Nuclear Physics A ( IF 1.4 ) Pub Date : 2023-11-10 , DOI: 10.1016/j.nuclphysa.2023.122792 E.Ya. Paryev
We study the near-threshold meson photoproduction from protons and nuclei by considering incoherent direct non-resonant (, ) and two-step resonant (, , , 2, 3; , , ) bottomonium production processes with the main goal of clarifying the possibility to observe the non-strange hidden-bottom pentaquark states in this production via differential observables. We calculate the absolute excitation functions, energy and momentum distributions for the non-resonant, resonant and for the combined (non-resonant plus resonant) production of mesons on protons, on carbon and tungsten target nuclei at near-threshold incident photon beam energies by assuming the spin-parity assignments of the hypothetical hidden-bottom resonances , and as , and within four different realistic choices for the branching ratios of their decays to the and modes (0.125, 0.25, 0.5 and 1%) as well as for two options for the background contribution. We demonstrate that the measurements of these combined observables on proton and nuclear targets in the near-threshold energy region in future experiments at the planned high-luminosity electron-ion colliders EIC and EicC in the US and China should provide evidence for the existence of the above hidden-bottom pentaquark resonances as well as clarify their decay rates.