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Light nuclei collectivity from √sNN = 3 GeV Au+Au collisions at RHIC

STAR Collaboration
; 
Surrow, Bernd
; 
Quintero, A.
; 
Quintero, A.
; 
Pokhrel, Babu
; 
Nam, Jae
; 
Lukow, N.S.
; 
Ghimire, Nirmal
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Journal article
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2022-02-04
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Physics
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http://hdl.handle.net/20.500.12613/9343
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http://dx.doi.org/10.1016/j.physletb.2022.136941
Abstract
In high-energy heavy-ion collisions, partonic collectivity is evidenced by the constituent quark number scaling of elliptic flow anisotropy for identified hadrons. A breaking of this scaling and dominance of baryonic interactions is found for identified hadron collective flow measurements in √sNN = 3 GeV Au+Au collisions. In this paper, we report measurements of the first- and second-order azimuthal anisotropic parameters, v1 and v2, of light nuclei (d, t, 3He, 4He) produced in √sNN = 3 GeV Au+Au collisions at the STAR experiment. An atomic mass number scaling is found in the measured v1 slopes of light nuclei at mid-rapidity. For the measured v2 magnitude, a strong rapidity dependence is observed. Unlike v2 at higher collision energies, the v2 values at mid-rapidity for all light nuclei are negative and no scaling is observed with the atomic mass number. Calculations by the Jet AA Microscopic Transport Model (JAM), with baryonic mean-field plus nucleon coalescence, are in good agreement with our observations, implying baryonic interactions dominate the collective dynamics in 3 GeV Au+Au collisions at RHIC.
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Elsevier
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Physics Letters B, Vol. 827
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