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.
© The Author(s) 2021
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