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Accès ouvert déclaré 2019 article

Measurement of $\\mathrm{t\\bar t}$ normalised multi-differential cross sections in pp collisions at $\\sqrt s=13$ TeV, and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functions

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51Institutions déclarées
18Pays d’affiliation déclarés

Résumé fourni par la source

Normalised multi-differential cross sections for top quark pair ($\\mathrm{t\\overline{t}}$) production are measured in proton-proton collisions at a centre-of-mass energy of 13 TeV using events containing two oppositely charged leptons. The analysed data were recorded with the CMS detector in 2016 and correspond to an integrated luminosity of 35.9 fb$^{-1}$. The double-differential $\\mathrm{t\\overline{t}}$ cross section is measured as a function of the kinematic properties of the top quark and of the $\\mathrm{t\\overline{t}}$ system at parton level in the full phase space. A triple-differential measurement is performed as a function of the invariant mass and rapidity of the $\\mathrm{t\\overline{t}}$ system and the multiplicity of additional jets at particle level. The data are compared to predictions of Monte Carlo event generators that complement next-to-leading-order (NLO) quantum chromodynamics (QCD) calculations with parton showers. Together with a fixed-order NLO QCD calculation, the triple-differential measurement is used to extract values of the strong coupling strength $\\alpha_S$ and the top quark pole mass ($m_\\mathrm{T}^\\text{pole}$) using several sets of parton distribution functions (PDFs). Furthermore, a simultaneous fit of the PDFs, $\\alpha_S$, and $m_\\mathrm{T}^\\text{pole}$ is performed at NLO, demonstrating that the new data have significant impact on the gluon PDF, and at the same time allow an accurate determination of $\\alpha_S$ and $m_\\mathrm{T}^\\text{pole}$.

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Institutions déclarées

A. Alikhanyan National LaboratoryInstitute of High Energy PhysicsCentro Brasileiro de Pesquisas FísicasUCLouvainUniversidade Federal do ABCBeihang UniversityGhent University HospitalInstitut de Recherche sur les Lois Fondamentales de l'UniversUniversidade do Estado do Rio de JaneiroUniversidade Federal do Estado do Rio de JaneiroUniversidade PaulistaUniversidade Estadual Paulista (Unesp)United Institute of Informatics ProblemsInstitute of Applied PhysicsLaboratoire Leprince-RinguetUniversité de Haute-AlsaceInstitut Pluridisciplinaire Hubert CurienPeking UniversityCentre de Calcul de l’Institut National de Physique Nucléaire et de Physique des ParticulesInstitute of Nuclear Physics of LyonRWTH Aachen UniversityInstitute for Nuclear Research and Nuclear EnergySofia University "St. Kliment Ohridski"Institute of High Energy PhysicsTsinghua UniversityUniversidad de Los AndesUniversidad de AntioquiaRuđer Bošković InstituteUniversity of SplitUniversity of CyprusEgyptian Universities NetworkCharles UniversityAcademy of Scientific Research and TechnologyNational Institute of Chemical Physics and BiophysicsUniversidad San Francisco de QuitoUniversity of HelsinkiHelsinki Institute of PhysicsLappeenranta-Lahti University of TechnologyCentre National de la Recherche ScientifiqueÉcole PolytechniqueUniversité Paris-SaclayCommissariat à l'Énergie Atomique et aux Énergies AlternativesCEA Paris-SaclayUniversité de StrasbourgUniversity of AntwerpGeorgian Technical UniversityLyon 1 UniversitéVrije Universiteit BrusselDeutsches Elektronen-Synchrotron DESYUniversität HamburgUniversité Libre de Bruxelles

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Sujets associés

Particle physics theoretical and experimental studiesHigh-Energy Particle Collisions ResearchQuantum Chromodynamics and Particle Interactions

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