Measurement of colour flow using jet-pull observables in t t ¯ events with the ATLAS experiment at s = 13 TeV

. 2018 ; 78 (10) : 847. [epub] 20181022

Status PubMed-not-MEDLINE Jazyk angličtina Země Francie Médium print-electronic

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/pmid30934029

Previous studies have shown that weighted angular moments derived from jet constituents encode the colour connections between partons that seed the jets. This paper presents measurements of two such distributions, the jet-pull angle and jet-pull magnitude, both of which are derived from the jet-pull angular moment. The measurement is performed in t t ¯ events with one leptonically decaying W boson and one hadronically decaying W boson, using 36.1 fb - 1 of pp collision data recorded by the ATLAS detector at s = 13 TeV delivered by the Large Hadron Collider. The observables are measured for two dijet systems, corresponding to the colour-connected daughters of the W boson and the two b-jets from the top-quark decays, which are not expected to be colour connected. To allow the comparison of the measured distributions to colour model predictions, the measured distributions are unfolded to particle level, after correcting for experimental effects introduced by the detector. While good agreement can be found for some combinations of predictions and observables, none of the predictions describes the data well across all observables.

2 Physikalisches Institut Georg August Universität Göttingen Göttingen Germany

2 Physikalisches Institut Justus Liebig Universität Giessen Giessen Germany

Academia Sinica Grid Computing Institute of Physics Academia Sinica Taipei Taiwan

Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Bern Switzerland

B 1 Stepanov Institute of Physics National Academy of Sciences of Belarus Minsk Belarus

Bahcesehir University Faculty of Engineering and Natural Sciences Istanbul Turkey

Budker Institute of Nuclear Physics SB RAS Novosibirsk Russia

Cavendish Laboratory University of Cambridge Cambridge UK

Center for High Energy Physics University of Oregon Eugene OR USA

Centre de Calcul de l'Institut National de Physique Nucléaire et de Physique des Particules Villeurbanne France

Centro de Física Nuclear da Universidade de Lisboa Lisbon Portugal

Centro de Investigaciónes Universidad Antonio Nariño Bogota Colombia

CERN Geneva Switzerland

CPPM Aix Marseille Université CNRS IN2P3 Marseille France

Czech Technical University Prague Prague Czech Republic

D 5 Skobeltsyn Institute of Nuclear Physics M 5 Lomonosov Moscow State University Moscow Russia

Departamento de Engenharia Elétrica Universidade Federal de Juiz de Fora Juiz de Fora Brazil

Departamento de Física Faculdade de Ciências Universidade de Lisboa Lisbon Portugal

Departamento de Física Pontificia Universidad Católica de Chile Santiago Chile

Departamento de Física Teorica C 15 and CIAFF Universidad Autónoma de Madrid Madrid Spain

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Fakultät für Mathematik und Naturwissenschaften Fachgruppe Physik Bergische Universität Wuppertal Wuppertal Germany

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