Quark Matter 2023

Measurements of proton-Λ and proton-Ξ− Correlation Functions in Au+Au Collisions from STAR Fixed-Target Experiment

5 Sept 2023, 17:30

2h 10m

Grand Ballroom, 4th floor ( Hilton of the Americas)

Poster QCD at finite density and temperature Poster Session

Speaker

Jing An (Central China Normal University)

Description

Two-particle correlation analyses are often used to study the spatial and temporal extents of the particle-emitting source in high-energy nuclear collisions. Information on the final state interactions amongst the particles under study can also be extracted from the measurement. For example, from the p-$\mathrm{\Lambda }$ and p-${\mathrm{\Xi }}^{-}$ correlation functions, one could study the hyperon-nucleon (Y-N) interactions in such collisions. It is particularly interesting to study the dependence on the collision energy of the source size at the moment of freeze-out. The STAR fixed-target program from $\sqrt{s_{\mathrm{N}\mathrm{N}}}=3.0$ to 7.7 GeV has enabled us to investigate the high baryon density region from ${\mu }_{\mathrm{B}}$ = 420 to 750 MeV.

In this poster, the first measurements of p-$\mathrm{\Lambda }$ and p-${\mathrm{\Xi }}^{-}$ correlation functions in Au + Au collisions at $\sqrt{s_{\mathrm{N}\mathrm{N}}}=3.2$, 3.5, and 3.9 GeV with the fixed-target mode from STAR will be presented. The results will be compared with the data from $\sqrt{s_{\mathrm{N}\mathrm{N}}}=3$ GeV Au + Au collisions (${\mu }_{\mathrm{B}}$ = 750 MeV) and the data from higher energies [1, 2], where ${\mu }_{\mathrm{B}}$ is close to 0, along with model calculations generated via the UrQMD hadronic transport model and CRAB afterburner.

References

[1] STAR, Phys. Rev. C 74, 064001 (2006)

[2] ALICE, Nature 588, 232–238 (2020)