2026/07/16 by Yu-Xin Wan, Rui Chen, Fu-Lai Wang +1
#hep-ph
In this work, we perform a systematic investigation of the hidden-bottom molecular pentaquark states, encompassing both bound states and resonances, which originate from the P-wave interactions between ground-state bottom baryons (Λb, Σb(*)) and ground-state antibottom mesons (B(*)). Adopting the one-boson-exchange model and including the coupled-channel effects, we derive the effective potentials for all allowed quantum numbers I(JP) = 1/2(1/2+), 1/2(3/2+), 1/2(5/2+), 1/2(7/2+), 3/2(1/2+), 3/2(3/2+), 3/2(5/2+), and 3/2(7/2+). We then solve the coupled-channel Schrödinger equations to search for the bound-state solutions and perform the phase-shift analyses to identify resonance poles. Our results reveal a rich spectrum of positive-parity hidden-bottom molecular pentaquark candidates. In the isospin I=1/2 sector, we find several loosely bound states and associated resonances, particularly in the Σb B^* and Σb^* B^* channels, where the coupled-channel dynamics plays an essential role in their formation. In the isospin I=3/2 sector, the attraction is generally weaker because of the isospin factors. Nevertheless, we still obtain the loosely bound states and resonances, such as the Σb^* B^* states with JP=3/2+, 5/2+, and 7/2+. The prominence of high-spin partial waves, for instance the 6PJ components, underscores the importance of the spin-spin and tensor interactions. Our predictions provide a comprehensive and systematic spectrum of the P-wave hidden-bottom molecular pentaquark states and offer clear guidance for future experimental searches at LHCb and Belle~II.