2020/07/01 by E. Ya. Paryev, Paryev, E. Ya., É. Ya. Paryev
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.48550/arxiv.2007.01172
18 pages, Chinese Physics C, accepted for publication, in press. arXiv admin note: text overlap with arXiv:2003.00788
arxiv created 2020/07/01 · openalex publication_date 2020/07/01 · arxiv updated 2020/07/03 · openalex created_date 2022/07/26 · openalex updated_date 2026/07/28
We study the Υ(1S) meson photoproduction on protons and nuclei at the near-threshold center-of-mass energies below 11.4 GeV (or at the corresponding photon laboratory energies Eγ below 68.8 GeV). We calculate the absolute excitation functions for the non-resonant and resonant photoproduction of Υ(1S) mesons off protons at incident photon laboratory energies of 63--68 GeV by accounting for direct (γp → Υ(1S)p) and two-step (γp → P+b(11080,11125,11130) → Υ(1S)p) Υ(1S) production channels within different scenarios for the non-resonant total cross section of elementary reaction γp → Υ(1S)p and for branching ratios of the decays P+b(11080,11125,11130) → Υ(1S)p. We also calculate an analogous functions for photoproduction of Υ(1S) mesons on 12C and 208Pb target nuclei in the near-threshold center-of-mass beam energy region of 9.0--11.4 GeV by considering respective incoherent direct (γN → Υ(1S)N) and two-step (γp → P+b(11080,11125,11130) → Υ(1S)p, γn → P0b(11080,11125,11130) → Υ(1S)n) Υ(1S) production processes within a nuclear spectral function approach. We show that a detailed scan of the Υ(1S) total photoproduction cross section on a proton and nuclear targets in the near-threshold energy region in future high-precision experiments at the proposed high-luminosity electron-ion colliders EIC and EicC in the U.S. and China should give a definite result for or against the existence of the non-strange hidden-bottom pentaquark states Pbi+ and Pbi0 (i=1, 2, 3) as well as clarify their decay rates.