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In the pre-thermal equilibrium stage of relativistic heavy-ion collisions, a strong quasi-classical transverse gluon field emerges at about $\tau_0 \simeq 0.1 \, \rm fm/c$ and evolves together with their longitudinal counterparts according…

We investigate the build-up of elliptic flow of charm quarks produced in the early pre-equilibrium stage of high-energy proton--nucleus collisions. The initial stage is modeled within the Color Glass Condensate framework as an evolving…

High Energy Physics - Phenomenology · Physics 2026-03-24 Gabriele Parisi , Fabrizio Murgana , Vincenzo Greco , Marco Ruggieri

We study the diffusion of charm and beauty in the early stage of high energy nuclear collisions at RHIC and LHC energies, considering the interaction of these heavy quarks with the evolving Glasma by means of the Wong equations. In…

Nuclear Theory · Physics 2020-10-13 J. H. Liu , S. Plumari , S. K. Das , V. Greco , M. Ruggieri

Relativistic nuclear collisions offer a unique way to study strong interactions at very high energy. The collision process can be described within the gluon saturation framework as the interaction of two colored glasses, and because of this…

Nuclear Theory · Physics 2018-12-05 Marco Ruggieri , Santosh Kumar Das

We study the diffusion of charm quarks in the early stage of high energy nuclear collisions at the RHIC and the LHC. The main novelty of the present study is the introduction of the color current carried by the heavy quarks that propagate…

High Energy Physics - Phenomenology · Physics 2021-03-03 Jun-Hong Liu , Santosh K. Das , Vincenzo Greco , Marco Ruggieri

We study the transverse momentum, $p_T$, broadening of charm and beauty quarks in the early stage of high energy nuclear collisions. We aim to compare the diffusion in the evolving Glasma fields with that of a standard, Markovian-Brownian…

High Energy Physics - Phenomenology · Physics 2021-10-28 Pooja , Santosh K. Das , Lucia Oliva , Marco Ruggieri

We investigate the effect of the glasma classical color fields, produced in the very early stage of heavy-ion collisions, on the transport of heavy quarks. The glasma fields evolve according to the classical Yang-Mills equations, while the…

High Energy Physics - Phenomenology · Physics 2025-04-03 Dana Avramescu , Vincenzo Greco , Tuomas Lappi , Heikki Mäntysaari , David. I. Müller

We study the phenomenological impact of the pre-equilibrium glasma initial stage of heavy-ion collisions on heavy quark azimuthal correlations and spectra. Using our numerical solver, we simulate the transport of heavy quark test particles…

High Energy Physics - Phenomenology · Physics 2025-05-01 Dana Avramescu , Vincenzo Greco , Tuomas Lappi , Heikki Mäntysaari , David Müller

Collisions among heavy ions, like Pb or Au, are a great tool to study the theory of strong interactions, that is Quantum Chromodynamics (QCD). In particular, these experiments are able to give insights on all the complex phases of matter…

High Energy Physics - Phenomenology · Physics 2026-01-21 Gabriele Parisi

We study the impact of the Glasma fields, used to describe the very early stage of heavy-ion collisions, on the transport of hard probes, namely heavy quarks and jets. We perform numerical simulations of the strong classical fields using…

High Energy Physics - Phenomenology · Physics 2023-07-18 Dana Avramescu , Virgil Băran , Vincenzo Greco , Andreas Ipp , David. I. Müller , Marco Ruggieri

We present phenomenological findings on charm quark transport while including its energy loss in both pre-equilibrium and hydrodynamic stages of the evolution. We employed the MARTINI event generator for the production and evolution of…

High Energy Physics - Phenomenology · Physics 2024-09-24 Charles Gale , Sangyong Jeon , Manu Kurian , Björn Schenke , Mayank Singh

We calculate rapidity and transverse momentum distributions of charmonium formed in high energy heavy ion collsions from incoherent recombination of charm quarks. The results are very sensitive to the corresponding distributions of the…

Nuclear Theory · Physics 2009-11-11 R. L. Thews , M. L. Mangano

We calculate the balance function for charm in relativistic heavy-ion collisions. The distribution of pairs of charm-anticharm quarks produced in hard processes in the early stages of the nucleus-nucleus collision evolves in the dense…

Nuclear Theory · Physics 2024-02-21 Tribhuban Parida , Piotr Bozek , Sandeep Chatterjee

We study the effect of the glasma fields, formed in the early stage of heavy-ion collisions, on the transport of $Q\bar{Q}$ pairs produced back-to-back. We find that for pairs with moderate initial transverse momentum $p_T$ evolving in…

High Energy Physics - Phenomenology · Physics 2025-09-30 Dana Avramescu , Vincenzo Greco , Tuomas Lappi , Heikki Mäntysaari , David I. Müller

We study charm production in ultra-relativistic heavy-ion collisions by using the Parton-Hadron-String Dynamics (PHSD) transport approach. The initial charm quarks are produced by the Pythia event generator tuned to fit the transverse…

Heavy quarks, which are produced at the earliest stage of relativistic heavy-ion collisions, probe the entire history of the quark-gluon plasma that is created in the collision. Initially the plasma is populated with chromodynamic fields…

Nuclear Theory · Physics 2020-06-24 Margaret E. Carrington , Alina Czajka , Stanislaw Mrowczynski

Heavy quarks are predominantly generated at the initial stage of relativistic heavy-ion collisions such that heavy flavor observables have the potential to provide information on the pre-equilibrium medium dynamics. In this study, we…

Nuclear Theory · Physics 2026-02-13 Mayank Singh , Manu Kurian , Björn Schenke , Sangyong Jeon , Charles Gale

Lattice Quantum Chromodynamics (QCD) calculation predicts that a colour-deconfined QCD matter, Quark-Gluon Plasma (QGP), is formed at high temperature and energy density reached in ultra-relativistic heavy-ion collisions. Heavy quarks…

High Energy Physics - Experiment · Physics 2020-01-08 Daichi Kawana

We study charm production in ultra-relativistic heavy-ion collisions by using the Parton-Hadron-String Dynamics (PHSD) transport approach. The initial charm quarks are produced by the PYTHIA event generator tuned to fit the transverse…

Nuclear Theory · Physics 2016-02-17 E. L. Bratkovskaya , T. Song , H. Berrehrah , D. Cabrera , J. M. Torres-Rincon , L. Tolos , W. Cassing

The study of jets in heavy-ion collisions provides important information about the interaction of partons with the medium that they traverse. The seeds of jets are highly energetic partons, which are produced from hard scatterings during…

High Energy Physics - Phenomenology · Physics 2021-11-08 Andreas Ipp , David I. Müller , Daniel Schuh
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