Search for heavy Higgs bosons with flavour-violating couplings in multi-lepton plus b-jets final states in pp collisions at 13 TeV with the ATLAS detector

Beck, H.P.; Chatterjee, M.; Halser, L.; Haug, S.; Mobius, S.; Müller, R.; O'Neill, A.P.; Schefer, M.M.; Weber, M.S. (2023). Search for heavy Higgs bosons with flavour-violating couplings in multi-lepton plus b-jets final states in pp collisions at 13 TeV with the ATLAS detector. Journal of High Energy Physics, 2023(12) Springer 10.1007/JHEP12(2023)081

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A search for new heavy scalars with flavour-violating decays in final states with multiple leptons and b-tagged jets is presented. The results are interpreted in terms of a general two-Higgs-doublet model involving an additional scalar with couplings to the top-quark and the three up-type quarks (ρtt, ρtc, and ρtu). The targeted signals lead to final states with either a same-sign top-quark pair, three top-quarks, or four top-quarks. The search is based on a data sample of proton-proton collisions at √s = 13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb−1. Events are categorised depending on the multiplicity of light charged leptons (electrons or muons), total lepton charge, and a deep-neural-network output to enhance the purity of each of the signals. Masses of an additional scalar boson mH between 200 − 630 GeV with couplings ρtt = 0.4, ρtc = 0.2, and ρtu = 0.2 are excluded at 95% confidence level. Additional interpretations are provided in models of R-parity violating supersymmetry, motivated by the recent flavour and (g − 2)μ anomalies.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)

UniBE Contributor:

Beck, Hans Peter, Chatterjee, Meghranjana, Halser, Lea, Haug, Sigve, Möbius, Silke, Müller, Roman, O'Neill, Aaron Paul, Schefer, Meinrad Moritz, Weber, Michele

Subjects:

500 Science > 530 Physics

ISSN:

1029-8479

Publisher:

Springer

Language:

English

Submitter:

BORIS Import LHEP

Date Deposited:

31 Jan 2024 15:49

Last Modified:

30 Jun 2024 02:19

Publisher DOI:

10.1007/JHEP12(2023)081

Additional Information:

Kollaboration - Es sind nur die Berner Autor*innen namentlich erwaehnt; the ATLAS collaboration

Uncontrolled Keywords:

Beyond Standard Model, Exotics, Hadron-Hadron Scattering

BORIS DOI:

10.48350/191811

URI:

https://boris.unibe.ch/id/eprint/191811

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