Abstract: The talk will focus on searches for heavy resonances decaying into a pair of Higgs bosons predicted by beyond the Standard Model theories. The search targets final states where one Higgs boson decays into a pair of tau leptons and the other into a pair of bottom quarks: X→HH→bb ττ. The analysis uses proton–proton collision data at a center-of-mass energy of 13.6 TeV, collected with the Compact Muon Solenoid experiment at the Large Hadron Collider during Run 3 (2022–2026). These final states are particularly challenging because, for heavy resonances, the Higgs bosons are produced with large Lorentz boosts. As a result, their decay products are separated by a small angle in space and appear highly collimated in the detector. Due to this collimation, a single large-cone (AK8) jet is used to reconstruct the H→bb decay. For the H→ττ decay, the tau-lepton pair is also highly boosted and collimated. Depending on the event topology, the Taus may be reconstructed either within a single large jet or as two isolated tau leptons. The search is performed by scanning the distribution of the reconstructed resonance mass and looking for a local excess in data compared to the background prediction.