Event generator tunes obtained from underlying event and multiparton scattering measurements

By V. Khachatryan, A. Sirunyan, A. Tumasyan, W. Adam, E. Asilar, T. Bergauer, J. Brandstetter, E. Brondolin, M. Dragicevic, J. Erö and 2,270 more. 2015

1,094 citations recorded by the source corpus.

New sets of parameters ("tunes") for the underlying-event (UE) modeling of the PYTHIA8, PYTHIA6 and HERWIG++ Monte Carlo event generators are constructed using different parton distribution functions. Combined fits to CMS UE proton-proton (pp) data at sqrt(s) = 7 TeV and to UE proton-antiproton (p p-bar) 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 of the UE tunes to"minimum bias"(MB) events, multijet, and Drell-Yan (q q-bar to Z / gamma* to lepton-antilepton + jets) observables at 7 and 8 TeV are presented, as well as predictions for MB and UE observables at 13 TeV.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/c90a98106815cf083b7f6acb03e5c31a7c95899f

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In Nuclear and High Energy Physics

Citations in the corpus

Charged-particle nuclear modification factors in PbPb and pPb collisions at √(s_N N) = 5.02 TeV (2017, background): “As described in section 3, the tracking corrections used in the analysis correspond to a particle species composition that lies halfway between that from pythia 8, tune CUETP8M1 and epos, tune LHC.”
Search for invisible decays of a Higgs boson produced through vector boson fusion in proton-proton collisions at $\sqrt{s} =$ 13 TeV (2018, methodology): “205 or higher for the simulation of fragmentation, parton showering, and the underlying event description, using the parameters from the CUETP8M1 tune [46].”
Measurements of properties of the Higgs boson decaying into the four-lepton final state in pp collisions at s=13$$ \sqrt{s}=13 $$ TeV (2017, background): “212 [42] tune CUETP8M1 [43] to simulate multiple parton interactions, the underlying event, and the fragmentation and hadronization effects.”
A measurement of the Higgs boson mass in the diphoton decay channel (2020, methodology): “The pythia underlying event tune CUETP8M1 [14] was used.”
Performance of the CMS muon detector and muon reconstruction with proton-proton collisions at √s=13 TeV (2018, methodology): “The PYTHIA 8.212 [21, 22] package is used for QCD events enriched in muon decays, parton showering, hadronization, and simulation of the underlying event via tune CUETP8M1 [23], using NNPDF2.”
Beyond the Standard Model Physics at the HL-LHC and HE-LHC (2018, positive): “0 parton distribution functions (PDFs) and the CUETP8M1 [658, 659] tune for all Monte Carlo processes, except for the tt̄ sample, which is produced with the CUETP8M2T4 [660] tune.”
Search for electroweak production of charginos and neutralinos in multilepton final states in proton-proton collisions at s=13$$ \sqrt{s}=13 $$ TeV (2017, background): “212 generator [60] with the CUETP8M1 tune [61, 62].”
Nuclear modification factor of D0 mesons in PbPb collisions at sNN=5.02TeV (2017, methodology): “Proton–proton collisions are generated with pythia 8 v212 [23] tune CUETP8M1 [24] and propagated through the CMS detector using the Geant4 package [25].”
Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV (2017, methodology): “PYTHIA 8.205 is also used for the parton showering and hadronization of all the simulated samples with the CMS underlying event tunes CUETP8M1 [30] using the NNPDF 2.3 [31] parton distribution functions.”
Performance of missing transverse momentum reconstruction in proton-proton collisions at √s = 13 TeV using the CMS detector (2019, methodology): “2 [20] using the CUETP8M1 tune [21] for the fragmentation, hadronization, and underlying event description.”