Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sensitivity of the parameters measured in pp collisions on the gluon PDF   The sphericity distribution in minimum bias events obtained with PYTHIA event
generator, incorporating different parton distribution functions is presented.
The results show that for minimum bias pp collisions the sphericity
distribution for different parameters like the mean transverse momentum and
multiplicity exhibit strong sensitivity on the parton distribution function
used. The results indicate that early data at the LHC could be used in this
type of analysis to fix the gluon distribution function in the proton.

12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an