Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the B+ production cross section in p-pbar collisions at
  sqrt(s) = 1960 GeV   We present a new measurement of the $B^+$ meson differential cross section
$d\sigma/d p_T$ at $\sqrt{s}=1960$ GeV. The data correspond to an integrated
luminosity of 739pb$^{-1}$ collected with the upgraded CDF detector (CDF II) at
the Fermilab Tevatron collider. $B^+$ candidates are reconstructed through the
decay $B^+ \to J/\psi K^+$, with $J/\psi \to \mu^+ \mu^-$. The integrated cross
section for producing $B^+$ mesons with $p_T \geq 6$ GeV/c and $|y| \leq 1$ is
measured to be $2.78 \pm 0.24 \mu$b

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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom