Differential measurement of global polarization of Λ, Ξ, and Ω hyperons in Au+Au collisions at √(s_NN)=7.7--27 GeV from the RHIC Beam Energy Scan-II

@misc{collaboration2026differential,
  title = {{Differential measurement of global polarization of $Λ$, $Ξ$, and $Ω$ hyperons in Au+Au collisions at $\sqrts_\mathrmNN=7.7$--$27~\mathrmGeV$ from the RHIC Beam Energy Scan-II}},
  author = {The STAR Collaboration},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.03237},
  eprint = {2611.03237},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.03237},
  note = {CC BY-NC-ND 4.0},
}

TY  - UNPB
TI  - Differential measurement of global polarization of Λ, Ξ, and Ω hyperons in Au+Au collisions at √(s_NN)=7.7--27 GeV from the RHIC Beam Energy Scan-II
AU  - The STAR Collaboration
PY  - 2026
DA  - 2026/11/02
PB  - arXiv
DO  - 10.48550/arxiv.2611.03237
UR  - https://arxiv.org/abs/2611.03237
AB  - We present high-precision differential measurements of the global polarization of Λ, Ξ, and Ω hyperons in Au+Au collisions at √(s_NN)=7.7, $9.2$, $11.5$, $14.6$, $17.3$, $19.6$, and 27 GeV from the RHIC Beam Energy Scan Phase II (BES-II) using the STAR detector. The results show a clear centrality dependence, with polarization increasing toward more peripheral collisions. Within the present experimental precision, no significant dependence on transverse momentum is observed for Λ and Ξ, and no significant rapidity dependence is observed for the Ξ. The polarization of Ξ hyperons is comparable at the current precision to that of Λ hyperons, consistent with a picture in which all hyperons acquire polarization from the same global angular momentum source, with differences arising from quark content and hadronization dynamics. These high-precision, differential measurements across centrality and p_T over the measured energy ranges provide a unique test of spin--vorticity coupling and sensitivity to spin--spin correlations among hyperons with different quark content (uds, dss, and sss). The results are consistent, within current precision and under the stated spin-transfer assumptions, with a common vorticity-driven polarization mechanism across strange and multistrange hyperons. Consequently, they constrain the interplay of vorticity, magnetic fields, and quark-flavor dynamics in the produced medium.
ER  -