Indication of anomalous exchange in exclusive charmonium photoproduction

Details Indication of anomalous exchange in exclusive charmonium photoproduction Indication of anomalous exchange in exclusive charmonium photoproduction

2003-10-06

arxiv.org/abs/nucl-th/0310021v1

Physics

Nuclear Physics

Nuclear Theory

5 pages, 4 figures

Scientific paper

We find that available data on $J/\Psi$ photoproduction at $|t|{\ge}$1 GeV are energy independent over the range $22{\le}\sqrt{s}{\le}170$ GeV and show a very soft $t$ dependence. Through a systematic analysis of the data we detect a new trajectory, which manifests itself at threshold and is energy independent. The trajectory couples to the axial form factor of the nucleon and can reproduce the $J/\Psi$ exclusive photoproduction data at large -$t$.

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