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Search for standard model production of four top quarks with same-sign and multilepton final states in proton?proton collisions at ?s=13TeV

Abstract: A search for standard model production of four top quarks (t t ¯ t t ¯) is reported using events containing at least three leptons (e , ?) or a same-sign lepton pair. The events are produced in proton?proton collisions at a center-of-mass energy of 13TeV at the LHC, and the data sample, recorded in 2016, corresponds to an integrated luminosity of 35.9fb-1. Jet multiplicity and flavor are used to enhance signal sensitivity, and dedicated control regions are used to constrain the dominant backgrounds. The observed and expected signal significances are, respectively, 1.6 and 1.0 standard deviations, and the t t ¯ t t ¯ cross section is measured to be 16.9-11.4+13.8fb, in agreement with next-to-leading-order standard model predictions. These results are also used to constrain the Yukawa coupling between the top quark and the Higgs boson to be less than 2.1 times its expected standard model value at 95% confidence level.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: European Physical Journal C, Vol. 78, Iss. 2, Art. Num. 140 (2018)

Editorial: Springer New York LLC

 Fecha de publicación: 19/02/2018

Nº de páginas: 24

Tipo de publicación: Artículo de Revista

 DOI: 10.1140/epjc/s10052-018-5607-5

ISSN: 1434-6044,1434-6052

Url de la publicación: https://doi.org/10.1140/epjc/s10052-018-5607-5