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Improved track reconstruction for prompt and long-lived particles in ATLAS for the LHC Run 3

In preparation for the LHC Run 3, the ATLAS experiment at the LHC has completed a major eﬀort to improve the track reconstruction performance for prompt and long-lived particles. Resource consumption was halved while expanding the charged-particle reconstruction capacity. Large-radius track reconstruction, targeting long-lived particles, was optimized to run in all events expanding the potential phase-space of these searches. The detector alignment precision was improved to avoid limiting factors for precision measurements of Standard Model processes. Mixture density networks and simulating radiation damage eﬀects improved the position estimate of charged particles overlapping in the ATLAS pixel detector, bolstering downstream algorithms’ performance. The Adaptative Multi-Vertex Finder replaced the Iterative Vertex Finder for primary vertex reconstruction, improving the vertex reconstruction eﬃciency in high pile-up environments like such expected for the LHC Run 3. This contribution highlights the above achievements and reports on the readiness of the ATLAS detector for Run 3 collisions at 13.6 TeV.