Babacan, T.Babacan, H.Gökalp, A.Yılmaz, O.2018-08-092018-08-092000-10Babacan, T. ... [ve arkadaşları]., (2000). Photoproduction of vector mesons on nucleons: relative role of possible threshold mechanisms. I. Eurasia Conference on Nuclear Science and Its Application, Presentations, Vol 2, (s. 1028-1030). 23-27 October 2000. İzmir, Turkey.http://kurumsalarsiv.tenmak.gov.tr/handle/20.500.12878/832I. Avrasya Nükleer Bilimler ve Uygulamaları Konferansı : 23-27 Ekim 2000. İzmir, Türkiye.We analyze the photoproduction of co-meson on nucleons in order to understand the relative role of different possible threshold mechanisms. Therefore, we propose a set o f models with the different contributions of the exchange mechanisms which are equally good for the differential cross-section of γ+p→p+ω: pseudoscalar (π) and scalar exchanges (δ) in t-channel and the s+u nucleon term. We fit our model results to the experimental data about the differential crosssection in the energy ranges 1.4 GeV < E., <1.8 GeV and 1.8 GeV< E., < 2.5 GeV, simultaneously, and obtain some sets for the coupling constants, gTωNN an gVωNN. All calculations are done at Eγ = 1.6 GeV ( for the energy range 1.4 GeV < E., < 1.8 GeV ) , and Eγ = 2.2 GeV (for the energy range 1.8 GeV< Eγ< 2.5 GeV). We found some sensitivity of the differential cross-section on neutron targets and the beam asymmetry on proton and neutron targets as well, to the variations of the different models which are equivalently good for the differential cross-section on proton target.enginfo:eu-repo/semantics/openAccessNucleonsNükleonslarVector mesonsVektör mezonlarıPhotoproductionFotoprodüksiyonuRelative roleNispi rolPossible threshold mechanismsOlası eşik mekanizmalarıconferenceObject10281030