Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Double spin asymmetry in diffractive $Q \bar Q$ production at SMC
  energies and quark-pomeron vertex structure   It is shown that the longitudinal double spin asymmetry $A_{ll}$ in polarized
diffractive $l p \to l p+Q \bar Q$ reaction depends strongly on the spin
structure of quark-pomeron vertex. The SMC spin facilities may be one of the
best place to perform such experiment.

10
The categories of this paper are: q-bio
2
The categories of this paper are: math
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph