Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Parton Distributions of the Proton   To obtain improved parton densities of the proton, we present a new global
analysis of deep inelastic and related data including, in particular, the
recent measurements of $F_2$ at HERA, of the asymmetry of the rapidity
distributions of $W^\pm$ production at the FNAL $pp$ collider and of the
asymmetry in Drell-Yan production in $pp$ and $pn$ collisions. We also
incorporate data to determine the flavour dependence of the quark sea
distributions. We find that the behaviour of the partons at small $x$ is
consistent with the precocious onset of BFKL leading $\log(1/x)$ dynamics. We
discuss the ambiguities remaining in the gluon distribution. We present
improved predictions for $W$ boson (and $t$ quark) production at the FNAL $\pp$
collider.

37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph