Author
Tumasyan, A., Işıldak, Bora
Publication Date
2022-02-21
Publication Place
-
Springer
Subject
B Physics, Flavour changing neutral currents, Hadron-hadron scattering, Higgs physics, Top physics
Type
Periodical
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
1029-8479
Record ID
21d96189-324c-4457-9f08-daad7eb37c75
Library Location
Natural and Mathematical Sciences
Date
2022-02-21
Sample Text
A search for flavor-changing neutral current interactions of the top quark (t) and the Higgs boson (H) is presented. The search is based on a data sample corresponding to an integrated luminosity of 137 fb−1 recorded by the CMS experiment at the LHC in proton-proton collisions at s = 13 TeV. Events containing exactly one lepton (muon or electron) and at least three jets, among which at least two are identified as originating from the hadronization of a bottom quark, are analyzed. A set of deep neural networks is used for kinematic event reconstruction, while boosted decision trees distinguish the signal from the background events. No significant excess over the background predictions is observed, and upper limits on the signal production cross sections are extracted. These limits are interpreted in terms of top quark decay branching fractions (B) to the Higgs boson and an up (u) or a charm quark (c). Assuming one nonvanishing extra coupling at a time, the observed (expected) upper limits at 95% confidence level are B(t → Hu) < 0.079 (0.11)% and B(t → Hc) < 0.094 (0.086)%. [Figure not available: see fulltext.].
DOI
10.1007/JHEP02(2022)169
