Speaker
Description
This study presents the first measurement of inclusive charged-particle jet spectra in different centrality classes of Pb–Pb collisions, utilizing the high-statistics Run 3 data collected by ALICE. We analyze the nuclear modification factor ($R_{cp}$) and the azimuthal anisotropy ($v_2$) of jets. Jets, originating from the fragmentation of high-energy partons, traverse the quark-gluon plasma (QGP) in heavy-ion collisions, losing energy primarily through medium-induced gluon radiation and elastic scattering. These processes lead to modifications in jet yields and structure. Due to the geometric shape of the collision, partons emitted at different angles experience different path lengths within the QGP, resulting in an azimuthal anisotropy in jet energy loss, which is quantified by the second-order flow coefficient ($v_2$).
To quantify jet quenching effects, we measure jet $R_{cp}$, defined as the ratio of jet $p_{\rm{T}}$ spectra in central Pb–Pb collisions to those in peripheral Pb–Pb collisions and pp baselines. Additionally, we perform the first analysis of inclusive charged-particle jet $v_2$ in Pb–Pb collisions, leveraging ALICE's upgraded detectors to extend the measurement to lower $p_{\rm{T}}$. The study of low-$p_{\rm{T}}$ jets is particularly crucial for constraining theoretical models and understanding the mechanisms responsible for jet $v_2$ generation. Finally, our results will be compared with existing jet $v_2$ measurements, further probing the properties of the QGP and the path-length dependence of jet energy loss.
