Anisotropic fluctuations of momentum and angular momentum of heavy quarks in the pre-equilibrium stage of pA collisions at the LHC

We simulate the real-time evolution of the $SU(3)$-glasma generated in theearly stages of high-energy proton-nucleus collisions, employing classicallattice gauge theory techniques. Our setup incorporates a realistic modeling ofthe proton's internal structure and includes longitudinal fluctuations in theinitial state, enabling the study of genuinely non-boost-invariant collisiondynamics. Focusing on the momentum and angular momentum anisotropies of heavyquarks in the infinite mass limit, we find that the system retains significantanisotropy well beyond the characteristic timescale $\tau = 1/Q_s$. Thispersistence of anisotropy is further confirmed in the more realistic,non-boost-invariant scenario, across a range of fluctuation amplitudes. Thesefindings pave the way for future investigations involving dynamical heavyquarks and more quantitative initializations of the glasma.