Abstract
We use the current \( t\overline{t} \) experimental analysis to look for Dark Matter (DM) particles hidden in the final state. We present a phenomenological study where we successfully perform the reconstruction of a \( t\overline{t} \) system in the presence of a scalar mediator Y0, that couples to both Standard Model (SM) and to DM particles. We use a MadGraph5_aMC@NLO simplified DM model, where signal samples of pp → \( t\overline{t}Y \)0 are generated at the Large Hadron Collider (LHC) with both Charge-Parity (CP) -even and CP-odd couplings of Y0 to the top quarks. Different mass scales for the Y0 mediator are considered, from the low mass region (~ 0 GeV) to masses close to the Higgs boson mass (125 GeV). The dileptonic final states of the \( t\overline{t} \) system were used in our analysis. The reconstruction of the \( t\overline{t} \) system is done with a kinematic fit, without reconstructing the mediator. All relevant SM backgrounds for the dileptonic \( t\overline{t} \) search at the LHC are considered. Furthermore, CP angular observables were used to probe the CP-nature of the coupling between the mediator and top-quarks, which allowed to set confidence level (CL) limits for those Yukawa couplings as a function of the mediator mass.
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Acknowledgments
R.C. and R.S. are partially supported by the Portuguese Foundation for Science and Technology (FCT) under Contracts no. UIDB/00618/2020, UIDP/00618/2020, CERN/FIS-PAR/0025/2021 CERN/FIS-PAR/0010/2021 and CERN/FIS-PAR/0021/2021. R.C. is additionally supported by FCT Grant No. 2020.08221.BD. A.O. is partially supported by FCT, under the Contract CERN/FIS-PAR/0037/2021. D.A. is supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under grant 396021762 – TRR 257.
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Azevedo, D., Capucha, R., Chaves, P. et al. Search for an invisible scalar in \( t\overline{t} \) final states at the LHC. J. High Energ. Phys. 2023, 125 (2023). https://doi.org/10.1007/JHEP11(2023)125
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DOI: https://doi.org/10.1007/JHEP11(2023)125