Development and validation of HERWIG 7 tunes from CMS underlying-event measurements
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10052_2021_Article_8949.pdf
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Author(s)
Sirunyan, A. M
Tumasyan, A.
Adam, W.
Ambrogi, F.
Bergauer, T.
Dragicevic, M.
Erö, J.
Escalante Del Valle, A.
Frühwirth, R.
Jeitler, M.
Date Issued
April 12, 2021
Publisher
Springer Berlin Heidelberg
Citation
The European Physical Journal C. 2021 Apr 12;81(4):312
Version
Final published version
Abstract
Abstract
This paper presents new sets of parameters (“tunes”) for the underlying-event model of the
$${\textsc {herwig}} \,7$$
H
E
R
W
I
G
7
event generator. These parameters control the description of multiple-parton interactions (MPI) and colour reconnection in
$${\textsc {herwig}} \,7$$
H
E
R
W
I
G
7
, and are obtained from a fit to minimum-bias data collected by the CMS experiment at
$$\sqrt{s}=0.9$$
s
=
0.9
, 7, and
$$13 \,\text {Te}\text {V} $$
13
Te
. 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-021-08949-5
