Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on Heavy Meson Form Factors Derived from QCD Analyticity,
  Unitarity and Heavy Quark Spin Symmetry   Using the analytic properties of two-point functions in QCD, as well as
unitarity, bounds on the B meson form factor F(q^2) can be derived. Heavy quark
spin symmetry, correctly taken into account, is shown to improve these bounds
significantly.

22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an