BARC/PUB/2021/0886

 
 

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

 
     
 
Author(s)

Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Dutta, D.; Jha, V.; V. Kumar; Mishra, D. K.; Naskar, K.; Netrakanti, P. K.; Pant, L. M.; Shukla, P.; and others
(NPD;PG)

Source

European Physical Journal-C, 2021. Vol. 81: Article no. 312

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 √s = 0.9, 7, and 13 TeV. The tunes are based on the NNPDF3.1 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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