Track-based alignment for the ATLAS Inner Detector Tracking System

TL;DR

This paper presents a comprehensive approach to aligning the ATLAS Inner Detector using track-based methods, calorimeter data, and physics constraints, improving detector performance and calibration.

Contribution

It introduces a combined alignment strategy utilizing multiple data sources and physics quantities, enhancing the accuracy of detector alignment beyond traditional methods.

Findings

Improved alignment accuracy demonstrated in detector performance metrics.

Successful integration of calorimeter and physics data into the alignment process.

Insights gained from the commissioning experience of the detector.

Abstract

We discuss the track-based alignment for the Inner Detector of the ATLAS experiment. After describing the main alignment method based on the minimization of hit residuals, we focus on alignment methods using information from the electromagnetic calorimeter as well as information obtained from physics quantities like the invariant mass of the J/$\psi$-resonance. We present an overview of the current performance of the ATLAS Inner Detector and conclude with some general remarks summarizing the experience of the commissioning of the detector from the alignment point of view.