Indication of anomalous exchange in exclusive charmonium photoproduction

Sibirtsev, A.; Krewald, S.; Thomas, A. W.

Indication of anomalous exchange in exclusive charmonium photoproduction

Authors

Sibirtsev, A.

Krewald, S.

Thomas, A. W.

Description

We find that available data on $J/Ψ$ 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 $J/Ψ$ exclusive photoproduction data at large -$t$.
5 pages, 4 figures