Antimatter $^4_��$H Hypernucleus Production and the $^3_��$H/$^3$He Puzzle in Relativistic Heavy-Ion Collisions
| Autor: | Sun, Kai-Jia, Chen, Lie-Wen |
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| Rok vydání: | 2015 |
| Předmět: | |
| DOI: | 10.48550/arxiv.1512.00692 |
| Popis: | We show that the measured yield ratio $^3_��$H/$^3$He ($^3_{\overline��}\overline{\text{H}}$/$^3\overline{\text{He}}$) in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV and in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV can be understood within a covariant coalescence model if (anti-)$��$ particles freeze out earlier than (anti-)nucleons but their relative freezeout time is closer at $\sqrt{s_{NN}}=2.76$ TeV than at $\sqrt{s_{NN}}=200$ GeV. The earlier (anti-)$��$ freezeout can significantly enhance the yield of (anti)hypernucleus $^4_��$H ($^4_{\overline��}\overline{\text{H}}$), leading to that $^4_{\overline��}\overline{\text{H}}$ has a comparable abundance with $^4\overline{\text{He}}$ and thus provides an easily measured antimatter candidate heavier than $^4\overline{\text{He}}$. The future measurement on $^4_��$H ($^4_{\overline��}\overline{\text{H}}$) would be very useful to understand the (anti-)$��$ freezeout dynamics and the production mechanism of (anti)hypernuclei in relativistic heavy-ion collisions. 7 pages, 4 figures, 2 tables. Significantly expanded to include some details and discussions. Accepted version to appear in PRC |
| Databáze: | OpenAIRE |
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