Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of parton showers and parton distribution functions   Initial state evolution in parton shower event generators involves parton
distribution functions. We examine the probability for the system to evolve
from a higher scale to a lower scale without an initial state splitting. A
simple argument suggests that this probability, when multiplied by the ratio of
the parton distributions at the two scales, should be independent of the parton
distribution functions. We call this the PDF property. We examine whether the
PDF property actually holds using Pythia and Deductor. We also test a related
property for the Deductor shower and discuss the physics behind the results.

18
The categories of this paper are: econ
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph