BuSca: A Buffer Scanner at HLT1 to detect LLPs beyond the SM at LHCb

BuSca is a LHCb project prototype designed for long-lived parti cle searches in real-time, leveraging the enhanced parallelization capabilities of the new LHCb trigger scheme implemented on GPUs. BuSca algorithms are focused at present on downstream reconstructed tracks, which exclusively let hits in the UT and SciFi detectors. By projecting physics candidates onto 2D histograms of flight distance and mass hypotheses at 30 MHz rate, BuSca identifies hot spots indicative of potential candidates of new particles, thereby providing strategic guidance for the development of new trigger lines. Additionally, BuSca offers an Armenteros-Podolanski representation, providing insights into the mass hypotheses of the decay products associated with the new particle. The performance of BuSca, including the outcomes of its initial prototype on simulated and real data, will be elucidated in this manuscript.