Jet reconstruction and jet background classification with the ALICE experiment in PbPb collisions at the LHC

TL;DR

This paper assesses how background fluctuations and correlations in heavy-ion collisions affect jet reconstruction in the ALICE experiment, crucial for accurate interpretation of jet properties.

Contribution

It provides a detailed evaluation of background effects on jet spectra using embedded probes in PbPb collision data, advancing understanding of background influence.

Findings

Background fluctuations significantly impact jet spectrum measurements.

Region-to-region correlations can locally alter jet energy estimates.

Quantitative assessment of background effects informs more accurate jet analysis.

Abstract

For a quantitative interpretation of reconstructed jet properties in heavy-ion collisions it is paramount to characterize the contribution from the underlying event and the influence of background fluctuations on the jet signal. In addition to the pure number fluctuations, region-to-region correlated background within one event can enhance or deplete locally the level of background and modify the jet energy. We show a first detailed assessment of background effects using different probes embedded into heavy-ion data and quantify their influence on the reconstructed jet spectrum.