Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the longitudinal spin asymmetries for weak boson
  production in proton-proton collisions at $\sqrt{s}$ = 510 GeV   We report new STAR measurements of the single-spin asymmetries $A_L$ for
$W^+$ and $W^-$ bosons produced in polarized proton--proton collisions at
$\sqrt{s}$ = 510 GeV as a function of the decay-positron and decay-electron
pseudorapidity. The data were obtained in 2013 and correspond to an integrated
luminosity of 250 pb$^{-1}$. The results are combined with previous results
obtained with 86 pb$^{-1}$. A comparison with theoretical expectations based on
polarized lepton-nucleon deep-inelastic scattering and prior polarized
proton--proton data suggests a difference between the $\bar{u}$ and $\bar{d}$
quark helicity distributions for $0.05 < x < 0.25$. In addition, we report new
results for the double-spin asymmetries $A_{LL}$ for $W^\pm$, as well as $A_L$
for $Z/\gamma^*$ production and subsequent decay into electron--positron pairs.

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The categories of this paper are: cs
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: math
22
The categories of this paper are: chao-dyn