Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: J/$\psi$p Scattering Length from GlueX Threshold Measurements   The quality of the recent GlueX $J/\psi $ photoproduction data from Hall~D at
Jefferson Laboratory, and the proximity of the data to the energy threshold,
gives access to a variety of interesting physics aspects. As an example, an
estimation of the $J/\psi$-nucleon scattering length $\alpha_{J/\psi p}$ is
provided within the vector meson dominance model. It results in
$|\alpha_{J/\psi p}| = (3.08\pm 0.55 ({\rm stat.}) \pm 0.45 ({\rm
syst.}))$~mfm.

5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn