https://doi.org/10.1140/epjc/s10052-020-08760-8
Regular Article – Theoretical Physics
Elliptic flow of hadrons in equal-velocity quark combination mechanism in relativistic heavy-ion collisions
1
Department of Physics, Jining University, 273155, Shandong, China
2
School of Physics and Physical Engineering, Qufu Normal University, 273165, Shandong, China
Received:
21
August
2020
Accepted:
13
December
2020
Published online:
6
January
2021
We apply a quark combination model with equal-velocity combination (EVC) approximation to study the elliptic flow (
) of hadrons in heavy-ion collisions in a wide collision energy range (
27–5020 GeV). Utilizing the simple relationship between of hadrons and those of quarks under EVC, we find that of up/down quarks obtained by experimental data of proton is consistent with that obtained by data of 
and 
. of strange quarks obtained by data of 
is consistent with that obtained by data of and , and at RHIC energies it is also consistent with that obtained by data of 
. This means that of these hadrons have a common quark-level source. Using data of 
, we obtain of charm quarks with 
GeV/c. We find that under EVC charm quark dominates of D mesons at low 
but light-flavor quarks significantly contribute to of D mesons in the range 
GeV/c. We predict of charmed baryons 
and 
which show a significant enhancement at intermediate due to the double contribution of light-flavor quarks. The properties of the obtained quark under EVC are studied and a regularity for of quarks as the function of 
is found.
This work is supported in part by the National Natural Science Foundation of China under Grant nos. 11975011, Shandong Province Natural Science Foundation under Grant nos. ZR2019YQ06 and ZR2019MA053, and Higher Educational Youth Innovation Science and Technology Program of Shandong Province (2019KJJ010)
© The Author(s) 2021
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