Beam energy dependence of net-hyperon yield and its implication on baryon transport mechanism

Tsang, Chun Yuen; Ma, Rongrong; Tribedy, Prithwish; Xu, Zhangbu

doi:10.1016/j.physletb.2024.139205

Title: Beam energy dependence of net-hyperon yield and its implication on baryon transport mechanism

Journal Article · 17 December 2024 · Physics Letters. B

DOI: https://doi.org/10.1016/j.physletb.2024.139205 · OSTI ID:2482559

^[1]; Ma, Rongrong ^[2]; Tribedy, Prithwish ^[2]; Xu, Zhangbu ^[1]

Kent State University, OH (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States)

In the constituent quark model, each quark inside a baryon carries 1/3 unit of the baryon number. An alternative picture exists where the center of a Y-shaped topology of gluon fields, called the baryon junction, carries a unit baryon number. Studying baryon transport over a large rapidity gap (δy) in nuclear collisions provides a possible tool to distinguish these two pictures. A recent analysis of global data on net-proton yield at mid-rapidity in Au+Au collisions showed an exponential dependence on δy and the exponential slope does not vary with event centrality, favoring the baryon junction picture. Since junctions are flavor blind, hyperons – baryons containing valence strange quarks – are expected to exhibit a similar behavior as the proton. This study aims to test this prediction by analyzing hyperon yields in Au+Au collisions at various energies. We observe that net-hyperon yields, after correcting for the strangeness production suppression, adhere to the expected exponential form. The extracted slope parameters for net-Λ, net-$$Ξ$$ and net-Ω are consistent with each other and with those of net-proton within uncertainties, and exhibit no centrality dependence. Various implementations of the PYTHIA event generator, primarily based on valence quarks for baryon transport, are unable to simultaneously describe the slope parameters for all baryons.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Kent State University, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-98CH10886; FG02-89ER40531; SC0005131; SC0012704

OSTI ID:: 2482559

Report Number(s):: BNL-226443-2024--JAAM

Journal Information:: Physics Letters. B, Journal Name: Physics Letters. B Vol. 860; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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