Jet shape modification at LHC energies by JEWEL Supported by National Natural Science Foundation of China (11505130, 11847014, 11775097 and CCNU18ZDPY04)
Ren-Zhuo Wan (
Nano Optical Material and Storage Device Research Center, School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan 430200, China); Lei Ding (
Nano Optical Material and Storage Device Research Center, School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan 430200, China); Xi Gui (
Nano Optical Material and Storage Device Research Center, School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan 430200, China); Fan Yang (
Nano Optical Material and Storage Device Research Center, School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan 430200, China); Shuang Li (
College of Science, China Three Gorges University, Yichang 443002, China); et al - Show all 6 authors
Jet shape measurements are employed to explore the microscopic evolution mechanisms of parton-medium interaction in ultra-relativistic heavy-ion collisions. In this study, jet shape modifications are quantified in terms of the fragmentation function
, relative momentum
, density of charged particles
, jet angularity
, jet momentum dispersion
, and
for proton-proton (pp) collisions at 0.9, 2.76, 5.02, 7, and 13 TeV, as well as for lead-lead collisions at 2.76 TeV and 5.02 TeV by JEWEL. A differential jet shape parameter
is proposed and studied at a smaller jet radius
. The results indicate that the medium has the dominant effect on jet shape modification, which also has a weak dependence on the center-of-mass energy. Jet fragmentation is enhanced significantly at very low
, and fragmented jet constituents are linearly spread to larger jet-radii for
. The waveform attenuation phenomena is observed in
,
, and
distributions. The results obtained for
from
to
, where the wave-like distribution in
collision is ahead of
collisions at small jet-radii, indicates a strong medium effect.
