Quark-model search for compact $c\bar c uds$ pentaquark states
Fuente:
arXiv
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866911497719906304 |
|---|---|
| author | Hiyama, Emiko Hosaka, Atsushi Oka, Makoto Wolschin, Georg |
| author_facet | Hiyama, Emiko Hosaka, Atsushi Oka, Makoto Wolschin, Georg |
| contents | A potential quark model is used to search for a $P_{c\bar{c}s}^0=(c\bar{c}uds)^0$, $J^P=1/2^-$ pentaquark state that has recently been observed experimentally by the LHCb collaboration at 4338.2 MeV, with a width of 7.0 MeV and high statistical significance $>15σ$. Our model Hamiltonian reproduces the masses of the low-lying charmed and strange hadrons. We use the Gaussian expansion method {to solve the} five-body Schrödinger equation. Employing the real scaling method {including}
the relevant meson-baryon thresholds explicitly, sharp resonances are distinguished from the meson-baryon scattering states. We incorporate new color states of the color-octet meson and baryon configurations as well as the color-singlet configurations for the five-quark states. We find no $ J^P=1/2^-$ resonance close to the observed state, and also none in the $ J^P=3/2^-$ state. This increases the likelihood that $P^0_{c\bar{c}s}$ is a $Ξ_c\bar{D}$ hadronic molecule rather than a compact state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_18694 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quark-model search for compact $c\bar c uds$ pentaquark states Hiyama, Emiko Hosaka, Atsushi Oka, Makoto Wolschin, Georg High Energy Physics - Phenomenology A potential quark model is used to search for a $P_{c\bar{c}s}^0=(c\bar{c}uds)^0$, $J^P=1/2^-$ pentaquark state that has recently been observed experimentally by the LHCb collaboration at 4338.2 MeV, with a width of 7.0 MeV and high statistical significance $>15σ$. Our model Hamiltonian reproduces the masses of the low-lying charmed and strange hadrons. We use the Gaussian expansion method {to solve the} five-body Schrödinger equation. Employing the real scaling method {including} the relevant meson-baryon thresholds explicitly, sharp resonances are distinguished from the meson-baryon scattering states. We incorporate new color states of the color-octet meson and baryon configurations as well as the color-singlet configurations for the five-quark states. We find no $ J^P=1/2^-$ resonance close to the observed state, and also none in the $ J^P=3/2^-$ state. This increases the likelihood that $P^0_{c\bar{c}s}$ is a $Ξ_c\bar{D}$ hadronic molecule rather than a compact state. |
| title | Quark-model search for compact $c\bar c uds$ pentaquark states |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2512.18694 |