# Gradient Tomography of Jet Quenching in Heavy-ion Collisions

- Institution: CERN
- Department: Conferences
- Speaker: Xin-Nian Wang
- Year: 2020
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3007273)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

Transverse momentum broadening and energy loss of a propagating parton are dictated by the space-time profile of the jet transport coefficient $\hat q$ in dense QCD medium. Spatial gradient of $\hat q$ perpendicular to the propagation direction can lead to a drift and asymmetry in parton transverse momentum distribution. Such an asymmetry depends on both the spatial position along the transverse gradient and path length of a propagating parton as shown by numerical solutions of the Boltzmann transport in the simplified form of a drift-diffusion equation. In high-energy heavy-ion collisions, this asymmetry with respect to a plane defined by the beam and trigger particle (photon, hadron or jet) with a given orientation relative to the event plane is shown to be closely related to the transverse position of the initial jet production in full event-by-event simulations within the linear Boltzmann transport model. Such a gradient tomography can be used to localize the initial jet production position for more detailed study of jet quenching and properties of the quark-gluon plasma along a given propagation path in heavy-ion collisions..

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## Lectures

1. [Gradient Tomography of Jet Quenching in Heavy-ion Collisions](https://invisiblenetwork.ai/learn/cern/3007273/2db304db0983), 21 min (CERN's player)