Development and validation of HERWIG 7 tunes from CMS underlying-event measurements

Published on Apr 12, 2021in European Physical Journal C4.389
· DOI :10.1140/EPJC/S10052-021-08949-5
Albert M Sirunyan178
Estimated H-index: 178
(Yerevan Physics Institute),
Rudolf Fruehwirth77
Estimated H-index: 77
(Yerevan Physics Institute)
+ 2410 AuthorsKevin Sung171
Estimated H-index: 171
(NU: Northwestern University)
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Abstract
This paper presents new sets of parameters (“tunes”) for the underlying-event model of the ${\textsc {herwig}} \,7 event generator. These parameters control the description of multiple-parton interactions (MPI) and colour reconnection in {\textsc {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 \,\text {Te}\text {V} . 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.
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