Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Charge Asymmetry in W-Boson Decays Produced in p-pbar Collisions at
  sqrt(s) = 1.8 TeV   The charge asymmetry has been measured using $19,039~W$ decays recorded by
the CDF detector during the 1992-93 run of the Tevatron Collider. The asymmetry
is sensitive to the ratio of $d$ and $u$ quark distributions to $x<0.01$ at
$Q^2 \approx M_W^2$, where nonperturbative effects are minimal. It is found
that of the two current sets of parton distributions, those of Martin, Roberts
and Stirling (MRS) are favored over the sets most recently produced by the CTEQ
collaboration. The $W$ asymmetry data provide a stronger constraints on $d/u$
ratio than the recent measurements of $F_2^{\mu n}/F_2^{\mu p}$ which are
limited by uncertainties originating from deutron corrections.

30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph