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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 (pppp) data at s?=7TeVs=7TeVand to UE proton?antiproton (pp¯¯¯pp¯) data from the CDF experiment at lower s?s, are used to study the UE models and constrain their parameters, providing thereby improved predictions for proton?proton collisions at 13TeVTeV. 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 (qq¯¯¯?Z/???qq¯?Z/??? lepton-antilepton+jets) observables at 7 and 8TeVTeV, as well as predictions for MB and UE observables at 13TeVTeV.
Fuente: European Physical Journal C, Vol. 76, Num. 3, Art. Num. 155, (2016)
Publisher: Springer New York LLC
Publication date: 01/03/2016
No. of pages: 52
Publication type: Article
DOI: 10.1140/epjc/s10052-016-3988-x
ISSN: 1434-6044,1434-6052
Publication Url: https://doi.org/10.1140/epjc/s10052-016-3988-x
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KHACHATRYAN, VLADIMIR
JOSE IBAN CABRILLO BARTOLOME
ALICIA CALDERON TAZON
JUAN RAMON CASTIÑEIRAS DE SAA
PABLO DE CASTRO MANZANO
MARCOS FERNANDEZ GARCIA
JUAN GARCIA FERRERO
GERVASIO GOMEZ GRAMUGLIO
MARIA AMPARO LOPEZ VIRTO
JESUS MARCO DE LUCAS
RAFAEL JOSE MARCO DE LUCAS
CELSO MARTINEZ RIVERO
FRANCISCO MATORRAS WEINIG
JONATAN PIEDRA GOMEZ
MARIA TERESA RODRIGO ANORO
ANA YAIZA RODRIGUEZ MARRERO
ALBERTO RUIZ JIMENO
LUCA SCODELLARO
NICOLO TREVISANI
IVAN VILA ALVAREZ
ROCIO VILAR CORTABITARTE
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