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W+W- boson pair production in proton-proton collisions at ?s =13 TeV

Abstract: A measurement of the W+W? boson pair production cross section in proton-proton collisions at ?s=13?TeV is presented. The data used in this study are collected with the CMS detector at the CERN LHC and correspond to an integrated luminosity of 35.9?fb-1. The W+W- candidate events are selected by requiring two oppositely charged leptons (electrons or muons). Two methods for reducing background contributions are employed. In the first one, a sequence of requirements on kinematic quantities is applied allowing a measurement of the total production cross section, 117.6±6.8?pb, which agrees well with the theoretical prediction. Fiducial cross sections are also reported for events with zero or one jet, and the change in the zero-jet fiducial cross section with the jet transverse momentum threshold is measured. Normalized differential cross sections are reported within the fiducial region. A second method for suppressing background contributions employs two random forest classifiers. The analysis based on this method includes a measurement of the total production cross section and also a measurement of the normalized jet multiplicity distribution in W+W- events. Finally, a dilepton invariant mass distribution is used to probe for physics beyond the standard model in the context of an effective field theory, and constraints on the presence of dimension-6 operators are derived.

 Fuente: Phys. Rev. D, 102 092001 (2020)

 Editorial: American Physical Society

 Fecha de publicación: 01/11/2020

 Nº de páginas: 30

 Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevD.102.092001

 ISSN: 1550-7998,1550-2368,2470-0010,2470-0029

 Url de la publicación: https://doi.org/10.1103/PhysRevD.102.092001