorithm for Long Lived Particles (LLP) selection at the first High-level trigger (HLT1) of LHCb Kholoimov, V. Jashal, B. Kishor Oyanguren, A. Svintozelskyi, V. Zhuo, J. High Energy Physics - Experiment Instrumentation and Detectors A new algorithm has been developed at LHCb which is able to reconstruct and select very displaced vertices in real-time at the first level of the trigger (HLT1). It makes use of the Upstream Tracker (UT) and the Scintillator Fiber detector (SciFi) of LHCb and it is executed on GPUs inside the Allen framework. In addition to an optimized strategy, it utilizes a Neural Network (NN) implementation to increase the track efficiency and reduce the ghost rates, with very high throughput and limited time budget. Besides serving to reconstruct $K_{s}^{0}$ and $Λ$ particles from the Standard Model, the Downstream algorithm and the associated two-track vertexing could largely increase the LHCb physics potential for detecting long-lived particles during the Run 3. |
| title | A Downstream and vertexing algorithm for Long Lived Particles (LLP) selection at the first High-level trigger (HLT1) of LHCb |
| topic | High Energy Physics - Experiment Instrumentation and Detectors |
| url | https://arxiv.org/abs/2503.13092 |