Vertexing detectors and vertexing performance in Run 2 in ALICE

TL;DR

This paper discusses the ALICE detector's Inner Tracking System, highlighting its role in vertexing and tracking during Run 2, and presents physics results achieved through its high-precision capabilities.

Contribution

It provides a detailed analysis of the ITS's performance in vertexing and tracking, and demonstrates its impact on physics results in Run 2 at the LHC.

Findings

High-precision impact parameter resolution achieved

Successful reconstruction of secondary vertices in various collision systems

Physics results enabled by advanced vertexing capabilities

Abstract

The ALICE apparatus includes an Inner Tracking System for high-precision vertexing and tracking at midrapidity. Thanks to this detector, remarkable results were obtained with Run 2 data in all collision systems studied at the LHC. In this contribution, the role of the ITS in the event, track and secondary vertex reconstruction is highlighted, and the comparison of the resolution on the track impact parameter to the collision point in data and Monte Carlo simulations is reported. Finally, some of the main physics results obtained in pp and Pb--Pb collisions relying on the excellent ALICE vertexing and tracking capabilities are presented.