Speaker
Description
Study of light nuclei flow in heavy-ion collisions provides valuable insights
into their production mechanisms and the underlying collision dynamics, making it of
particular interest for both theoretical and experimental
research.
Previous measurements by the STAR experiment have shown the light nuclei directed
flow $v_1$ follow a mass number scaling at $\sqrt{s_{NN}}=$3 GeV[1].
At the same time there is a hint that the deuteron $v_1$ slope shows an
opposite sign compared to that of the proton at $\sqrt{s_{NN}}>$7.7 GeV,
which is in conflict with the nucleon coalescence picture[2].
In this talk, we will show measurements of directed and elliptic flow ($v_2$) for
light nuclei (deuteron, triton, $^{3}$He and $^{4}$He) in Au+Au collisions
at $\sqrt{s_{NN}}=$3.0-4.5 GeV,
along with new precision measurements of $v_1$
of deuterons and anti-deuterons at $\sqrt{s_{NN}}=$7.7-19.6 GeV by the
STAR experiment at RHIC from the Beam Energy Scan Phase - II.
The rapidity and transverse momentum dependence of flow will
be presented and compared with those of protons and anti-protons.
These results will also be discussed within the framework of
nucleon coalescence.
[1] M.S. Abdallah ${\it et\ al.}$ (STAR Collaboration),
Phys. Lett. B ${\bf 827}$, 136941 (2022)
[2] J. Adam ${\it et\ al.}$ (STAR Collaboration),
Phys. Lett. B ${\bf 102}$, 044906 (2020)
