Abstract
We study tensor meson photoproduction outside of the resonance region, at beam energies of few GeVs. We build a model based on Regge theory that includes the leading vector and axial exchanges. We consider two determinations of the unknown helicity couplings, and fit to the recent a2 photoproduction data from CLAS. Both choices give a similar description of the a2 cross section, but result in different predictions for the parity asymmetries and the f2 photoproduction cross section. We conclude that new measurements of f2 photoproduction in the forward region are needed to pin down the correct production mechanism. We also extend our predictions to the 8.5 GeV beam energy, where current experiments are running.
Highlights
The lightest tensor meson multiplet is well established experimentally and theoretically [1,2,3] and fits well into the quark model
In this paper we studied tensor meson photoproduction in the 3–10 GeV beam energy range, based on a Regge model, with vector and axial exchanges
We predicted the f2 cross section and compared to f2 data extracted from a partial wave analysis of πþπ− photoproduction, by CLAS [7]
Summary
The lightest tensor meson multiplet is well established experimentally and theoretically [1,2,3] and fits well into the quark model. Given their relatively narrow width, light tensors can be used as a benchmark when searching for states which are less prominent in data, for example the JPC 1⁄4 1−þ exotic hybrid candidate [4,5]. In photoproduction both hybrids and tensors can be produced through vector and axial exchanges. We describe tensor meson photoproduction in the 3–10 GeV beam energy range with a model based on Regge pole exchanges. V, while several technical details are left to the Appendixes
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