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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
(SPRINGER, 2023/12/12) Aad G.; Abbott B.; Abeling K.; Abicht N. J.; Abidi S. H.; Aboulhorma A.; Abramowicz H.; Abreu H.; Abulaiti Y.; Abusleme Hofman A. C.; Acharya B. S.; Bourdarios C. Adam; Adamczyk L.; Adamek L.; Addepalli S. V; Addison M. J.; Adelman J.; Adiguzel A.; Adye T.; Afolder A. A.; Afk Y.; Agaras M. N.; Agarwala J.; Aggarwal A.; Agheorghiesei C.; Ahmad A.; Ahmadov F.; Ahmed W. S.; Ahuja S.; Ai X.; Aielli G.; Tamlihat M. Ait; Aitbenchikh B.; Aizenberg I; Akbiyik M.; Akesson T. P. A.; Akimov A. V; Akiyama D.; Akolkar N. N.; Al Khoury K.
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 (rho(tt),rho(tc), and rho(tu)). 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 root s = 13TeV 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 rho(tt) = 0.4, rho(tc) = 0.2, and rho(tu) = 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) (mu) anomalies.