Indication of anomalous exchange in exclusive charmonium photoproduction
Abstract
We find that available data on J/ photoproduction at |t|1 GeV are energy independent over the range 22s170 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/ exclusive photoproduction data at large -t.
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