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

Jun 1, 2020, 1:15 PM


Oral Presentation Heavy Flavor and Quarkonia Parallel


Dr Weiyao Ke (University of California, Berkeley)


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).

Track Heavy Flavor and Quarkonia
Contribution type Contributed Talk

Primary authors

Dr Weiyao Ke (University of California, Berkeley) Wenkai Fan (Duke University) Prof. Steffen A. Bass (Duke University) Xin-Nian Wang (Central China Normal University (China)) / Lawrence Berkeley Na)

Presentation materials