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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 root s=13TeV

Title
Search for standard model production of four top quarks with same-sign and multilepton final states in proton-proton collisions at root s=13TeV
Author
김태정
Keywords
INVARIANT; EXTENSION; DECAY
Issue Date
2018-02
Publisher
SPRINGER
Citation
EUROPEAN PHYSICAL JOURNAL C, v. 78, no. 2, Article no. 140
Abstract
A search for standard model production of four top quarks (t (t) over bart (t) over bar) is reported using events containing at least three leptons (e, mu) or a same-sign lepton pair. The events are produced in proton-proton collisions at a center-of-mass energy of 13 TeVat the LHC, and the data sample, recorded in 2016, corresponds to an integrated luminosity of 35.9 fb(-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) over bart (t) over bar cross section ismeasured to be 16.9(-11.4)(+13.8) fb, 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.
URI
https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-018-5607-5https://repository.hanyang.ac.kr/handle/20.500.11754/117458
ISSN
1434-6044; 1434-6052
DOI
10.1140/epjc/s10052-018-5607-5
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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