12–16 Jul 2021
Europe/Zurich timezone
Due to the COVID-19 coronavirus pandemic, the ISMD2021 meeting has been moved online. We look forward to welcoming you in the Scottish Highlands next summer.

From hydro to jet quenching, coalescence and hadron cascade: a coupled approach to solving the $R_{AA}\otimes v_2$ puzzle in high-energy heavy-ion collisions

12 Jul 2021, 14:30
15m
Talk Collectivity and multiple-scattering Collectivity and multiple-scattering

Speaker

Wenbin Zhao (Central China Normal University)

Description

Hydrodynamic expansion and jet quenching are responsible for the production of low and high transverse-momentum ($p_T$) particle in heavy-ion collisions, respectively. However, it is still a challenge to simultaneously describe hadron nuclear modification factor $R_{AA}$ and elliptic flow $v_2$, especially in the intermediate $p_T$ region of 2<$p_T$<10 GeV/c. In this talk, besides hydrodynamics and jet quenching, we also study the effects of the quark coalescence and the hadron cascade on hadron spectra and flow. We find the key to solving the $R_{AA}\otimes v_2$ puzzle is the incorporation of quark coalescence into the state-of-the-art event-by-event simulations of heavy-ion collisions. Specifically, our new theoretical framework combines 1) the Coupled Linearized Boltzmann Transport and Hydrodynamic (CoLBT-Hydro) model, 2) a hadronization model including Cooper-Frye sampling, quark coalescence and string fragmentation, and 3) a hadron cascade model. For the first time, we can consistently describe and understand the experimental data on $R_{AA}$ and $v_2$ along with their flavor dependence and hadron chemistry (proton-to-pion and kaon-to-pion ratios) from low to intermediate $p_T$ and high $p_T$ in high-energy heavy-ion collisions. Our prediction is an example of high-precision tests of the quark coalescence model in nuclear collisions.
[1] Wenbin Zhao, Weiyao Ke, Wei Chen, Tan Luo and Xin-Nian Wang,arXiv:2103.14657 [hep-ph].
[2] Wenbin Zhao, Che-Ming Ko, YuXin Liu, Guangyou Qin and Huichao Song, Phys. Rev. Lett. 125, 072301 (2020).

Authors

Tan Luo (IGFAE) Weiyao Ke (University of California, Berkeley; Lawrence-Berkeley National ) Wenbin Zhao (Central China Normal University) Wei Chen (CCNU) Xin-Nian Wang (Lawrence Berkeley National Lab. (US))

Presentation materials