Search For Standard Model Production Of Four Top Quarks With Same-Sign And Multilepton Final States İn Proton–Proton Collisions At s?=13TeV
Yükleniyor...
Tarih
2018
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer Link
Erişim Hakkı
Özet
A search for standard model production of four top quarks (tt¯tt¯tt¯tt¯) is reported using events containing at least three leptons (e,?e,?) or a same-sign lepton pair. The events are produced in proton–proton collisions at a center-of-mass energy of 13TeVTeV at the LHC, and the data sample, recorded in 2016, corresponds to an integrated luminosity of 35.9fb?1fb?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 tt¯tt¯tt¯tt¯ cross section is measured to be 16.9+13.8?11.416.9?11.4+13.8 fbfb, 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
Açıklama
Anahtar Kelimeler
Standard model, Higgs boson
Kaynak
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
