Medium response from mini-jets and in-medium hadronization in relativistic heavy ion collisions

About

In ultra-relativistic heavy-ion collisions, partons with intermediate energy (5-10) GeV excite ripples as they travel through the Quark-Gluon Plasma (QGP). These ripples' effect on particle production phenomenology is not very well studied. In this work, we extend our previous work \cite{Ryu:2018ckh} and present study using a state-of-the-art hybrid framework that consists of the IP-Glasma pre-thermalization dynamics, viscous hydrodynamics (MUSIC), jet energy loss (MARTINI), and hadronic re-scatterings (UrQMD). This framework consistently handles both soft and hard physics involved in relativistic heavy ion collisions. We consider the energy loss of mini-jets, whose energy is between 5 to 10 GeV, and their induced medium excitation. The energy and momentum lost from the mini-jets are treated as either free-streaming wave-packets or causal diffusive perturbations of the hydrodynamic flow. They alter the energy-stress tensor evaluated on the particlization hypersurface during the hadronization as jet induced medium response. In addition, this approach uses a novel in-medium fragmentation where the color neutrality of a string is enforced locally. We quantify the importance of the medium response from mini-jets propagation and their in-medium hadronization on identified particle $p_T$-spectra and their flow anisotropic coefficients.

S. Ryu, S. McDonald, C. Shen, S. Jeon and C. Gale, ``Effects of hadronic rescattering in mini-jet production and energy loss at the LHC'' PoS High-pT 2017, 014 (2019). doi:10.22323/1.320.0014.

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