Tracking in dense environments and its inefficiency measurement using pixel $dE/dx$

TL;DR

This paper measures charged particle reconstruction inefficiency in jet cores at the LHC using pixel $dE/dx$, finding less than 5% inefficiency, which improves upon previous results and aligns with simulations.

Contribution

It introduces a data-driven method using pixel $dE/dx$ to measure track inefficiency in dense environments, enhancing accuracy over prior techniques.

Findings

Inefficiency is less than 5% in jet cores.

The measurement aligns with Monte Carlo simulations.

The method improves upon previous inefficiency estimates.

Abstract

We present a measurement of the charged particle reconstruction inefficiency inside of jet cores, using data collected by the ATLAS experiment in 2015 of $pp$ collisions produced at the LHC, at a center-of-mass energy of 13 TeV. The determination of this inefficiency is important for jet energy scale and mass calibration, as well as multiple other performance studies and analyses. A data driven method is used, where the fraction of lost particle tracks is determined from energy deposition $dE/dx$ in the pixel detector. The fraction of lost tracks is found to be less than 5%, which is an improvement since the previous study, and agrees well within systematic uncertainties with a Monte Carlo simulation.