002819858 001__ 2819858
002819858 005__ 20221114151337.0
002819858 0248_ $$aoai:cds.cern.ch:2819858$$pcerncds:FULLTEXT
002819858 037__ $$aLHCb-PROC-2022-009
002819858 035__ $$9Inspire$$a2126070
002819858 041__ $$aeng
002819858 088__ $$aCERN-LHCb-PROC-2022-009
002819858 100__ $$aGünther, Paul Andre$$uHeidelberg U.
002819858 245__ $$aLHCb’s Forward Tracking algorithm for the Run 3 CPU-based online track reconstruction sequence
002819858 260__ $$c2022
002819858 269__ $$aGeneva$$bCERN$$c26 Jul 2022
002819858 270__ [email protected]
002819858 300__ $$a7 p
002819858 520__ $$aIn Run 3 of the LHC the LHCb experiment faces very high data rates containing beauty and charm hadron decays. Thus the task of the trigger is not to select any beauty and charm events, but to select those containing decays interesting for the LHCb physics programme. LHCb has therefore implemented a real-time data processing strategy to trigger directly on reconstructed events. The first stage of the purely software-based trigger is implemented on GPUs performing a partial event reconstruction. In the second stage of the software trigger, the full, offline-quality event reconstruction is performed on CPUs, with a crucial part being track reconstruction, balancing track finding efficiency, fake track rate and event throughput. In these proceedings, LHCb's CPU-based track reconstruction sequence for Run 3 is presented, highlighting the "Forward Tracking", which is the algorithm that reconstructs charged particle trajectories traversing all of LHCb's tracking detectors. To meet event throughput requirements, the "Forward Tracking" uses SIMD instructions in several core parts of the algorithm, such as the Hough transform and cluster search. These changes led to an improvement of the algorithm's event throughput by 60%.
002819858 540__ $$3preprint$$aCC-BY-4.0$$uhttps://creativecommons.org/licenses/by/4.0/deed.fr
002819858 542__ $$3preprint$$f© 2022 CERN for the benefit of the LHCb collaboration
002819858 595__ $$aCERN EDS
002819858 65017 $$2SzGeCERN$$aParticle Physics - Experiment
002819858 65027 $$2SzGeCERN$$aPHYS
002819858 6531_ $$9CERN$$aLHCb
002819858 6531_ $$9CERN$$aFlavour Physics
002819858 690C_ $$aCERN
002819858 690C_ $$aINTNOTE
002819858 690C_ $$aPUBLLHCB
002819858 690C_ $$aINTNOTELHCBPROCPUBL
002819858 693__ $$aCERN LHC$$eLHCb
002819858 710__ $$5PH-EP
002819858 859__ [email protected]
002819858 8564_ $$82380672$$s470004$$uhttp://cds.cern.ch/record/2819858/files/LHCb-PROC-2022-009.pdf
002819858 903__ $$spublic
002819858 916__ $$sn$$w202230
002819858 962__ $$b2816267$$nprinceton20220531
002819858 963__ $$aPUBLIC
002819858 970__ $$a000776271CER
002819858 980__ $$aINTNOTELHCBPROCPUBL
002819858 980__ $$aCONFERENCEPAPER