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

(CMS Collaboration) Sirunyan, A. M.; Tumasyan, A.; ..., ...; Antunović, Željko; Ferenček, Dinko; Brigljević, Vuko; Giljanović, Duje; Godinović, Nikola; Kovač, Marko; Lelas, Damir; Majumder, Devdatta; Mesić, Benjamin; Puljak, Ivica; Roguljić, Matej; Đurić, Senka; Šuša, Tatjana; Šćulac, Toni; Starodumov, Andrey; ..., ...; Vetens, W. (2021) Development and validation of HERWIG 7 tunes from CMS underlying-event measurements. European Physical Journal C: Particles and Fields, 81 (4). ISSN 1434-6052

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Abstract

This paper presents new sets 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 v s = 0.9, 7, and 13 TeV. The tunes are based on the NNPDF3.1 next-to-nextto-leading-order parton distribution function (PDF) set for the parton shower, and either a leading-order or next-to-nextto-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 forminimum-bias, inclusive jet, top quark pair, and Zand Wboson 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.

Item Type:	Article
Uncontrolled Keywords:	high energy physics; experimental particle physics; LHC; CMS; Hadron-Hadron scattering (experiments); Higgs physics; p p: colliding beams; Higgs particle: pair production; bottom: 2; p p: scattering; Higgs particle: coupling; Higgs particle: hadroproduction; Higgs particle: decay modes; bottom: pair productio ; photon: pair production; top: pair production; coupling: Yukawa; coupling constant: upper limit; vector boson: fusion; mass spectrum: two-photon; standard model
Subjects:	NATURAL SCIENCES NATURAL SCIENCES > Physics NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Division of Experimental Physics
Depositing User:	Virna Brumnić
Date Deposited:	25 Mar 2026 13:57
URI:	http://fulir.irb.hr/id/eprint/11478
DOI:	10.1140/epjc/s10052-021-08949-5

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