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

Understand

This paper presents a new set 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 $\sqrt{s} =$ 0.9, 7, and 13 TeV.
• 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.