Implementation of ACTS into sPHENIX track reconstruction

TL;DR

This paper discusses integrating the ACTS track reconstruction toolkit into the sPHENIX experiment to improve track reconstruction efficiency and speed, including implementing TPC geometry within ACTS for high-energy nuclear physics data analysis.

Contribution

The paper presents the first implementation of ACTS in sPHENIX, optimizing track reconstruction for high occupancy events and including TPC geometry integration.

Findings

Achieved high-efficiency track reconstruction within 5 seconds per event.

Successfully integrated TPC geometry into ACTS.

Demonstrated performance improvements in sPHENIX data analysis.

Abstract

sPHENIX is a high energy nuclear physics experiment under construction at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL). The primary physics goals of sPHENIX are to study the quark-gluon-plasma, as well as the partonic structure of protons and nuclei, by measuring jets, their substructure, and heavy flavor hadrons in $p$$+$$p$, $p$+Au, and Au+Au collisions. sPHENIX will collect approximately 300 PB of data over three run periods, to be analyzed using available computing resources at BNL; thus, performing track reconstruction in a timely manner is a challenge due to the high occupancy of heavy ion collision events. The sPHENIX experiment has recently implemented the A Common Tracking Software (ACTS) track reconstruction toolkit with the goal of reconstructing tracks with high efficiency and within a computational budget of 5 seconds per minimum bias event. This paper reports the performance status of ACTS as the default track fitting tool within sPHENIX, including discussion of the first implementation of a time projection chamber geometry within ACTS.