Beam energy dependence of net-hyperon yield and its implication on baryon transport mechanism
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| Format: | Preprint |
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2024
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| _version_ | 1866916644559781888 |
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| author | Tsang, Chun Yuen Ma, Rongrong Tribedy, Prithwish Xu, Zhangbu |
| author_facet | Tsang, Chun Yuen Ma, Rongrong Tribedy, Prithwish Xu, Zhangbu |
| contents | 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, further substantiating the baryon junction picture. Various implementations of the \texttt{PYTHIA} event generator, primarily based on valence quarks for baryon transport, are unable to simultaneously describe the slope parameters for all baryons. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2409_06492 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Beam energy dependence of net-hyperon yield and its implication on baryon transport mechanism Tsang, Chun Yuen Ma, Rongrong Tribedy, Prithwish Xu, Zhangbu Nuclear Theory Nuclear Experiment 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, further substantiating the baryon junction picture. Various implementations of the \texttt{PYTHIA} event generator, primarily based on valence quarks for baryon transport, are unable to simultaneously describe the slope parameters for all baryons. |
| title | Beam energy dependence of net-hyperon yield and its implication on baryon transport mechanism |
| topic | Nuclear Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2409.06492 |