# Event generator tunes obtained from underlying event and multiparton scattering measurements

CMS Collaboration; Canelli, M Florencia; Chiochia, V; Kilminster, B; Robmann, P; et al (2016). Event generator tunes obtained from underlying event and multiparton scattering measurements. European Physical Journal C - Particles and Fields, 76(3):155.

## Abstract

New sets of parameters (“tunes”) for the underlying-event (UE) modelling of the PYTHIA8, PYTHIA6 and HERWIG++ Monte Carlo event generators are constructed using different parton distribution functions. Combined fits to CMS UE proton-proton ($p\overline{p}$) data at $\sqrt{s}$ = 7 TeV and to UE proton-antiproton (pp) data from the CDF experiment at lower $\sqrt{s}$, are used to study the UE models and constrain their parameters, providing thereby improved predictions for proton-proton collisions at 13 TeV. In addition, it is investigated whether the values of the parameters obtained from fits to UE observables are consistent with the values determined from fitting observables sensitive to double-parton scattering processes. Finally, comparisons are presented of the UE tunes to “minimum bias” (MB) events, multijet, and Drell–Yan ($q\overline{q}$ → Z/γ∗ → lepton-antilepton+jets) observables at 7 and 8 TeV, as well as predictions for MB and UE observables at 13 TeV.

## Abstract

New sets of parameters (“tunes”) for the underlying-event (UE) modelling of the PYTHIA8, PYTHIA6 and HERWIG++ Monte Carlo event generators are constructed using different parton distribution functions. Combined fits to CMS UE proton-proton ($p\overline{p}$) data at $\sqrt{s}$ = 7 TeV and to UE proton-antiproton (pp) data from the CDF experiment at lower $\sqrt{s}$, are used to study the UE models and constrain their parameters, providing thereby improved predictions for proton-proton collisions at 13 TeV. In addition, it is investigated whether the values of the parameters obtained from fits to UE observables are consistent with the values determined from fitting observables sensitive to double-parton scattering processes. Finally, comparisons are presented of the UE tunes to “minimum bias” (MB) events, multijet, and Drell–Yan ($q\overline{q}$ → Z/γ∗ → lepton-antilepton+jets) observables at 7 and 8 TeV, as well as predictions for MB and UE observables at 13 TeV.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics Physical Sciences > Engineering (miscellaneous) Physical Sciences > Physics and Astronomy (miscellaneous) English 2016 10 Jan 2017 09:33 11 Aug 2021 08:26 Springer 1434-6044 Gold Publisher DOI. An embargo period may apply. https://doi.org/10.1140/epjc/s10052-016-3988-x