# A study of open-heavy-flavor, heavy-jet, and correlations using the LIDO transport model

- Institution: CERN
- Department: Conferences
- Speaker: Weiyao Ke
- Year: 2020
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3000801)
- 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)

Understanding heavy-flavor transport properties and energy loss inside a quark-gluon plasma (QGP) is a major interest of the heavy-ion phenomenology. In this work, we combine both open-heavy and heavy-flavor jet observables to study the average heavy quark energy loss as well as its fluctuations. Low-momentum heavy quark interacts with QGP mainly through elastic collisions; for high-momentum heavy quark, elastic collisions also induce radiative energy loss. Both energy loss mechanisms can be related to the heavy-quark momentum diffusion coefficient ($\hat{q}$). Recently, we have extracted a temperature and momentum-dependent $\hat{q}$ by comparing to open-heavy-flavor observables ($R_{AA}$ and $v_2$) using the LIDO transport model \[1,2\]. We find that even after the parameter calibration, the model still has a large degree of freedom to switch between a Boltzmann equation with large-angle perturbative scattering and a diffusion equation with effective transport coefficients. The reason is that inclusive open-heavy flavor observables are more sensitive to the average energy loss, but they are less efficient in discriminating models with different energy-loss fluctuations (e.g. large-angle scattering and diffusion). We argue that the fluctuation information can be studied using the heavy-flavor jet. First, we use the calibrated model to predict the charmed- and bottom-jet nuclear modification factor. Then, we study traces of the heavy-quark energy-loss fluctuations encoded in the angular and transverse momentum correlations between heavy flavor particles and jets. These observables help to understand heavy-quark-medium interaction in greater detail.

\[1\] W. Ke, Y. Xu, and S. A. Bass, Phys. Rev. C 98, 064901 (2018). \[2\] W. Ke, Y. Xu, and S. A. Bass, Phys. Rev. C 100, 064911 (2019)..

0:00:00 Slide 1

0:01:53 Slide 2

0:03:45 Slide 3

0:05:37 Slide 4

0:07:29 Slide 5

0:09:22 Slide 6

0:11:14 Slide 7

0:13:06 Slide 8

0:14:58 Slide 9

0:16:50 Slide 10

0:18:43 Slide 11

## Lectures

1. [A study of open-heavy-flavor, heavy-jet, and correlations using the LIDO transport model](https://invisiblenetwork.ai/learn/cern/3000801/a97b1a64faf9), 19 min (CERN's player)