Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Development and validation of HERWIG 7 tunes from CMS underlying-event
  measurements   This paper presents a new set of parameters ("tunes") for the
underlying-event model of the HERWIG 7 event generator. These parameters
control the description of multiple-parton interactions (MPI) and colour
reconnection in HERWIG 7, and are obtained from a fit to minimum-bias data
collected by the CMS experiment at $\sqrt{s} =$ 0.9, 7, and 13 TeV. The tunes
are based on the NNPDF 3.1 next-to-next-to-leading-order parton distribution
function (PDF) set for the parton shower, and either a leading-order or
next-to-next-to-leading-order PDF set for the simulation of MPI and the beam
remnants. Predictions utilizing the tunes are produced for event shape
observables in electron-positron collisions, and for minimum-bias, inclusive
jet, top quark pair, and Z and W boson events in proton-proton collisions, and
are compared with data. Each of the new tunes describes the data at a
reasonable level, and the tunes using a leading-order PDF for the simulation of
MPI provide the best description of the data.

15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con