Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: QCD measurements at the Tevatron   Selected quantum chromodynamics (QCD) measurements performed at the Fermilab
Run II Tevatron ppbar collider running at sqrt{s} = 1.96 TeV by CDF and D0
Collaborations are presented. The inclusive jet, dijet production and three-jet
cross section measurements are used to test perturbative QCD calculations,
constrain parton distribution function (PDF) determinations, and extract a
precise value of the strong coupling constant, alpha_s(m_Z) =
0.1161^{+0.0041}_{-0.0048}. Inclusive photon production cross-section
measurements reveal an inability of next-to-leading-order (NLO) perturbative
QCD (pQCD) calculations to describe low-energy photons arising directly in the
hard scatter. The diphoton production cross-sections check the validity of the
NLO pQCD predictions, soft-gluon resummation methods implemented in theoretical
calculations, and contributions from the parton-to-photon fragmentation
diagrams. Events with W/Z+jets productions are used to measure many kinematic
distributions allowing extensive tests and tunes of predictions from pQCD NLO
and Monte-Carlo event generators. The charged-particle transverse momenta (pT)
and multiplicity distributions in the inclusive minimum bias events are used to
tune non-perturbative QCD models, including those describing the multiple
parton interactions (MPI). Events with inclusive production of photon and 2 or
3 jets are used to study increasingly important MPI phenomenon at high pT,
measure an effective interaction cross section, sigma_eff = 16.4+- 2.3 mb, and
limit existing MPI models.

19
The categories of this paper are: eess
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org