Search for t(t)over-barH/A → t(t)over-bart(t)over-bar production in the multilepton final state in proton-proton collisions at √s=13 TeV with the ATLAS detector
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F23%3A73621756" target="_blank" >RIV/61989592:15310/23:73621756 - isvavai.cz</a>
Result on the web
<a href="https://link.springer.com/article/10.1007/JHEP07(2023)203" target="_blank" >https://link.springer.com/article/10.1007/JHEP07(2023)203</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/JHEP07(2023)203" target="_blank" >10.1007/JHEP07(2023)203</a>
Alternative languages
Result language
angličtina
Original language name
Search for t(t)over-barH/A → t(t)over-bart(t)over-bar production in the multilepton final state in proton-proton collisions at √s=13 TeV with the ATLAS detector
Original language description
A search for a new heavy scalar or pseudo-scalar Higgs boson (H/A) produced in association with a pair of top quarks, with the Higgs boson decaying into a pair of top quarks (H/A -> t (t) over bar) is reported. The search targets a final state with exactly two leptons with same-sign electric charges or at least three leptons. The analysed dataset corresponds to an integrated luminosity of 139 fb(-1) of proton-proton collisions collected at a centre-of-mass energy of 13TeV with the ATLAS detector at the LHC. Two multivariate classifiers are used to separate the signal from the background. No significant excess of events over the Standard Model expectation is observed. The results are interpreted in the context of a type-II two-Higgs-doublet model. The observed (expected) upper limits at 95% confidence level on the t (t) over barH/A production cross-section times the branching ratio of H/A -> t (t) over bar range between 14 (10) fb and 6 (5) fb for a heavy Higgs boson with mass between 400 GeV and 1000 GeV, respectively. Assuming that only one particle, either the scalar H or the pseudo-scalar A, contributes to the t (t) over bart (t) over bar final state, values of tan beta below 1.2 or 0.5 are excluded for a mass of 400 GeV or 1000 GeV, respectively. These exclusion ranges increase to tan beta below 1.6 or 0.6 when both particles are considered.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
JOURNAL OF HIGH ENERGY PHYSICS
ISSN
1029-8479
e-ISSN
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Volume of the periodical
2023
Issue of the periodical within the volume
7
Country of publishing house
IT - ITALY
Number of pages
53
Pages from-to
"203-1"-"203-53"
UT code for WoS article
001062358200001
EID of the result in the Scopus database
2-s2.0-85167601349