Regular Article – Theoretical Physics
Elliptic flow of hadrons in equal-velocity quark combination mechanism in relativistic heavy-ion collisions
Department of Physics, Jining University, 273155, Shandong, China
2 School of Physics and Physical Engineering, Qufu Normal University, 273165, Shandong, China
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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