Development and validation of HERWIG 7 tunes from CMS underlying-event measurements Academic Article uri icon


  • AbstractThis paper presents new sets of parameters (“tunes”) for the underlying-event model of the $${ extsc {herwig}} ,7$$ H E R W I G 7 event generator. These parameters control the description of multiple-parton interactions (MPI) and colour reconnection in $${ extsc {herwig}} ,7$$ 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 $$13 , ext {Te} ext {V} $$ 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.

altmetric score

  • 0.25

author list (cited authors)

  • Sirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Bergauer, T., Dragicevic, M., ... Vetens, W.

citation count

  • 0

publication date

  • April 2021