Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A possible determination of the quark radiation length in cold nuclear
  matter   We calculate the differential Drell-Yan production cross section in
proton-nucleus collisions by including both next-to-leading order perturbative
effects and effects of the nuclear medium. We demonstrate that dilepton
production in fixed target experiments is an excellent tool to study
initial-state parton energy loss in large nuclei and to accurately determine
the stopping power of cold nuclear matter. We provide theoretical predictions
for the attenuation of the Drell-Yan cross section at large values of Feynman
$x_F$ and show that for low proton beam energies experimental measurements at
Fermilab's E906 can clearly distinguish between nuclear shadowing and energy
loss effects. If confirmed by data, our results may help determine the quark
radiation length in cold nuclear matter $X_0 \sim 10^{-13}$ m.

13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn