mkFit for track fitting with the CMS Phase-2 detector

Leonardo Giannini; Emmanouil Vourliotis

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arXiv · 2609.24659

mkFit for track fitting with the CMS Phase-2 detector

Leonardo Giannini·Emmanouil Vourliotis

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Abstract

The mkFit algorithm provides an implementation of the Kalman filter-based track reconstruction algorithm that exploits both thread- and data-level parallelism. It has been adopted by the CMS Collaboration as the primary track building algorithm during the Run 3 of the LHC for both the online and offline track reconstruction sequences. Thanks to mkFit, an average speedup of a factor 3.5 is achieved in track building while retaining or improving physics performance. As a consequence of the speedup provided by mkFit in track building, track fitting has become a comparably significant component of the overall tracking time. Given the increased demands of the High-Luminosity Large Hadron Collider, further speedup can be achieved by extending mkFit to the track fitting task. We present preliminary results for track fitting in the CMS High-Level Trigger using mkFit, covering both the physics and the computational performance, based on realistic Phase-2 simulations.

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Leonardo Giannini, Emmanouil Vourliotis. 2026-09-21. mkFit for track fitting with the CMS Phase-2 detector. https://arxiv.org/abs/2609.24659

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