Speaker
Shanshan Cao
(Lawrence Berkeley National Lab)
Description
Heavy quarks are valuable probes of the dense nuclear matter produced in relativistic heavy-ion collisions. We establish a comprehensive framework that describes their entire temporal evolution in the QGP matter and the subsequent hadron gas. The dynamics of open heavy quarks in the QGP is described using either an improved Langevin approach [1,2] or a linearized Boltzmann approach [3] that both simultaneously incorporate the quasi-elastic scattering and medium-induced gluon radiation processes. The hadronization of heavy quarks into their mesonic bound states is calculated utilizing our hybrid model of fragmentation plus heavy-light quark coalescence [1,2]. And the final rescatterings of heavy hadrons inside the hadron gas are described using the UrQMD model.
Within this newly developed framework, we demonstrate that while quasi-elastic scattering dominates heavy quark energy loss in the QGP at low energies, contributions from gluon radiation at high energies are significant; and the coalescence process is found important for heavy meson production at intermediate $p_\rm{T}$. Our numerical results provide a good description of the $R_\rm{AA}$ and $v_2$ of both $D$ meson and $B$-decay non-prompt $J/\psi$ measured at RHIC and LHC.
In addition, two-particle correlation functions of heavy flavor are explored [4]. We show that while the nuclear modification of the $p_\rm{T}$ imbalance of $D-\bar{D}$ pairs reflects the total energy loss of heavy quarks, their angular correlations are sensitive to the detailed energy loss mechanisms. $D$-hadron correlations are also calculated and shown to be a potential observable quantifying the medium response to the energy deposited by hard probe particles.
[1] S. Cao, G.-Y. Qin, and S. A. Bass, Phys. Rev. C88, 044907 (2013).
[2] S. Cao, G.-Y. Qin, and S. A. Bass, arXiv: 1505.01413.
[3] Y. He, T. Luo, X.-N. Wang and Y. Zhu, Phys. Rev. C91 054908 (2015).
[4] S. Cao, G.-Y. Qin, and S. A. Bass, arXiv: 1505.01869.
Authors
Shanshan Cao
(Lawrence Berkeley National Lab)
Steffen A. Bass
(Duke University)
Xin-Nian Wang
(Lawrence Berkeley National Lab. (US))
