Spin effects and baryon resonance dynamics in phi meson photoproduction at few GeV

May, 2003
39 pages
Published in:
  • Phys.Rev.C 67 (2003) 065205
e-Print:

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Abstract:
The diffractive ϕ\phi-meson photoproduction amplitude is dominated by the Pomeron exchange process and contains the terms that govern the spin-spin and spin-orbital interactions. We show that these terms are responsible for the spin-flip transitions at forward photoproduction angles and appear in the angular distributions of ϕK+K\phi\to K^+K^- -decay in reactions with unpolarized and polarized photon beams. At large momentum transfers, the main contribution to the ϕ\phi-meson photoproduction is found to be due to the excitation of nucleon resonances. Combined analysis of ω\omega and ϕ\phi photoproduction indicates strong OZI-rule violation in ϕNN\phi NN^* - couplings. We also show that the spin observables are sensitive to the dynamics of ϕ\phi-meson photoproduction at large angles and could help distinguish different theoretical models of nucleon resonances. Predictions for spin effects in ϕ\phi-meson photoproduction are presented for future experimental tests.
Note:
  • 39 pages, 21 figures. Submitted to the Physical Review C
  • 13.88.+e
  • 13.60.Le
  • 25.20.Lj
  • 14.20.Gk
  • photon p: exclusive reaction
  • photon: polarized beam
  • p: polarized target
  • diffraction
  • pomeron: exchange
  • Regge poles