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Title: Event generator tunes obtained from underlying event and multiparton scattering measurements

Journal Article · · European Physical Journal. C, Particles and Fields
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Here, 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 ( $$\mathrm {p}\mathrm {p}$$ ) data at $$\sqrt{s} = 7\,\text {TeV} $$ and to UE proton–antiproton ( $$\mathrm {p}\overline{\mathrm{p}} $$ ) 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 $$\,\text {TeV}$$ . 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 ( $$ \mathrm{q} \overline{\mathrm{q}} \rightarrow \mathrm{Z}/ \gamma ^* \rightarrow $$ lepton-antilepton+jets) observables at 7 and 8 $$\,\text {TeV}$$ , as well as predictions for MB and UE observables at 13 $$\,\text {TeV}$$ .

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Organization:
CMS Collaboration
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1244514
Report Number(s):
FERMILAB-PUB--15-595-CMS; CMS-GEN--14-001; CERN-PH-EP--2015-291; arXiv:1512.00815; 1407839
Journal Information:
European Physical Journal. C, Particles and Fields, Journal Name: European Physical Journal. C, Particles and Fields Journal Issue: 3 Vol. 76; ISSN 1434-6044
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Measurement of the triple-differential dijet cross section in proton-proton collisions at $$\sqrt{s}=8\,\text {TeV} $$ s = 8 TeV and constraints on parton distribution functions journal November 2017
Search for dark matter produced in association with heavy-flavor quark pairs in proton-proton collisions at $$\sqrt{s}= 13\,\text{TeV} $$ s = 13 TeV journal December 2017
Measurements of the $$\mathrm {p}\mathrm {p}\rightarrow \mathrm{Z}\mathrm{Z}$$ p p → Z Z production cross section and the $$\mathrm{Z}\rightarrow 4\ell $$ Z → 4 ℓ branching fraction, and constraints on anomalous triple gauge couplings at $$\sqrt{s} = 13\,\text {TeV} $$ s = 13 TeV journal February 2018
Search for new physics in events with a leptonically decaying Z boson and a large transverse momentum imbalance in proton–proton collisions at $$\sqrt{s} $$ s = 13 $$\,\text {TeV}$$ TeV journal April 2018
Azimuthal correlations for inclusive 2-jet, 3-jet, and 4-jet events in pp collisions at $$\sqrt{s}= 13~\hbox {TeV}$$ s = 13 TeV journal July 2018
Electroweak production of two jets in association with a Z boson in proton–proton collisions at $$\sqrt{s}= $$ s = 13 $$\,\text {TeV}$$ TeV journal July 2018
Search for third-generation scalar leptoquarks decaying to a top quark and a $$\tau $$ τ lepton at $$\sqrt{s}=13\,\text {Te}\text {V} $$ s = 13 Te journal September 2018
Measurement of charged particle spectra in minimum-bias events from proton–proton collisions at $$\sqrt{s}=13\,\text {TeV} $$ s = 13 TeV journal August 2018
Measurement of the $$\mathrm {Z}/\gamma ^{*} \rightarrow \tau \tau $$ Z / γ ∗ → τ τ cross section in pp collisions at $$\sqrt{s} = 13 \hbox { TeV}$$ s = 13 TeV and validation of $$\tau $$ τ lepton analysis techniques journal September 2018
Measurement of the weak mixing angle using the forward–backward asymmetry of Drell–Yan events in $$\mathrm {p}\mathrm {p}$$ p p collisions at 8 $$\,\text {TeV}$$ TeV journal September 2018
Measurement of differential cross sections for $${\text {Z}}$$ Z boson production in association with jets in proton-proton collisions at $$\sqrt{s} = 13\,\text {TeV} $$ s = 13 TeV journal November 2018
Measurement of differential cross sections for inclusive isolated-photon and photon+jet production in proton-proton collisions at $$\sqrt{s} = 13\,\text {TeV} $$ s = 13 TeV journal January 2019
Search for single production of vector-like quarks decaying to a top quark and a $$\mathrm {W} $$ W boson in proton–proton collisions at $$\sqrt{s} = 13 \,\text {TeV} $$ s = 13 TeV journal January 2019
Study of the underlying event in top quark pair production in $$\mathrm {p}\mathrm {p}$$ p p collisions at 13 $$~\text {Te}\text {V}$$ Te journal February 2019
Search for dark matter produced in association with a Higgs boson decaying to a pair of bottom quarks in proton–proton collisions at $$\sqrt{s}=13\,\text {Te}\text {V} $$ s = 13 Te journal March 2019
Measurement of associated production of a $$\mathrm {W}$$ W boson and a charm quark in proton–proton collisions at $$\sqrt{s} = 13\,\text {Te}\text {V} $$ s = 13 Te journal March 2019
Search for resonant production of second-generation sleptons with same-sign dimuon events in proton–proton collisions at $$\sqrt{s} = 13\,\text {TeV} $$ s = 13 TeV journal April 2019
Search for vector-like quarks in events with two oppositely charged leptons and jets in proton–proton collisions at $$\sqrt{s} = 13\,\text {Te}\text {V} $$ s = 13 Te journal April 2019
Measurement of the $${\mathrm {t}\overline{\mathrm {t}}}$$ t t ¯ production cross section, the top quark mass, and the strong coupling constant using dilepton events in pp collisions at $$\sqrt{s}=13\,\text {Te}\text {V} $$ s = 13 Te journal April 2019
Search for supersymmetry in events with a photon, jets, $$\mathrm {b}$$ b -jets, and missing transverse momentum in proton–proton collisions at 13 $$\,\text {Te}\text {V}$$ Te journal May 2019
Search for a heavy pseudoscalar boson decaying to a Z and a Higgs boson at $$\sqrt{s}=13\,\text {Te}\text {V} $$ s = 13 Te journal July 2019
Measurement of electroweak production of a $$\mathrm{W} $$W boson in association with two jets in proton–proton collisions at $$\sqrt{s}=13\,\text {Te}\text {V} $$s=13Te journal January 2020
Search for production of four top quarks in final states with same-sign or multiple leptons in proton–proton collisions at $$\sqrt{s}=13$$ $$\,\text {TeV}$$ journal January 2020
Search for direct pair production of supersymmetric partners to the $${\uptau }_{}^{}$$τ lepton in proton–proton collisions at $$\sqrt{s}=13\,\text {TeV} $$s=13TeV journal March 2020
A multi-dimensional search for new heavy resonances decaying to boosted $$\text{ W }{}{}$$W $$\text{ W }{}{}$$W , $$\text{ W }{}{}$$W $$\text{ Z }{}{}$$Z , or $$\text{ Z }{}{}$$Z $$\text{ Z }{}{}$$Z boson pairs in the dijet final state at 13 $$\text {Te}\text {V}$$Te journal March 2020
Optimizing the parton shower model in PYTHIA with pp collision data at √s = 13 TeV journal November 2019
Search for Charged Higgs Bosons Produced via Vector Boson Fusion and Decaying into a Pair of W and Z Bosons Using pp Collisions at √s=13  TeV text January 2017
Measurement of the Splitting Function in pp and Pb-Pb Collisions at √sNN=5.02  TeV text January 2018
Observation of Top Quark Production in Proton-Nucleus Collisions text January 2017
Search for dark matter and unparticles in events with a Z boson and missing transverse momentum in proton-proton collisions at $\sqrt{s} = 13$ TeV text January 2017
Search for dark matter in proton-proton collisions at 8 TeV with missing transverse momentum and vector boson tagged jets text January 2016
Searches for W′ bosons decaying to a top quark and a bottom quark in proton-proton collisions at 13 TeV text January 2017
Inclusive search for a highly boosted Higgs boson decaying to a bottom quark-antiquark pair text January 2018
Search for physics beyond the standard model in events with overlapping photons and jets text January 2019
Search for pair production of vectorlike quarks in the fully hadronic final state text January 2019
Identification of heavy, energetic, hadronically decaying particles using machine-learning techniques text January 2020
Jet Structure Studies in Small Systems journal May 2019
Search for R-parity violating supersymmetry with displaced vertices in proton-proton collisions at √s = 8 TeV text January 2017
Study of Jet Quenching with Z+jet Correlations in Pb-Pb and pp Collisions at √sNN=5.02 TeV text January 2017
Elliptic Flow of Charm and Strange Hadrons in High-Multiplicity p+Pb Collisions at √sNN=8.16  TeV text January 2018
Constraints on models of scalar and vector leptoquarks decaying to a quark and a neutrino at √s =13 TeV text January 2018
Search for Pair-Produced Resonances Each Decaying into at Least Four Quarks in Proton-Proton Collisions at s =13 TeV text January 2018
Measurement of jet substructure observables in t¯t events from proton-proton collisions at √s=13 TeV text January 2018
Search for Leptoquarks Coupled to Third-Generation Quarks in Proton-Proton Collisions at √s =13 TeV text January 2018
Search for low-mass resonances decaying into bottom quark-antiquark pairs in proton-proton collisions at √s=13 TeV text January 2018
Strange hadron production in pp and pPb collisions at sNN =5.02 TeV text January 2020
Search for dark matter in proton-proton collisions at 8 TeV with missing transverse momentum and vector boson tagged jets text January 2016
Search for electroweak production of a vector-like quark decaying to a top quark and a Higgs boson using boosted topologies in fully hadronic final states text January 2017
Measurement of the B± Meson Nuclear Modification Factor in Pb-Pb Collisions at √sNN=5.02 TeV text January 2017
Search for Narrow Resonances in the b-Tagged Dijet Mass Spectrum in Proton-Proton Collisions at √s 8 TeV text January 2018
Search for long-lived particles decaying into displaced jets in proton-proton collisions at √s 13 TeV text January 2019
Measurement of the top quark polarization and t¯t spin correlations using dilepton final states in proton-proton collisions at √s=13 TeV text January 2019
Measurement of charged pion, kaon, and proton production in proton-proton collisions at √s = 13 TeV text January 2017

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