Collision Energy Dependence of Hypertriton Production in Au+Au Collisions at RHIC
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arXiv
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866911608034295808 |
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| author | The STAR Collaboration |
| author_facet | The STAR Collaboration |
| contents | The STAR Collaboration reports measurements of the collision energy dependence of hypertriton (${}^{3}_Λ$H) transverse momentum spectra and $p_{\rm T}$-integrated yields at mid-rapidity ($|y|<$0.5) in Au+Au collisions at 11 collision energies between 3.2 and 27\,GeV. The measured ${}^{3}_Λ$H yields and ${}^{3}_Λ$H/$Λ$ yields ratio in central collisions increase strongly with decreasing collision energy, and are a factor of $\sim$2 lower than thermal model predictions at this energy range. The mean $p_{\rm T}$ of ${}^{3}_Λ$H is lower than the Blast-Wave expectation using the freeze-out parameters from light hadrons. Furthermore, the observed double ratio $({}^{3}_Λ{\rm{H}}/Λ)/(t/p)$ maintains a constant value of $\sim$0.4 across the measured energy range. Within the coalescence framework, this ratio directly reflects the significantly suppressed formation probability of the weakly-bound hypertriton relative to the triton, which results from the weaker hyperon-nucleon interaction compared with the nucleon-nucleon interaction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_18214 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Collision Energy Dependence of Hypertriton Production in Au+Au Collisions at RHIC The STAR Collaboration Nuclear Experiment High Energy Physics - Experiment The STAR Collaboration reports measurements of the collision energy dependence of hypertriton (${}^{3}_Λ$H) transverse momentum spectra and $p_{\rm T}$-integrated yields at mid-rapidity ($|y|<$0.5) in Au+Au collisions at 11 collision energies between 3.2 and 27\,GeV. The measured ${}^{3}_Λ$H yields and ${}^{3}_Λ$H/$Λ$ yields ratio in central collisions increase strongly with decreasing collision energy, and are a factor of $\sim$2 lower than thermal model predictions at this energy range. The mean $p_{\rm T}$ of ${}^{3}_Λ$H is lower than the Blast-Wave expectation using the freeze-out parameters from light hadrons. Furthermore, the observed double ratio $({}^{3}_Λ{\rm{H}}/Λ)/(t/p)$ maintains a constant value of $\sim$0.4 across the measured energy range. Within the coalescence framework, this ratio directly reflects the significantly suppressed formation probability of the weakly-bound hypertriton relative to the triton, which results from the weaker hyperon-nucleon interaction compared with the nucleon-nucleon interaction. |
| title | Collision Energy Dependence of Hypertriton Production in Au+Au Collisions at RHIC |
| topic | Nuclear Experiment High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2604.18214 |