Wed·Dec 6, 2023Wednesday·December 6, 2023

1. 01*

   First-order event plane correlated directed and triangular flow from fixed-target energies at RHIC-STAR

   Sharang Rav Sharma🇮🇳

   We report the measurement of first-order event plane correlated directed flow $(v_1)$ and triangular flow $v_3$ for identified hadrons (${\pi }^{\pm }$, $K^{\pm }$, and $p$), net-particle (net-K, net-p), and light nuclei ($d$ and $t$) in Au+Au collisions at $\sqrt{s_{\text{NN}}}$ = 3.2, 3.5, and 3.9 GeV in fixed-target mode from the second phase of beam energy scan (BES-II) program at RHIC-STAR. The $v_1$ slopes at mid-rapidity for identified hadrons and net-particles except ${\pi }^{+}$ are found to be positive, implying the effect of dominant repulsive baryonic interactions. The slope of $v_1$ for net-kaon undergoes a sign change from negative to positive at a lower collision energy compared to net-proton. An approximate atomic mass number scaling is observed in the measured $v_1$ slopes of light nuclei at mid-rapidity, which favours the nucleon coalescence mechanism for the production of light nuclei. The $v_3$ slope for all particles decreases in magnitude with increasing collision energy, suggesting a notable integrated impact of the mean-field, baryon stopping, and collision geometry at lower collision energies.

   nucl-exhep-exhep-phUniverse(2024)·1 citation
2. 02*

   Hints of Entanglement Suppression in Hyperon-Nucleon Scattering

   Qiaofeng Liu🇺🇸 · Ian Low🇺🇸

   Hyperon ($Y=\Sigma ,\Lambda$)-nucleon ($N=n,p$) interactions are crucial for understanding the existence of neutron stars heavier than two solar masses. Amid renewed experimental efforts, we study $YN$ scatterings from the perspective of quantum information, focusing on whether spin entanglement is suppressed in the s-wave channel, which is observed in $np$ scattering and leads to enhanced global symmetries. Using global fits of phase shifts from experimental data, we find hints of entanglement suppression among the eight flavor channels in the strangeness $S=-1$ sector, similar to the $np$ case. One exception is the ${\Sigma }^{+}p$ channel, where conflicting global fits lead to inconclusive outcome. We then propose ''quantum'' observables in ${\Sigma }^{+}p$ scattering to help resolve the differing global fits.

   ↳ hep-phhep-exnucl-exnucl-th+1PLB(2024)·36 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.