Eur. Phys. J. A (2024) 60: 15
https://doi.org/10.1140/epja/s10050-024-01240-7

Regular Article - Theoretical Physics

Molecular pentaquark states with open charm and bottom flavors

¹ School of Physics, Southeast University, 210094, Nanjing, China
² Department of Physics, Guangxi Normal University, 541004, Guilin, China
³ Guangxi Key Laboratory of Nuclear Physics and Technology, Guangxi Normal University, 541004, Guilin, China
⁴ Department of Physics and Hebei Key Laboratory of Photophysics Research and Application, Hebei Normal University, 050024, Shijiazhuang, China

^b hxchen@seu.edu.cn

Received: 17 October 2023
Accepted: 9 January 2024
Published online: 24 January 2024

Abstract

We study the possibly-existing molecular pentaquark states with open charm and bottom flavors, i.e., the states with the quark contents $c\overline{b}qqq$ and $b\overline{c}qqq$ ($q=u,d,s$). We investigate the meson-baryon interactions through the coupled-channel unitary approach within the local hidden-gauge formalism, and extract the poles by solving the Bethe-Salpeter equation in coupled channels. These poles qualify as molecular pentaquark states, which are dynamically generated from the meson-baryon interactions through the exchange of vector mesons. Our results suggest the existence of the ${\Sigma }_c^{(\ast )}{B}^{(\ast )}$ and ${\Sigma }_b^{(\ast )}{\overline{D}}^{(\ast )}$ molecular states with isospin $I=1/2$, the ${\Xi }_c^{(\prime ,\ast )}{B}^{(\ast )}$ and ${\Xi }_b^{(\prime ,\ast )}{\overline{D}}^{(\ast )}$ molecular states with isospin $I=0$ and $I=1$, as well as the ${\Omega }_c^{(\ast )}{B}^{(\ast )}$ and ${\Omega }_b^{(\ast )}{\overline{D}}^{(\ast )}$ molecular states with isospin $I=1/2$.