Llanes Estrada, Felipe José2025-07-152025-07-152025-07Llanes-Estrada, F.J. Ensuring That Toponium Is Glued, Not Nailed. Physics Letters B 2025, 866, 139510, doi:10.1016/j.physletb.2025.1395100370-269310.1016/j.physletb.2025.139510https://hdl.handle.net/20.500.14352/122549PRX23/00225Hints of toponium might be incipient in LHC data, as given the vast numbers of t quarks produced, some survive on the exponential-decay tail long enough to fasten together. I here discuss a few differences between the standard Quantum Chromodynamics (QCD) binding (the “glue”) and exotic short-range binding (the “nail”). If the binding energy below threshold reaches the 3 GeV range the peak of the is distinct enough that a cross-section dip should be apparent in the line shape, should there only be one isolated resonance, but is filled by the excited QCD states adding about a pbarn to the cross section of production. Their effect for smaller binding energies is a tenuous increase in the cross section. A new-physics short-range interaction, on the other hand, yields a larger cross-section for equal binding energy (or hardly a visible bound state for similar cross section). This is due to its larger relative wavefunction at small distances. Finally, assuming that standard QCD plays out, I comment on what size of constraints on new-physics coefficients one can expect at given precision.engAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/journal articlehttps://doi.org/10.1016/j.physletb.2025.139510https://www.sciencedirect.com/science/article/pii/S0370269325002710open access53ToponiumTop-antitop bound stateResonance lineshapeContact interactionsHEFTProduction cross sectionFísica (Física)22 Física