2024/09/18 by Liliana Apolinário, Lénea Luís, Apolinário, Liliana +5 · 1 citation
Engineering · Physics and Astronomy · #Aerodynamics and Acoustics in Jet Flows #Electromagnetic Compatibility and Noise Suppression #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Lightning and Electromagnetic Phenomena #Nuclear Theory (nucl-th)
paper · pdf · doi:10.48550/arxiv.2409.12238
openalex publication_date 2024/09/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The modifications imprinted on jets due to their interaction with Quark Gluon Plasma (QGP) are assessed by comparing samples of jets produced in nucleus-nucleus collisions and proton-proton collisions. The standard procedure ignores the effect of bin migration by comparing specific observables for jet populations at the same reconstructed jet transverse momentum (pT). Since jet pT is itself modified by interaction with QGP, all such comparisons confound QGP induced modifications with changes that are simply a consequence of comparing jets that started out differently. The quantile matching procedure introduced by Brewer et al. directly estimates average fractional jet energy loss (QAA) and can thus mitigate this pT migration effect. In this work, we validate the procedure in more realistic scenarios that include medium response. We study the evolution of QAA with jet radius, its sensitivity to minimum particle pT and medium response as implemented in two different models for jet evolution in heavy-ion collisions. Further, we use this procedure to establish that the difference between inclusive jet and γ+jet nuclear modification factors (RAA) is dominated by differences in the spectral shape, leaving the colour charge of the jet initiating parton with a lesser role to play. Additionally, we compare QAA to an experimentally proposed proxy for fractional jet energy loss, Sloss, showing that both quantities are similar, although the former provides a more clear physical interpretation. Finally, we show the size of the pT migration correction for four different substructure observables and how to reliably use the quantile procedure experimentally to improve existing measurements.