Speaker
Description
The suppression of high $p_T$ single hadron and dihadron productions in high-energy heavy-ion collisions at RHIC and the LHC energies is studied within a NLO pQCD model [1, 2]. The jet quenching effect is included via the medium-modified fragmentation functions based on the higher-twist energy loss formalism [3]. The evolution of the bulk medium is simulated by a (2+1)-dimensional viscous hydrodynamic model which has been tuned to describe the soft hadron production at RHIC and the LHC [4].
A global $\chi^2$ fit is performed for both single hadron $R_{AA}$ and dihadron $I_{AA}$ with the experimental data taken from ALICE, CMS, PHENIX and STAR Collaborations, and the jet transport coefficient $\hat q_0$ is quantitatively extracted for central A+A collisions at both RHIC and the LHC energies. Our results show that $\hat q_0$ extracted from dihadron suppression is consistent with single hadron suppression. We obtain, for energetic quarks, $\hat q_{0}\approx 1.1 \pm 0.3$ GeV$^2$/fm in central Au+Au collisions at RHIC, while $\hat q_{0}\approx 1.8 \pm 0.5$ GeV$^2$/fm in central Pb+Pb collisions at the LHC. Using the $\hat q_0$ values extracted from central A+A collisions, we obtain good description of the experimental data on single hadron $R_{AA}$ and dihadron $I_{AA}$ in non-central A+A collisions at $\sqrt{s_{\rm{NN}}}$ = 0.2 and 2.76 TeV. We also predict dihadron $I_{AA}$ at $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV using the $\hat{q}_0$ value extracted from single hadron $R_{AA}$.
References
[1] Hanzhong Zhang, J. F. Owens, Enke Wang, Xin-Nian Wang, Phys. Rev. Lett. 103, 032302 (2009).
[2] Zhi-Quan Liu, Hanzhong Zhang, Ben-Wei Zhang, Enke Wang, Eur. Phys. J. C 76, no. 1, 20 (2016).
[3] Xiao-feng Guo, Xin-Nian Wang, Phys. Rev. Lett. 85, 3591 (2000).
[4] Chun Shen, Zhi Qiu, Huichao Song, Jonah Bernhard, Steffen Bass, Ulrich Heinz, Com- put. Phys. Commun. 199, 61 (2016).
| Content type | Theory |
|---|---|
| Centralised submission by Collaboration | Presenter name already specified |
