Photoproduction of the ω meson on the proton has been experimentally studied near the threshold. The total cross sections are determined at incident energies ranging from 1.09 to 1.15 GeV. The 1/2 and 3/2 spin-averaged scattering length aωp and effective range rωp between the ω meson and proton are estimated from the shape of the total cross section as a function of the incident photon energy: aωp=(-0.97-0.16stat-0.00syst+0.16stat+0.03syst)+i(0.07-0.14stat-0.09syst+0.15stat+0.17syst) fm and rωp=(+2.78-0.54stat-0.12syst+0.67stat+0.11syst)+i(-0.01-0.50stat-0.00syst+0.46stat+0.06syst) fm, resulting in a repulsive force. The real and imaginary parts for aωp and rωp are determined separately for the first time. A small P-wave contribution does not affect the obtained values.
ASJC Scopus subject areas
- Nuclear and High Energy Physics