Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Vector meson photoproduction processes near threshold   We discuss the photoproduction processes of light vector mesons ($\rho$,
$\omega$, and $\phi$) from the nucleon near threshold. We first develop a
simple model based on meson exchanges which is modified by the nucleon pole
terms. We then extend this model to study other physically interesting topics.
As examples, we discuss the missing nucleon resonances problem in $\omega$
photoproduction and the direct $\phi NN$ coupling constant in $\phi$
photoproduction. The calculated cross sections are compared with the recent
experimental data. Various spin observables are discussed, which may be
measured at current photon/electron facilities such as TJNAF and SPring-8 of
RCNP. Precise measurements of such quantities would provide very useful
information to understand the production mechanism.

24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math