Probing strangeness canonical ensemble with K−, ϕ(1020) and Ξ− production in Au+Au collisions at sNN=3 GeV

Abdallah, M.S.; Aboona, B.E.; Adam, J.; Adamczyk, L.; Adams, J.R.; Adkins, J.K.; Agakishiev, G.; Aggarwal, I.; Aggarwal, M.M.; Ahammed, Z.

doi:10.1016/j.physletb.2022.137152

Probing strangeness canonical ensemble with K−, ϕ(1020) and Ξ− production in Au+Au collisions at sNN=3 GeV

STAR

Collaboration

•

M.S. Abdallah
(
- American U., Cairo
)

Aug 2, 2021

9 pages

Published in:

Phys.Lett.B 831 (2022) 137152

Published: Aug 10, 2022

e-Print:

2108.00924 [nucl-ex]

DOI:

10.1016/j.physletb.2022.137152 (publication)

Experiments:

BNL-RHIC-STAR

View in:

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Abstract: (Elsevier B.V.)

We report the first multi-differential measurements of strange hadrons of

K^{-}

, ϕ and

Ξ^{-}

yields as well as the ratios of

ϕ / K^{-}

and

ϕ / Ξ^{-}

in Au+Au collisions at

\sqrt{s_{NN}} = 3 GeV

with the STAR experiment fixed target configuration at RHIC. The ϕ mesons and

Ξ^{-}

hyperons are measured through hadronic decay channels,

ϕ \to K^{+} K^{-}

and

Ξ^{-} \to Λ π^{-}

. Collision centrality and rapidity dependence of the transverse momentum spectra for these strange hadrons are presented. The 4π yields and ratios are compared to thermal model and hadronic transport model predictions. At this collision energy, thermal model with grand canonical ensemble (GCE) under-predicts the

ϕ / K^{-}

and

ϕ / Ξ^{-}

ratios while the result of canonical ensemble (CE) calculations reproduce

ϕ / K^{-}

, with the correlation length

r_{c} \sim 2.7

fm, and

ϕ / Ξ^{-}

,

r_{c} \sim 4.2

fm, for the 0-10% central collisions. Hadronic transport models including high mass resonance decays could also describe the ratios. While thermal calculations with GCE work well for strangeness production in high energy collisions, the change to CE at 3 GeV implies a rather different medium property at high baryon density.

Note:

9 pages, 5 figures, 2 tables

K-: production
Phi(1020): production
Xi-: production
conservation law: strangeness
model: thermal
hyperon: production
correlation: length
STAR
hadronic decay
transverse

References(69)

Figures(6)

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