Speaker
Description
The energy-energy correlator (EEC) provides a powerful probe of jet substructure and multi-scale parton dynamics. A key challenge in jet quenching physics is to consistently model the transition between vacuum-like parton shower evolution at high virtuality and subsequent jet-medium interactions. Within the LIDO framework, this physics is governed by a critical cutoff scale $Q_0$ that separates high-virtuality vacuum-like splittings from subsequent medium-induced transport.
In this work, we use the LIDO hard parton transport model coupled to a simple ansatz for jet induced hydrodynamic response of the medium to study medium-modified parton showers via the EEC, with a particular emphasis on elucidating the impact of this vacuum-medium transition scale. We demonstrate that jet suppression exhibits markedly different sensitivities to the transition scale $Q_0$ between vacuum-like and medium-induced parton showers.
After calibrating the LIDO model to the jet $R_{AA}$, we first systematically investigate the impact of various model parameters on the energy-energy correlator (EEC). We find a pronounced dependence of the EEC on $Q_0$, demonstrating that its angular structure is highly sensitive to the modeling of the vacuum-medium transition and establishing the EEC as a promising observable to constrain the onset of medium effects in jet evolution. Guided by these insights, we further extend our study to investigate the EEC distributions and their ratios with respect to the p--p baseline across different collision systems, specifically in Pb--Pb ($\sqrt{s_{\mathrm{NN}}} = 5.02$~TeV), p--Pb ($\sqrt{s_{\mathrm{NN}}} = 5.02$~TeV), and O--O ($\sqrt{s_{\mathrm{NN}}} = 5.36$~TeV) collisions.
| Academic Status | I am a Ph.D. student |
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