Medium effects on the electromagnetic form factors of the $ρ$ meson
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2025
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866917152896843776 |
|---|---|
| author | Hutauruk, Parada T. P. Mart, Terry Tsushima, Kazuo |
| author_facet | Hutauruk, Parada T. P. Mart, Terry Tsushima, Kazuo |
| contents | The dynamics of partons inside the light $ρ$ meson is found to be essential for its properties and internal structure, both in free space and in the nuclear medium. In this paper, we systematically investigate the in-medium structure changes of $ρ^+$ mesons within the covariant Nambu-Jona-Lasinio (NJL) model, utilizing the Schwinger proper-time regularization scheme. We solve the Bethe-Salpeter equations to guarantee the bound meson-state condition. At the quark level, the nuclear medium effects are also derived within the same NJL model to maintain a consistent approach with the in-medium $ρ^+$ meson electromagnetic form factors. To this end, we analyze the spacelike electromagnetic form factors of the $ρ^+$ meson in free space and in a nuclear medium. We find that the charge radius and quadrupole moment of the $ρ^+$ meson increase with increasing nuclear matter density, while the magnetic moment decreases, in agreement with the existing previous theoretical predictions. The enhancement of the $ρ^+$ meson charge radius at normal density relative to that in free space is about 11\% (0.08 fm), while the reduction of $ρ^+$ meson magnetic moment is about 8\% (0.20 $μ_N$). Our predictions for the charge radius, magnetic moment, and quadrupole moment of the $ρ^+$ meson in both free space and nuclear medium, remain challenging to be verified experimentally. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_20501 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Medium effects on the electromagnetic form factors of the $ρ$ meson Hutauruk, Parada T. P. Mart, Terry Tsushima, Kazuo Nuclear Theory High Energy Physics - Phenomenology The dynamics of partons inside the light $ρ$ meson is found to be essential for its properties and internal structure, both in free space and in the nuclear medium. In this paper, we systematically investigate the in-medium structure changes of $ρ^+$ mesons within the covariant Nambu-Jona-Lasinio (NJL) model, utilizing the Schwinger proper-time regularization scheme. We solve the Bethe-Salpeter equations to guarantee the bound meson-state condition. At the quark level, the nuclear medium effects are also derived within the same NJL model to maintain a consistent approach with the in-medium $ρ^+$ meson electromagnetic form factors. To this end, we analyze the spacelike electromagnetic form factors of the $ρ^+$ meson in free space and in a nuclear medium. We find that the charge radius and quadrupole moment of the $ρ^+$ meson increase with increasing nuclear matter density, while the magnetic moment decreases, in agreement with the existing previous theoretical predictions. The enhancement of the $ρ^+$ meson charge radius at normal density relative to that in free space is about 11\% (0.08 fm), while the reduction of $ρ^+$ meson magnetic moment is about 8\% (0.20 $μ_N$). Our predictions for the charge radius, magnetic moment, and quadrupole moment of the $ρ^+$ meson in both free space and nuclear medium, remain challenging to be verified experimentally. |
| title | Medium effects on the electromagnetic form factors of the $ρ$ meson |
| topic | Nuclear Theory High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2508.20501 |