Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: xFitter 2.0.0: An Open Source QCD Fit Framework   xFitter is an open-source package that provides a framework for the
determination of the parton distribution functions (PDFs) of the proton for
many different kinds of analyses in Quantum Chromodynamics (QCD). xFitter
version 2.0.0 has recently been released, and offers an expanded set of tools
and options. It incorporates experimental data from a wide range of experiments
including fixed-target, Tevatron, HERA, and LHC. xFitter can analyze this data
up to next-to-next-to-leading-order (NNLO) in perturbation theory with a
variety of theoretical calculations including numerous methodological options
for carrying out PDF fits and plotting tools which help visualize the results.
While primarily based on the collinear factorization foundation, xFitter also
provides facilities for fits of dipole models and transverse-momentum dependent
(TMD) PDFs. The package can be used to study the impact of new precise
measurements from hadron colliders, and also assess the impact of future
colliders. This paper provides a brief overview of xFitter with emphasis of the
new version 2.0.0 features.

16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph