Speaker
Description
Jet quenching is one of the most powerful probes for studying the transport properties of the quark-gluon plasma (QGP). In this work, we use the Linear Boltzmann Transport (LBT) model to study two related aspects of jet-medium interactions: photon-tagged jet observables and multi-point energy correlators.
The first part focuses on (\gamma)-jet production. We use recent CMS measurements in Pb+Pb collisions at (\sqrt{s_{\text{NN}}}=5.02) TeV, including the (x_{J\gamma}) distribution, the photon-jet azimuthal correlation, and the nuclear modification factor (I_{\text{AA}}), to constrain the effective strength of jet-medium interactions in the LBT model. With the same setup, we then make predictions for (\gamma)-jet observables in O+O collisions. In particular, we study how jet energy loss, associated subleading jets, and hadronization effects appear in this smaller collision system.
The second part studies energy-energy correlators (EECs) as jet substructure observables. We focus on the three-point energy-energy-energy correlator (EEEC) in the ((\xi, \phi)) shape space. The AA/pp ratio of the EEEC shows that the medium modification is not uniform over the three-point geometry. Instead, the modification is most pronounced in broad-angle and near-equilateral configurations. To understand where this structure comes from, we decompose the partonic EEEC into contributions from the vacuum jet shower, medium-induced gluon radiation, and collective medium response. By varying the coupling strength, the angular scale (R_L), and the energy-weighting parameter n, we find that radiation-related and medium-response-related triplets populate different regions of the EEEC shape space. This decomposition helps clarify how perturbative shower modification and wake-like medium response contribute to multi-point jet correlations.
Together, these two studies examine different sides of jet quenching within the same transport framework. The (\gamma)-jet analysis is aimed at constraining the overall energy-loss phenomenology and making predictions for O+O collisions, while the energy-correlator study uses jet substructure to probe the angular pattern and microscopic origin of the medium modification.
| 请选择分会 | 高能重离子物理 |
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