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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)
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, Vol. 76, Issue 3; ISSN 1434-6044
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 509 works
Citation information provided by
Web of Science

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