Measurements of strange and multi-strange hadrons elliptic flow in isobar collisions at RHIC by STAR
Abstract
We present measurements of elliptic flow ($v_{2}$) of $K_{s}^{0}$, $\Lambda$, $\bar{\Lambda}$, $\phi$, $\Xi^{-}$, $\overline{\Xi}^{+}$, and $\Omega^{-}$+$\overline{\Omega}^{+}$ at mid-rapidity ($|\eta| <$ 1.0) in isobar collisions ($^{96}_{44}$Ru+$^{96}_{44}$Ru and $^{96}_{40}$Zr+$^{96}_{40}$Zr) at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV. The centrality and transverse momentum ($p_{\mathrm{T}}$) dependence of elliptic flow is presented. The number of constituent quark (NCQ) scaling of $v_{2}$ in isobar collisions is discussed. $p_{T}$-integrated elliptic flow ($\left\langle v_{2}\right\rangle$) is observed to increase from central to peripheral collisions. The ratio of $\left\langle v_{2}\right\rangle$ between the two isobars shows a deviation from unity for strange hadrons ($K_{s}^{0}$, $\Lambda$ and $\bar{\Lambda}$) indicating a difference in nuclear structure and deformation. A system size dependence of strange hadron $v_{2}$ at high $p_{T}$ is observed among Ru+Ru, Zr+Zr, Cu+Cu, Au+Au, and U+U systems. A multi-phase transport (AMPT) model with string melting (SM) describes the experimental data well in the measured $p_{\mathrm{T}}$ range for isobar collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV.
- Publication:
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arXiv e-prints
- Pub Date:
- November 2023
- DOI:
- 10.48550/arXiv.2311.09698
- arXiv:
- arXiv:2311.09698
- Bibcode:
- 2023arXiv231109698B
- Keywords:
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- Nuclear Experiment;
- High Energy Physics - Experiment
- E-Print:
- 12 pages, 8 figures, 52nd International Symposium on Multiparticle Dynamics (ISMD-2023)