Systematic analysis of charmonium photoproduction
The available data on J/{Psi} photoproduction are analyzed in terms of pomeron exchange, two-gluon exchange and photon-gluon fusion models. Allowing the pomeron-quark interaction to be flavour-dependent and introducing both soft and hard pomerons it is possible to reproduce the data at {radical}s &g...
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Published in | Journal of physics. G, Nuclear and particle physics Vol. 30; no. 10; pp. 1427 - 1444 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
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Bristol
IOP Publishing
01.10.2004
Institute of Physics |
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Abstract | The available data on J/{Psi} photoproduction are analyzed in terms of pomeron exchange, two-gluon exchange and photon-gluon fusion models. Allowing the pomeron-quark interaction to be flavour-dependent and introducing both soft and hard pomerons it is possible to reproduce the data at {radical}s > 10 GeV and small |t|. The two-gluon exchange calculations indicate strong sensitivity to the gluon distribution function. The results obtained with the most modern MRST2001 and DL PDF reproduce the forward J/{Psi} photoproduction cross section at {radical}s > 10 GeV. The calculations with the photon-gluon fusion model and with MRST2001 and DL PDF are also in reasonable agreement with the data on the total J/{Psi} photoproduction cross section. However none of the models describe the data at {radical}s < 10 GeV or |t| {ge} 1 GeV{sup 2}. We attribute the J/{Psi} photoproduction at low energies and large |t| to a mechanism different from pomeron or two-gluon exchange. The authors consider that this might be the exchange of an axial vector trajectory that couples with the axial form factor of the nucleon. |
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AbstractList | The available data on J/{Psi} photoproduction are analyzed in terms of pomeron exchange, two-gluon exchange and photon-gluon fusion models. Allowing the pomeron-quark interaction to be flavour-dependent and introducing both soft and hard pomerons it is possible to reproduce the data at {radical}s > 10 GeV and small |t|. The two-gluon exchange calculations indicate strong sensitivity to the gluon distribution function. The results obtained with the most modern MRST2001 and DL PDF reproduce the forward J/{Psi} photoproduction cross section at {radical}s > 10 GeV. The calculations with the photon-gluon fusion model and with MRST2001 and DL PDF are also in reasonable agreement with the data on the total J/{Psi} photoproduction cross section. However none of the models describe the data at {radical}s < 10 GeV or |t| {ge} 1 GeV{sup 2}. We attribute the J/{Psi} photoproduction at low energies and large |t| to a mechanism different from pomeron or two-gluon exchange. The authors consider that this might be the exchange of an axial vector trajectory that couples with the axial form factor of the nucleon. |
Author | Krewald, S Sibirtsev, A Thomas, A W |
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Keywords | Particle exchange Charmonium Quarks Trajectories Photoproduction Form factors Flavor Pomerons Gluons Gluon model Nucleons Cross sections Mathematical physics Nuclear physics |
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Snippet | The available data on J/{Psi} photoproduction are analyzed in terms of pomeron exchange, two-gluon exchange and photon-gluon fusion models. Allowing the... |
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SubjectTerms | CHARMONIUM CROSS SECTIONS DISTRIBUTION FUNCTIONS Exact sciences and technology FORM FACTORS GLUONS Nuclear physics PHOTOPRODUCTION Physics PHYSICS OF ELEMENTARY PARTICLES AND FIELDS POMERANCHUK PARTICLES SENSITIVITY The physics of elementary particles and fields VECTORS |
Title | Systematic analysis of charmonium photoproduction |
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