Photoproduction of vector mesons on nucleons: relative role of possible threshold mechanisms
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Date
2000-10
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Turkish Atomic Energy Authority
Abstract
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.
Description
I. Avrasya Nükleer Bilimler ve Uygulamaları Konferansı : 23-27 Ekim 2000. İzmir, Türkiye.
Keywords
Nucleons, Nükleonslar, Vector mesons, Vektör mezonları, Photoproduction, Fotoprodüksiyonu, Relative role, Nispi rol, Possible threshold mechanisms, Olası eşik mekanizmaları
Citation
Babacan, 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.