Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Applicability of pion-nucleus Drell-Yan data in global analysis of
  nuclear parton distribution functions   Despite the success of modern nuclear parton distribution functions (nPDFs)
in describing nuclear hard-process data, they still suffer from large
uncertainties. One of the poorly constrained features is the possible asymmetry
in nuclear modifications of valence $u$ and $d$ quarks. We study the
possibility of using pion-nucleus Drell-Yan dilepton data as a new constraint
in the global analysis of nPDFs. We find that the nuclear cross-section ratios
from the NA3, NA10 and E615 experiments can be used without imposing
significant new theoretical uncertainties and, in particular, that these
datasets may have some constraining power on the $u$/$d$ -asymmetry in nuclei.

34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat