The VII-th International Conference on the Initial Stages of High-Energy Nuclear Collisions : Initial Stages 2023

Hadronization effects on transverse momentum dependent jet fragmentation function in small systems

Not scheduled

20m

Copenhagen

Poster Collective dynamics from small to large systems

Speaker

Ms Xiang-Pan Duan (Fudan University)

Description

The transverse momentum $j_{\rm T}$-dependent jet fragmentation functions have been investigated in p $+$ p and p $+$ Pb collisions at $\sqrt{s_{\rm NN}} = 5.02~{\rm TeV}$ with a multiphase transport model [1] containing both the simple quark coalescence mechanism and a new hybrid hadronization mechanism with coalescence and fragmentation processes [2]. Hadronized by the new hadronization mechanism, the AMPT model achieves a quantitative description of the $j_{\rm T}$-dependent jet fragmentation functions measured by ALICE. Besides, no obvious jet-medium interaction and cold nuclear matter effects on the $j_{\rm T}$-dependent jet fragmentation functions in p $+$ Pb collisions were observed. We found the $j_{\rm T}$-dependent jet fragmentation functions are dominated by the quark coalescence contribution for the new hadronization mechanism, which can be decomposed into narrow and wide parts. The root-mean-square value of the wide part depends on the jet radius $R$ and jet transverse momentum $p_{\rm{T, jet}}$, which is sensitive to different hadronization mechanisms and their components. Similar studies are also implemented in longitudinal momentum jet fragmentation functions measured by CMS. The difference in the jet fragmentation functions between the two hadronization models indicates the importance of properly implementing the hadronization scheme to study the jet fragmentation functions in small systems [3].

References
[1] Z.-W. Lin, C. M. Ko, B.-A. Li, B. Zhang, and S. Pal, ''Multiphase transport model for relativistic heavy ion collisions'', Phys. Rev. C 72, 064901 (2005).
[2] W. Zhao, C. M. Ko, Y.-X. Liu, G.-Y. Qin, and H. Song, ''Probing the Partonic Degrees of Freedom in High-Multiplicity $p$-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV'', Phys. Rev. Lett. 125, 072301 (2020).
[3] X.-P. Duan, W. Zhao, and G.-L. Ma, ''Hadronization effects on transverse momentum dependent jet fragmentation function in small systems'', arXiv:2209.05689 [hep-ph].