# High-energy probes of the initial stages in heavy-ion collisions

- Institution: CERN
- Department: TH institutes
- Speaker: Andrey Sadofyev
- Year: 2025
- Language: English
- Subjects: Earth and environment
- Source: [CERN](https://videos.cern.ch/record/3022432)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

The matter produced in heavy-ion collisions undergoes a multiphase evolution, providing unique access to a variety of QCD matter properties. Hard probes, which penetrate the medium and carry away imprints of different phases, serve as a key tool for studying this evolution. While their interaction with the medium in the very first moments after a collision was historically assumed to be negligible, recent studies suggest otherwise. In this talk, I will review how hard probes interact with nuclear matter from the earliest stages of a heavy-ion collision onward. Using jets as an example, I will discuss how they lose energy and how their substructure is modified during the pre-equilibrium phases, comparing these effects with their interactions in the later quark-gluon plasma stage. Understanding these early-time interactions provides new insights into the thermalization process and the microscopic structure of the QCD medium..

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## Lectures

1. [High-energy probes of the initial stages in heavy-ion collisions](https://invisiblenetwork.ai/learn/cern/3022432/8fb35ecefe1b), 52 min (CERN's player)