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Résumé |
Jets are essential probes of the hot and dense nuclear matter produced in heavy-
ion collisions. While their propagation through the thermal quark–gluon plasma
(QGP) has been extensively studied, their interaction with the preceding
nonequilibrium stages remains less understood. Understanding these early
interactions requires accounting for both the dynamics of the medium and the
formation time scales associated with the jet’s initial virtuality.
We first investigate the Glasma, the earliest stage of the collision,
characterized by strong, nonequilibrium classical gluon fields. We develop a
light-front Hamiltonian framework to describe the real-time quantum evolution of
energetic probes through these fields. Within this framework, we compute their
transverse momentum broadening and compare our results with calculations based on
classical particle dynamics.
To address the complementary question of how the initial jet virtuality affects
its interaction with the medium, we develop a factorization framework that
incorporates virtuality effects into jet modification calculations using standard
perturbative techniques. As a first application, we calculate jet functions
differential in the initial virtuality and determine the corresponding transverse
momentum broadening and medium-induced radiation spectrum. These calculations
provide a basis for investigating how jet virtuality influences sensitivity to the
initial stages of heavy-ion collisions. |
