In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2018, No. 12 ( 2018-12)
Abstract:
A search for new phenomena in events with two same-charge leptons or three leptons and jets identified as originating from b -quarks in a data sample of 36.1 fb −1 of pp collisions at $$ \sqrt{s}=13 $$ s = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider is reported. No significant excess is found and limits are set on vector-like quark, four-top-quark, and same-sign top-quark pair production. The observed (expected) 95% CL mass limits for a vector-like T - and B -quark singlet are m T 〉 0.98 (0.99) TeV and m B 〉 1.00 (1.01) TeV respectively. Limits on the production of the vector-like T 5/3 -quark are also derived considering both pair and single production; in the former case the lower limit on the mass of the T 5/3 -quark is (expected to be) 1.19 (1.21) TeV. The Standard Model four-top-quark production cross-section upper limit is (expected to be) 69 (29) fb. Constraints are also set on exotic four-top-quark production models. Finally, limits are set on same-sign top-quark pair production. The upper limit on uu → tt production is (expected to be) 89 (59) fb for a mediator mass of 1 TeV, and a dark-matter interpretation is also derived, excluding a mediator of 3 TeV with a dark-sector coupling of 1.0 and a coupling to ordinary matter above 0.31.
Type of Medium:
Online Resource
ISSN:
1029-8479
DOI:
10.1007/JHEP12(2018)039
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2018
detail.hit.zdb_id:
2027350-2
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