$Λ$ and $Σ$ potentials in neutron stars, hypernuclei, and heavy-ion collisions
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866913654498131968 |
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| author | Jinno, Asanosuke Murase, Koichi Nara, Yasushi |
| author_facet | Jinno, Asanosuke Murase, Koichi Nara, Yasushi |
| contents | With an appropriate $YNN$ force, the $Λ$ single-particle potential ($Λ$ potential) can be made strongly repulsive at high density, and one can solve the hyperon puzzle of neutron stars. We investigate the consistency of such a $Λ$ potential, evaluated recently from $YN$ and $YNN$ forces based on chiral effective field theory, with hypernuclear data and heavy-ion collision data. It is found that model calculations with such a $Λ$ potential can reproduce the data of the $Λ$ hypernuclear spectroscopy and the $Λ$ directed flow in heavy-ion collisions. Also, we evaluate the $Σ$ potential, which can be calculated by using the same hyperon forces as for the $Λ$ potential. Specifically, we show that the low-energy constants characterizing the strength of the $YNN$ force can be chosen to suppress the appearance of the $Λ$'s in neutron stars while at the same time the empirical value of the $Σ$ potential is reproduced. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_09881 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | $Λ$ and $Σ$ potentials in neutron stars, hypernuclei, and heavy-ion collisions Jinno, Asanosuke Murase, Koichi Nara, Yasushi Nuclear Theory With an appropriate $YNN$ force, the $Λ$ single-particle potential ($Λ$ potential) can be made strongly repulsive at high density, and one can solve the hyperon puzzle of neutron stars. We investigate the consistency of such a $Λ$ potential, evaluated recently from $YN$ and $YNN$ forces based on chiral effective field theory, with hypernuclear data and heavy-ion collision data. It is found that model calculations with such a $Λ$ potential can reproduce the data of the $Λ$ hypernuclear spectroscopy and the $Λ$ directed flow in heavy-ion collisions. Also, we evaluate the $Σ$ potential, which can be calculated by using the same hyperon forces as for the $Λ$ potential. Specifically, we show that the low-energy constants characterizing the strength of the $YNN$ force can be chosen to suppress the appearance of the $Λ$'s in neutron stars while at the same time the empirical value of the $Σ$ potential is reproduced. |
| title | $Λ$ and $Σ$ potentials in neutron stars, hypernuclei, and heavy-ion collisions |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2501.09881 |