Description
Title: Coupled approach to solving the $𝐑_{𝐀𝐀}$ ⊗ $𝐯_𝟐$ puzzle and the collectivity in ultra-peripheral Pb+Pb collisions
Abstract: In the first part of the talk, we combine hydrodynamics, quark coalescence and jet quenching as well as the hadron cascade, and study their effects on hadron spectra and flow. 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 RAA and v2 along with their flavor dependence and hadron chemistry (proton-to-pion and kaon-to-pion ratios) from low to intermediate pT and high pT in heavy-ion collisions at both RHIC and LHC energies.
On the other hand, intriguing collectivity features in ultra-peripheral Pb+Pb collisions (UPCs) also have been measured at the LHC. I will also present the first full (3+1)D dynamical simulations of UPCs at the LHC. Extrapolating from p+Pb collisions, we provide hydrodynamic calculations for charged hadron multiplicity, identified particle mean transverse momenta, and anisotropic flow coefficients in gamma*+Pb collisions. The elliptic flow hierarchy between p+Pb and gamma*+Pb collisions is dominated by the difference in longitudinal flow de-correlations and reproduces the experimental data well. Our theoretical framework provides a quantitative tool to study collective behaviors for all system sizes, ranging from central heavy-ion collisions to small asymmetric systems and those at the future Electron-Ion Collider.
[1] Wenbin Zhao, Weiyao Ke, Wei Chen, Tan Luo and Xin-Nian Wang, Phys. Rev. Lett. 128 (2022) no.2, 022302.
[2] Wenbin Zhao, Che-Ming Ko, YuXin Liu, Guangyou Qin and Huichao Song, Phys. Rev. Lett. 125, 072301 (2020).
[3] Wenbin Zhao, Chun Shen and Björn Schenke, [arXiv: 2203.06094].
About the speaker: Wenbin Zhao is currently a postdoc at Wayne State University. He received his Ph.D degree at Peking University in 2020 and worked as a Research Assistant at CCNU during 2020 - 2021. His research covered many areas of heavy-ion collisions and mainly on the collectivity, hadronization process and light nuclei production in large and small systems.
