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A parametrized Kalman filter for fast track fitting at LHCb

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arxiv 2101.12040 v2 pith:SQGS2LGG submitted 2021-01-28 physics.ins-det hep-ex

A parametrized Kalman filter for fast track fitting at LHCb

Pierre Billoir (1) , Michel De Cian (2) , Paul Andr\'e G\"unther (3) , Simon Stemmle (3) ((1) LPNHE , Sorbonne Universit\'e , Paris Diderot Sorbonne Paris Cit\'e , CNRS/IN2P3 , Paris
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France (2) Institute of Physics Ecole Polytechnique F\'ed\'erale de Lausanne (EPFL) Lausanne Switzerland (3) Physikalisches Institut Ruprecht-Karls-Universit\"at Heidelberg Heidelberg Germany)
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classification physics.ins-det hep-ex
keywords lhcbfilterkalmantrackfittingimplementationachievedalternative
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present an alternative implementation of the Kalman filter employed for track fitting within the LHCb experiment. It uses simple parametrizations for the extrapolation of particle trajectories in the field of the LHCb dipole magnet and for the effects of multiple scattering in the detector material. A speedup of more than a factor of four is achieved while maintaining the quality of the estimated track quantities. This Kalman filter implementation could be used in the purely software-based trigger of the LHCb upgrade.

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  1. Track fitting at the full LHC collision rate

    hep-ex 2026-07 conditional novelty 5.0

    A parameterised Kalman filter on GPUs fits full tracks in LHCb's HLT1 trigger at 30 MHz, halving reconstructed D0 and J/ψ mass widths and more than halving ghost-track efficiency.